CRISCIONE, C. D., and W. F. FONT. Artifactual and Natural Variation of Oochoristica
javaensis: Statistical Evaluation of In
Situ-Fixation............................................................. 156
FORRESTER, D. J., G. W. FOSTER, and J. E. THUL. Blood Parasites of the Ring-necked Duck (Aythya collaris) on its
Wintering Range in Florida, U.S.A....................................... 173
CARRENO, R. A., L. A. DURDEN, D. R. BROOKS, A. ABRAMS, and E. P. HOBERG. Parelaphostrongylus tenuis
(Nematoda: Protostrongylidae) and Other Parasites of White-Tailed Deer (Odocoileus
virginianus) in Costa Rica............................. 177
JOY, J. E., and R. B. TUCKER. Cepedietta michiganensis (Protozoa) and Batracholandros magnavulvaris (Nematoda) from Plethodontid Salamanders in West Virginia, U.S.A............................................................................................. 185
AGUIRRE-MACEDO, M. L., T. SCHOLZ, D. GONZÁLES-SOLÍS, V. M. VIDAL-MARTINEZ, P. POSEL, G. ARJANO-TORRES, S. DUMAILO, and E. SIU-ESTRADA. Some Adult Endohelminths Parasitizing Freshwater Fishes from the Atlantic Drainages of Nicaragua........................................... 190
SALGADO-MALDONADO, G., G. CABAÑAS-CARRANZA, J. M. CASPETA-MANDUJANO, E. SOTO-GALERA, E. MAYÉN-PEÑA, D. BRAILOVSKY, and R. BÁEZ-VALE. Helminth Parasites of Freshwater Fishes for the Balsas River Drainage Basin of Southwestern Mexico .......................196
SALGADO-MALDONADO, G., G. CABAÑAS-CARRANZA, E. SOTO-GALERA, J. M. CASPETA-MANDUJANO,
R. G. MORENO-NAVARRATE, P. SÁANCHEZ-NAVA, R. AGUILAR-AGUILAR. A Checklist of Helminth Parasites of
Freshwater Fishes from the Lerma-Santiago River Basin,
Mexico.............................................................. 204
CURRAN, S. S., R. M. OVERSTREET, T. T. DANG, and T. L. NGUYEN. Singhiatrema vietnamensis sp. n. (Digenea: Ommatobrephidae) and Szidatia taiwanensis (Fischthal and Kuntz, 1975) comb. n. (Digenea: Cyathocotylidae) from Colubrid Snakes in Vietnam ................................. 219
KUZMIN, Y., V. V. TKACH, and S. D. SNYDER. Rhabdias ambystomae sp. n. (Nematoda: Rhabdiasidae) from the North American Spotted Salamander, Ambystoma maculatum(Amphibia: Ambystomatidae)...................................................... 228
CONE, D. K. Supplemental Diagnosis of Myxobolus gibbosus (Myxozoa), with a Taxonomic Review of Myxobolids from Lepomis gibbosus (Centrarchidae) in North America...................................... 236
GIBLIN-DAVIS, R. M., K. A. DAVIES, D. S. WILLIAMS, and T. D. CENTER. Cuticular Changes in Fergusobiid Nematodes Associated with Parasitism of Fergusoninid Flies.......................................... 242
PAOLA, A., and M. C. DAMBORENEA. Tegumentary Ultrastructure (SEM) of Preadult and Adult Lobatostoma jungwirthi Kritscher, 1974 (Trematoda: Aspidogastrea).............. 249
MULLICAN, S. K., J. E. HUFFMAN, and B. FRIED. Infectivity and Comparative Pathology of Echinostoma caproni, Echinostoma revolutum, and Echinostoma trivolvis (Trematoda) in the Domestic Chick................................ 256
FRIED, B., A. REDDY, and C. D. BALFOUR. Excystation and Distribution of Metacercariae of Echinostoma caproni in ICR Mice......................................................... 259
PHAM, S.-D., C.-L. TRAN, and H. HASEGAWA. Helminths Collected from Rattus spp. in Bac Ninh Province, Vietnam................................................................... 261
LICHTENFELS, J. R., A. McDONNELL, S. LOVE, and J. B. MATHEWS. Nematodes of the Tribe Cyathostominea (Stronylidae) Collected from Horses in Scotland................ 265
YODER, H. R., J. R. COGGINS, and J. R. CORBETT. Helminth Parasites of the Green Frog (Rana clamitans) from Southwestern Wisconsin, U.S.A................................... 269
AGUILAR-AGUILAR, R., R. G. MORENO-NAVARRETE, G. SALGADO-MALDAONADO, and B. VILLA-RAMÍREZ. Gastrointestinal Helminths of Spinner Dolphins Stenella longirostris (Gray, 1828) (Cetacea: Delphinidae) Stranded in La Paz Bay, Bajo California Sur, Mexico.............................................................................................. 272
MATEY, V. E., B. I. KUPERMAN, J. M. KINSELLA, G. F. LLOYD, and S. J. LANE. The Lung Nematodes (Metastrongyloidea) of the Virginia Opossum, Didelphis virginiana, in Southern California, U.S.A...................274
DIAZ, J. I., G. T. NAVONE, and F. CREMONTE. New Host and Distribution Records of Cosmocephalus obvelatus (Creplin, 1925) (Nematoda: Acuariidae), With Morphometric Comparisons................................................................................... .277