RICKARD, L. G., E. P. HOBERG, J. K. Bishop, and G. L. Zimmerman. Epizootiology of Nematodirus battus, N. filicollis, and N. spathiger (Nematoda: Trichostrongyloidea) in western Oregon . . . 104
BOAG, B. and H. H. KOLB. Influence of host age and sex on nematode populations in the wild rabbit (Oryctolagus cuniculus L.) . . . 116
POINAR, G. O. Jr., A. G. CHABAUD, and O. BAIN. Rabbium paradoxus sp. n. (Seuratidae: Skrjabinelaziinae) maturing in Camponotus castaneus (Hymenoptera: Formicidae) . . . . . 120
JARA, C. A. and D. K. CONE. Scleroductus yuncensi gen. et sp. n. (Monogenea) from Pimelodella yuncensis (Siluriformes: Pimelodidae) in Peru . . . . . 125
KRITSKY, D. C., V. E. THATCHER, and W. A. BOEGER. Neotropical Monogenea. 15. Dactylogyrids from the gills of Brazilian Cichlidae with proposal of Sciadicleithrum gen.n. (Dactylogyridae) . . . . . 128
DUNAGAN, T. T. and R.-M. RASHED. A vaginal ganglion in female Echinopardalis atrata (Acanthocephala) . . . . . 141
HASEGAWA, H. Neoentomelas asatoi gen. et sp. n. (Nematoda: Hedruridae) from skinks of the Ryukyu Archipelago, Japan . . . . 145
MARCOGLIESE, D. J. and G. W. ESCH. Experimental and natural infections of planktonic and benthic copepods by the Asian tapeworm, Bothriocephalus acheilognathi . . . . . 151
HOLMES, J. C. A redescription of Simhatrema simhai Chattopadhyaya, 1970 (Trematoda: Exotidendriidae), with comments on its pathogenesis in sea snakes (Serpentes: Hydrophiidae) . . . . 156
McALLISTER, C. T., S. J. UPTON, and D. B. CONN. A comparative study of endoparasites in three species of sympatric Bufo (Anura: Bufonidae), from Texas . . . . . 162
FRIED, B. and S. KIM. In Vitro cultivation of Echinostoma revolutum (Trematoda) metacercariae in an extract of chick mucosal epithelium . . . . 168
LICHTENFELS, J. R. and P. A. PILITT. Cuticular ridge patterns of Marshallagia marshalli and Ostertagia occidentalis (Nematoda: Trichostrongyloidea) parasitic in ruminants of North America . . . 173
KRECEK, R. C. Habronema malani sp. n. and Habronema tomasi sp. n. (Nematoda: Habronematidae) from the Burchell's zebras and Hartmann's mountain zebras in southern Africa . . . . . 183
OBAIBO, A. B., N. Ø CHRISTENSEN, and F. M. A. UKOLI. Further studies on the population regulation in Echinostoma caproni infections in NMRI mice . . . . 192
CANALS, A. and L. C. GASBARRE. Procedure for the recovery of excretory-secretory products from molting fourth-stage larvae of Ostertagia ostertagi . . . . . 201
SEVILLE, R. S. and E. S. WILLIAMS. Endoparasites of the white-tailed prairie dog, Cynomys leucurus at Meeteetse, Park County, Wyoming . . . 204
BLAGBURN, B. L., K. G. BRAUND, K. A. AMLING, and M. TOIVIO-KINNUCAN. Muscular Sarcocystis in a dog . . . . 207
PEARLSTEIN, K. T., M. A. POEHLMAN, and G. D. INSLER. The growth of Hymenolepis diminuta in five strains of mice . . . . 210
JOY, J. E. Lintaxine cokeri (Monogenea: Microcotylidae) on freshwater drum in the Kanawha River, West Virginia . . . 213