12(1-11 Canadian A relic /<:.*/>/, /////>//. 1913-18 



riocephalus. The body is depressed and ligulate, the margins being parallel for 

 almost the whole Irngth :md the posterior end gradually tapered to a diameter 

 .-lightly smaller than the tip of the scolcx. 



On the whole these larvie resemble others that I have taken from cyst- in 

 the wall of the stomach <f Lota maculosa (LeSueur), the burbot, at Port Credit, 

 < >n tin-in, near Toronto, and at Charlevoix, Michigan, and which may be similar 

 to those NicUerson i 1906) found in fishes from the Great Lakes but suspected 

 might. belong to Bpeoiefi other than Diphyllobothrium latum, the broad human 

 Ui4Klworiii^, Incidentally the writer is conducting feeding experiments with fn"e 

 Tarvsefrom the burl)ot in an endeavour to ascertain whether they are young of 

 I), latum and whether the cases of infection with this cestode in America can lie 

 accounted for in this direction. 



Genus II Pyramicocephalus Monticelli 1890 

 Pyramicocephalus phocarum (Fabricius 1780) 



This species, described by Linstow (1905:14-15) under the name of P. aniho- 

 cephalus (Rud.), was collected from Erignathus barbatus (Erxleben), bearded 

 seal, as follows: 



THE OCCURRENCE OF PYRAMICOCEPHALUS PHOCARUM IN ERIGNATHUS 

 BARBATUS IN ARCTIC AMERICA. 



The largest specimen, one from Station 40,w, measured 900 nun. in length 

 by 6 mm. in maximum width and its scolex, 4 mm. in length, 2 in width and 3 in 

 depth. Another from the same lot was 320 mm. by 5 in dimensions. The eggs, 

 when measured in the sections, were found to vary from 58 to 65^t in length by 

 34 to 39 in width. Linstow gave their measurements as 65 by 39ju. 



Two larvae, as well as adults, were found in the material from Station 

 4Qt,u, while another larva was all that was taken from a specimen of common 

 rough seal, Phoco hispida Schreber, at Collinson point, Alaska, on September 7, 

 1913, at Station 27 j. 



Subfamily III Gyathocephalinae Liihe 1899, e.p. Cooper 1919 



Genus I Cyathocephalus Kessler 1868 

 Cyathocephalus americanus Cooper 1917, e.p 



1917: Cyathocephalus americanus.. . .COOPER 1917: 35 



(Type host, Coregonus clupeiformis, whitefish, Georgian Bay, L:;kc 

 Huron) 



1919: Cyathocephalus americanus.. . . COOPER 1919: 341 



Specific diagnosis. With the characters of the genus. Small cestodes, 

 attaining a length of at least 16 mm. with a maximum breadth of 1-7 mm. 

 Scolex funnel-shaped, 3 to 9 mm. long and 5 to 1-50 broad, with a revolute 

 margin. Neck 1-0 to 3-0 mm. in length. Segments twice as broad as long, 

 terminal one rounded. 



