LICHTENFELS, J. RALPH. Differences in Cuticular Ridges Among Cooperia spp. of North American Ruminants with an Illustrated Key to Species . . . . . . 111
CAMPBELL, WILLIAM C. Can Alcoholic Beverages Provide Protection Against Trichinosis? . . . . . . 120
CHUTE, ANNE M., EVERETT E. LUND and GARY C. WILKINS. Comparative Responses of Indian Red Jungle Fowl, Light Brahma Chickens, and Three Other Galliform Birds to Experimental Infections with Histomonas meleagridis and Heterakis gallinarum . . . . . . 126
FLEMING, W. JAMES, C. F. DIXON and J. W. LOVETT. Helminth Parasites of River Otters (Lutra canadensis) from Southeastern Alabama . . . . . . 131
POWELL, EDWIN C. Ultrastructural Development of the Excretory Bladder in Early Metacercariae of Ochetosoma aniarum (Leidy, 1891) . . . . . . 136
KRITSKY, D. C., R. J. KAYTON and P. D. LEIBY. Dactylogyrus unguiformis sp. n. (Monogenea) from the Mottled Sculpin, Cottus bairdi Girard, in Idaho, with Some Taxonomic Considerations in the Genus Dactylogyrus . . . . . . 141
AUGUSTINE, P. C., J. M. VETTERLING and D. J. DORAN. Eimeria tenella: Growth Characteristics of Drug-resistant Strains in Chicks and Cell Culture . . . . . . 147
CARNEY, W. P., PURNOMO, P. F. D. VAN PEENEN, R. J. BROWN and M. SUDOMO. Schistosoma incognitum from Mammals of Central Sulawesi, Indonesia . . . . . . 150
DAVIDSON, WILLIAM R., GARY L. DOSTER, SAMUEL R. PURSGLOVE Jr. and ANNIE K. PRESTWOOD. Helminth Parasites of Ruffed Grouse (Bonasa umbellus) from the Eastern United States . . . . . . 156
SULLIVAN, JAMES J. Redescription of Choledocystus hepaticus (Lutz, 1928) n. comb., and the Status of C. linguatula (Rudolphi, 1819) (Trematoda: Plagiorchiodidea) . . . . . . 162
HUFFMAN, DAVID G. and RICHARD G. KLIEVER. Echinorhynchus canyonensis sp. n. (Acanthocephala) from Maynea californica (Osteichthyes: Zoarcidae) from the Monterey Submarine Canyon, California . . . . . . 171
CORKUM, KENNETH C. and HUGH M. TURNER. Alloglossoides caridicola gen. et sp. n. (Trematoda: Macroderoididae) from a Louisiana Crayfish . . . . . . 176
KINGSTON, NEWTON and JAMES CRUM. Trypanosoma cervi Kingston and Morton, 1975 . . . . . . 179
YUEKSEL, HASAN S. Pratylenchoides alkani sp. n. and P. erzurumensis sp. n. (Nematoda: Tylenchoidea) from Soil in Turkey . . . . . . 185
TODD, KENNETH S. Jr., ANTHONY M. GALLINA and JAMES M. SCHMIDT. Eimeria dunsingi Farr, 1960: A Coccidium of the Parakeet, Melopsittacus undulatus .188
CAMPBELL, RONALD A. New Tetraphyllidean and Trypanorhynch Cestodes from Deep-sea Skates in the Western North Atlantic . . . . . . 191
DRONEN, NORMAN O. Jr. and HAROLD T. UNDERWOOD. The Life Cycle of Cephalogonimus vesicaudus (Digenea:Cephalogonimidae) from Trionyx spiniferus from Texas . . . . . . 198
MILLER, DONALD M. and T. T. DUNGAN. The Lacunar System and Tubular Muscles in Acanthocephala . . . . . . 201
FAYER, RONALD. The First Asexual Generation in the Life Cycle of Sarcocystis bovicanis . . . . . . 206
AMIN, OMAR M. Helminth Parasites of some Southwestern Lake Michigan Fishes . . . . . 210
McCALLISTER, GARY and LARI M. COWGILL. Efficiency of the Seinhost Filter for the Recovery of Eimeria tenella Oocysts, from Feces . . . . . . 218
BAIN, GEOFFREY A. and WILLIAM THRELFALL. Helminth Parasites of Hooded Mergansers, Lophodytes cucullatus (L.), from Ontario . . . . . . 219
ERNST, JOHN V. and KENNETH S. TODD, Jr. New Geographic Record and Redescription of the Sporulated Oocyst of Eimeria pellita Supperer 1952 from Alabama Cattle . . . . . . 221
DRONEN, NORMAN O. and EDMUND C. GUIDRY. The Use of Selected Ratios as an Additional Comparative Tool in the Systematics of some Digenetic Trematodes (Ochetosomatidae) . . . . . . . 223
TURNER, HUGH M. and KENNETH C. CORKUM. New Snail Host for Spirorchis scripta Stunkard, 1923 (Digenea: Spirorchiidae) with a Note on Seasonal Incidence . .225
CHRISTENSEN, BRUCE M. Observations on the Epidemiology of Dirofilaria immitis in Urban Ames, Iowa . . . . . . 226
AMIN, OMAR M. and JOHN S. MACKIEWICZ. Proteocephalus buplanensis Mayes, 1976 (Cestoda: Proteocephalidea) from Semotilus atromaculatus in Wisconsin . . . . . 228
THRELFALL, WILLIAM and R. IAN GOUDIE. Larval Trematodes in the Rough Periwinkle, Littorina saxatilis (Olivi) from Newfoundland . . . . . . 229
KAZACOS, DEVIN R. Dirofilaria immitis in Wild Canidae from Indiana . . . . . . 233
BERGSTROM, R. C. and B. A. WERNER. Development of Abnormal Eggs from Young Female Trichostrongylid Worms . . . . . . 234
BROOKS, DANIEL R., ROBIN M. OVERSTREET and DANNY B. PENCE. New Records of Proterodiplostome Digeneans from Alligator mississippiensis and Caiman crocodiles fuscus . . . . . . 237
International Congress of Parasitology . . . . . . 125
Reprints of Identification of Parasitic Metazoa in Tissue Sections by M. B. Chitwood and J. R Lichtenfels . . . . . . 149
Editor’s Note . . . . . . 161
Manter Memorial Symposium . . . . . . 217
Editorial Acknowledgement . . . . . . 238
In Memoriam . . . . . . 239
Report of the Brayton H. Ransom Memorial Trust Fund . . . . . . 240