Trematodes and Cestodes 



15G-H 



Subfamily II AMPHICOTYLINAE Ltihe 1902 

 Genus Abothrium Beneden 1871, char, emend. Ltihe 1899 

 Abothrium rugosum (Batsch 1786) 



For a description and discussion of this species see also Cooper, 1919: 

 460-73. 



Habitat. — Intestine of Gadus callarias L., the cod, Cheticamp, Cape Breton 

 Island, Nova Scotia, September 13, 1917, and (?) Tautogolabrus adspersus W., 

 the cunner, at the same locality, June 28, 1917. 



The material from the latter host consisted of several gravid portions of 

 strobilas, very much contracted and degenerated, which I was not able to locate 

 with certainty. They probably belong to this species ana their condition may 

 be due to their having been picked up as very old fragments by the fish and their 

 having failed to continue their existence in the cunner, which is not normally a 

 host of A. rugosum. 



Abothrium crassum (Bloch 1779) 



This species has also been dealt with at length by the writer elsewhere 

 (1919: 474-88). 



Habitat. — Intestines of the following hosts :^ 



THE OCCURRENCE OF ABOTHRIUM CRASSUM IN HOSTS OF ARCTIC AMERICA. 



*See "Acanthocephala", Vol. IX, Part E: 5-6, of this Report, by H. J. VanCleave. 



Order II Tetraphyllidea Carus 1863 



Family PROTEOCEPHALIDAE LaRue 1914 



Genus Proteocephalus Weinland 1858 



Proteocephalus arcticus, sp. nov. 



(Figs. 8, 12.) 



Specific diagnosis. — With the characters of the genus. Small cestodes from 

 8 • 5 to 15 mm. in length and • 80 to 1-02 mm. in breadth. Scolex short, some- 

 what flattened, truncated, unarmed, 0-30 mm. in length by 0-43 in width. 

 Four suckers, muscular, with deep cavities, slightly directed forward, circular in 

 outline, 0-18 mm. in diameter. Fifth sucker vestigial. Neck not well differen- 

 tiated from strobila, about 1 • 8 mm. in length by • 32 in width. Surface smooth; 

 segmentation evident only in posterior one-third to one-half of strobila, posterior 

 margins of segments do not protrude, lateral margins convex, transverse inter- 

 segmental furrows shallow; 15 to 20 proglottides in all. First proglottides much 

 broader than long, 0-45 to 0-50 mm. by 0-18 to 0-22; mature segments about 



