FOSTER, AUREL, O., and GILBERT F. OTTO. Fifty Years-Fifty Volumes of the Proceedings of the Helminthological Society of Washington 1934-1983 . . . . . . 187
GOLDEN, A. MORGAN. The Braytom H. Ransom Memorial Trust Fund . . . . . . 200
GRANATH, WILLARD O., Jr., and GERALD W. ESCH. Seasonal Dynamics of Bothriocephalus acheilognathi in Ambient and Thermally Altered Areas of a North Carolina Cooling Reservoir . . . . . . 205
HAYUNGA, EUGENE G., MARY P. SUMNER, MICHAEL STEK, Jr., WILTON E. VANNIER, and RUBY Y. CHESTNUT. Purification of the Major Concanavalin A-Binding Surface Glycoprotein from Adult Schistosoma mansoni . . . . . . 219
BERGSTROM, ROBERT C. Aphodius Beetles as Biological Control Agents of Elk Lungworm, Dictyocaulus hadweni . . . . . . 236
STRINGFELLOW, FRANK. Chloride Ions in Gastric Contents from Helminth-free Calves Repel Exsheathed Larvae of Ostertagia ostertagi . . . . . . 240
STOCK, T. M., and M. W. BARRETT. Helminth Parasites of the Gastrointestinal Tracts and Lungs of Moose (Alces alces) and Wapiti (Cervus elaphus) from Cypress Hills, Alberta, Canada . . . . . . 246
CONTI, JOSEPH A., DONALD J. FORRESTER, and JAMES R. BRADY. Helminths of Black Bears in Florida . . . . . . 252
DYER, WILLIAM G. A comparison of the Helminth Fauna of Two Plethodon jordani Populations from Different Altitudes in North Carolina . . . . . . 257
LICHTENFELS, J.R., and P. A. PILITT. Cuticular Ridge Patterns of Nematodirus (Nematoda: Trichostrongyloidea) Parasitic in Domestic Ruminants of North America, with a Key to Species . . . . . . 261
WONG, P. L., ROY C. ANDERSON, and JACK FRIMETH. Diplotriaena utae sp. n. (Nematoda: Diplotriaenoidea) in the Gray Jay (Perisoreus canadensis (L.)) in Ontario, Canada . . . . . . 275
GARDNER, SCOTT L., and DOUGLAS P. JASMER. Heligmosomoides thomomyos sp. n. (Nematoda: Heligmosomidae) from Pocket Gophers, Thomomys spp. (Rodentia: Geomyidae), in Oregon and California . . . . . . 278
DEARDORFF, THOMAS L., and RONALD C. KO. Echinocephalus overstreeti sp. n. (Nematoda: Gnathostomatidae) in the Stingray, Taeniura melanopilos Bleeker, from the Marquesas Islands, with Comments on E. sinensis Ko, 1975 . . . . . . 285
ADAMSON, MARTIN L. Ichthyocephalus seymouri sp. n. and a Redescription of Ichthyocephalus ichthyocephalus Artigas, 1926 (Nematoda: Rhigonematidae) from Diplopods in Brazil . . . . . . 294
SIDDIQI, MOHAMMAD RAFIQ, and ZAIUDDIN AHMAD SIDDIQUI. Paratrophurus acristylus sp. n. and Tylenchorhynchus graciliformis sp. n. (Nematoda: Tylenchida) from Wheat Fields in Libya . . . . . . 301
THATCHER, VERNON E., and DELANE C. KRITSKY. Neotropical Monogenoidea. 4. Linguadactyloides brinkmanni gen. et sp. n. (Dactylogyridae: Linguadactyloidinae subfam. n.) with Observations on its Pathology in a Brazilian Freshwater Fish, Colossoma macropomum (Cuvier) . . . . . . 305
KENNEDY, MURRAY JAMES. A Revision of North American Species of the Genus Parametorchis Skrjabin, 1913 (Trematoda: Opisthorchiidae) . . . . . . 312
DUBEY, J. P. Sarcocystis montanaensis and S. microti sp. n. from the Meadow Vole (Microtus pennsylvanicus) . . . . . . 318
CHING, HILDA LEI, and LOIS PARKER. Report of Water Mite Larvae in the Esophagus and Stomach Walls of Mountain Whitefish in British Columbia . . . . . . 325
HERLICH, HARRY. Resistance of Calves to Reinfection with Oesophagostomum radistum . . . . . . 330
TUGGLE, BENJAMIN N. Tetrameres grusi (Nematoda: Tetrameridae) from Foster-Raised Whooping Crane . . . . . . 332
LIGHTNER, LAWRENCE K., and MICHAEL J. REARDON. Dipetalonema dracunculoides in Dogs and Spotted Hyena (Crocuta crocuta) in the Turkana District of Kenya . . . . . . 335
KASS, T. B., and R. C. BERGSTROM. Occurance of Nematodirella sp. (Nematoda: Trichostrongyloidea) in Domestic Sheep (Ovis aries) of Wyoming . . . . . 335
HO, LIAN-YIN, MARIETTA VOGE, and LAWRENCE R. ASH. Surface Ultrasound of the Human Liver Fluke, Clonorchis sinensis . . . . . . 337
DYER, WILLIAM G. Some Digenetic Trematodes of Marine Fish from Virgin Gorda, British Virgin Islands . . . . . . 341
PRICE, ROBERT L., and DENNIS M. HARMAN. Helminths from the Raccoon, Procyon lotor litoreus Nelson and Goldman 1930, on St. Catherines Island, Georgia . . . . . . 343
PENCE, DANNY B., JOEL T. MURPHY, FRED S. GUTHERY, and TED B. DOERR. Indications of Seasonal Variation in the Helminth Fauna of the Lesser Prairie Chicken, Tympanuchus pallidicinctus (Ridgeway) (Tetraonidae), from Northwestern Texas . . . . . . 345
BOX, EDITH D. Recovery of Sarcocystis Sporocysts from Feces After Oral Administration . . . . . . 348
FRIED, BERNARD, and ANNMARIE PALLONE. Effects of Viscous Agar on In Vitro Pairing of Echinostoma revolutum (Trematoda) Adults . . . . . . 350
Erratum . . . . . 235
Fourth European Multicolloquium of Parasitology . . . . . . 293
Increased Charges and Dues . . . . . . 245
Index . . . . . . 355
In Memoriam . . . . . . 199
Instructions to Authors . . . . . . 324
Minutes . . . . . . 352
Report of the Brayton H. Ransom Memorial Trust Fund . . . . . . 204
The “Denis Thienpont” Prize . . . . . . 284
Workshop . . . . . . 239