LUTTERSCHMIDT, W. I., J. F. SCHAEFFER, and R. A. FIORILLO. The Ecological Significance of Helminth Endoparasites on the Physiological Performance of Two Sympatric Fishes . . . . . 194
ROSAS-VALDEZ, R., O. DOMÍNGUEZ-DOMÍNGUEZ, A. CHOUDHURY, and G. PÉREZ-PONCE DE LEÓN. Helminth Parasites of the Balsas Catfish Ictalurus balsanus (Siluriformes: Ictaluridae) in Several Localities of the Balsas River Drainage, Mexico: Species Composition and Biogeographical Affinities . . . . . 204
CARRENO, R. A. Description of a new species of Thelastoma Leidy, 1849 (Nematoda: Oxyurida: Thelastomatidae) from the Millipede Euryurus leachii (Gray, 1832) in Ohip, U.S.A. . . . . . 211
CAMPBELL, R. A. and I. BEVERIDGE. A New Species and New Records of Parachristianella Dollfus, 1946 (Cestoda: Trypanorhyncha) from the Gulf of Calfornia, Mexico . . . . . 218
DAILEY, M. D. A New Species of Digenea (Trematoda: Brachycladiidae) from the Gervais' Beaked Whale, Mesoplodon europaeus, with Comments on Other Cetacean Liver Flukes . . . . . . 229
FLORES, V. R., N. BRUGNI, and C. A. RAUQUE. Redescription of Hippocrepis myocastoris Babero, Cabello et Kinoed, 1979 (Digenea: Notocotylidae), in the Coypu Myocastor couypus (Rodentia: Myocastoridae) from Patagonia, Argentina . . . . . 233
SMALES, L. R. Oligocanthorhynchidae (Acanthocephala) from Mammals of Paraguay with the Description of a New Species of Neoncicola . . . . . . 237
AMIN, O. M., K. NAGASAWA, and M. J. GRYGIER. Host and Seasonal Distribution of Fish Acanthocephalans from the Lake Biwa Basin, Japan . . . . . 244
BARTON, D. P. Pentastomid Parasites of the Introduced Asian House Gecko, Hemidactylus frenatus (Gekkonidae), in Australia . . . . . 254
TRIPATHI, A., N. AGRAWAL, and K. C. PANDY. A Monogenoid from the Gills of Freshwater Garfish, Xenentodon cancila (Teleostei: Beloniformes: Belonidae) in India, with Proposal of Xenentocleidus n. g. (Monogenoidea: Dactylogyridae) . . . . . 260
PAOLO, G., G. STRONA, F. BENZONI, G. CROSA, and F. STEFANI. Monogenoids from Freshwater Fish in Italy, with Comments on Alien Species . . . . . 264
CLOPTON, R. E., T. J. COOK, and J. L. COOK. Revision of Geneiorhynchus Schneider, 1975 (Apicomplexa: Eugregarinida: Actinocephalidae: Acanthosporinae) with Recognition of Four New Species of Geneiorhynchus and Description of Geneiorhynchus manifestus n. sp. Parasitizing Naiads of the Green Darner, Anax junius (Odonata: Aeshnidae) in the Texas Big Thicket . . . . . 273
HAYS, J. J., R. E. CLOPTON, T. J. COOK, and J. L. COOK. Revision of the Genus Nubenocephalus and Description of Nubenocephalus secundus n. sp. (Apicomplexa: Actinocephalidae) Parasitizing Adults of Argia sedula (Odonata: Zygoptera: Coenagrionidae) in the Primitive Texas Big Thicket, U.S.A. . . . . . 286
DUSZYNSKI, D. W., A. J. LYNCH, and J. A. COOK. Coccidia (Apicomplexa: Eimeriidae) Infecting Cricetid Rodents from Alaska, U.S.A., and Northeastern Siberia, Russia, and Description of a New Eimeria species from Myodes rutilus, and the Northern Red-Backed Vole . . . . . 294
PETERAON, N. A. Seasonal Prevalence of Ribeiroia ondatrae in One Population of Planorbella trivolvis (=Helisoma trivolvis), Including Notes on the Larval Trematode Component Community . . . . . 312
BOURGEOIS, A.-C., K. C. KOSKI, and M. E. SCOTT. Comparative Sensitivity of Feeding and Nonfeeding Stages of Heligmosomoides bakeri (Nematoda) to Boron. . . . . 319
GOLDBERG, S. R., C. R. BURSEY, J. P. CALDWELL, L. J. VITT, and G. C. COSTA. Gastrointestinal Helminths from Six Species of Frogs and Three Species of Lizards, Sympatric in Pará State, Brazil . . . . . 327
YILDIRIMHAN, H. S., C. R. BURSEY, and S. R. GOLDBERG. Helminth Parasites of the Grass Snake, Natrix natrix, and the Dice Snake, Natrix tessellata (Serpentes: Colubridae) from Turkey . . . . . 343
RESEARCH NOTES
ROBINSON, H. A. and M. A. BARGER. Microhabitat Specificity of Paulisentis missouriensis (Acanthocephala) in Creek Chub (Semotilus atromaculatus) in Southeastern Nebraska . . . . . 355
DIDYK, A. S., A. G. CANARIS and J. M. KINSELLA. Intestinal Helminths of the Spotted Sandpiper, Actitis macularius (L.), During Fall Migration in New Brunswick, Canada, with a Checklist of Helminths Reported from this Host . . . . . 359
DIDYK, A. S., J. M. KINSELLA, and A. G. CANARIS. Intestinal Helminths of the Fall Migrating Ruddy Turnstones, Arenaria interpres (L.), from New Brunswick, Canada, with a Checklist of Helminths Reported from this Host . . . . . 364
DICK, C. W., D. GETTINGER, and S. L. GARDNER. Bolivian Ectoparasites: A Survey of Bats (Mammalia: Chiroptera) . . . . . 372
FENNER, A. L. and C. M. BULL. Bothriocroton hydrosauri (Formerly: Aponomma hydrosauri) (Denny, 1843) (Acari: Ixodidae), New Parasite Record for the Endangered Pygmy Bluetongue Lizard, Tiliqua adelaidensis (Sincidae) from Australia . . . . 378
MUZAFFAR, S. B., E. P. HOBERG, and I. L. JONES. First Record of Alcataenia larina larina (Cestoda: Dilepididae) in Atlantic Puffins (Aves, Alcidae, Fractercula arctica) from Newfoundland, Canada . . . . . 380
AMIN, O. M., R. HECKMANN, and M. D. STANDING. The Structural-Functional Relationship of the Para-Receptacle Structure in Acanthocephala . . . . . 383
HECKMANN, R. A., O. M. AMIN, and M. D. STANDING. Chemical Analysis of Metals in Acanthocepahans Using Energy Dispersive X-Ray Analysis (EDXA) in Conjunction with a Scanning Electron Microscope (SEM) . . . . . 388
ANNOUNCEMENTS
2007 Report on the Brayton H. Ransom Memorial Trust Fund . . . . . . 232
Anniversary Award: Ron Fayer . . . . . . . 228
Editor's Acknowledgements . . . . . . . . 392
Errata . . . . . . . 392