ILLUSTRATIONS XV 



Four New Species of Trematode Worms op the Subfamily 

 Onchocotylinae 



By G. A. MacCaUum ^ . 



Facing page 



1. Form of hooks of mouth suckers and small hooklets in appendix of 



Squalonchocotyle canis, S. acanthi, Acanthonchocotyle musteli, Squa- 



lonchocotyle vulgaris, S. sphyrnae, and S. squali 3 



Descriptions of a New Genus and Eight New Species op 

 Ichneumon-flies, with Taxonomic Notes 



By C. F. W. Muesebeck 

 1 . Anterior wing of Paroligoneurus johnsoni, new species 8 



Four New Species of Trematode Worms from the Muskrat, 

 Ondatra zibethica, with a Key to the Trematode Para- 

 sites OF the Muskrat 



By Emmett W. Price 



1. Psilostomum ondatrae 2 



2. Echinochasmus schwartzi 4 



3. Urotrema shillingeri 8 



4. Paramonostomum pseudalveaium 9 



A New Species of Trematode of the Family Heterophyidae, 

 with a Note on the Genus Apophallus and Related Genera 



By Emmett W. Price 



1. Apophallus crami, new species 2 



Some New Middle Cambrian Fossils from British Columbia 

 By Rudolf Ruedemann 



1 . Bostrichopus antiquus Goldfuss 6 



2. Nauplius larva of Lepas fascicularis 8 



3. Early growth stage of Apus 10 



4. Marrella splendens 12 



5. A young trilobite with large cephalon, showing in white the portion 



preserved in the specimen of Marrella splendens 13 



6. Daphnia longispina O. F. Miiller 16 



The Stegocephalid and Ampeliscid Amphipod Crustaceans of 

 Newfoundland, Nova Scotia, and New Brunswick in the 

 United States National Museum 



By Clarence R. Shoemaker 



1-2. Phippsiella minima Stephensen 3, 4 



3-4. Andaniella pectinata (G. O. Sars) 6, 7 



5-6. Haploops spinosa, new species 14, 15 



