14G-H 



Canadian Arctic Expedition, 1913-18 



Testes in two lateral fields and two layers between the excretory trunks, 

 continuous from proglottis to proglottis; spherical in shape, 75 to 100^ in 

 diameter. Coils of vas deferens anterodorsal to cirrus-sac, the duct 15 to SO/i 

 in diameter, depending on the amount of spermatozoa it contains. Cirrus-sac 

 oval, 0-23 to 0-29 by 0- 15 to 0- 17 mm.; everted cirrus, 60 by 85m. 



Vagina, 10 to 25/i in diameter; receptaculum seminis, 40 to 60/i; spermiduct 

 lO/i. Ovary crescentic in shape, wings tubulolobular; isthmus almost spherical, 

 0-1 mm. in diameter. Oocapt, 25 to 30/i in diameter, oviduct 15 to 20/i. Com- 

 mon vitelline duct 120 by SOju. VitelUne follicles spherical, 60 to 90/i in diameter ; 

 in the lateral thirds of the strobila, continuous at the margins of the same and 

 from proglottis to proglottis. Shell-gland obscure. Uterus surrounded by 

 glandular cells proximally; 0-25 mm. in maximum diameter. 



Eggs, 36 to 40 by 24 to 25/i in dimensions. 



Habitat. — The intestines of Salvelinus malma (Walbaum) and a whitefish, 

 Coregonus sp. as follows: — 



THE OCCURRENCE OF BOTHRIMONUS INTERMEDIUS IN HOSTS OF ARCTIC 



AMERICA. 



As in the case of Cyathocephalus americanus the original diagnosis of this 

 species is here amended in part owing to the fact that the material Hsted above 

 gave measurements which are considerably larger than those set forth previously 

 by the writer. Other characters of a qualitative nature, however, clearly 

 indicate that the form belongs to B. intermedins and is quite different from the 

 European and other species, of which B. olrikii (Krabbe 1874) ( = Dipllocotyle 

 olrikii) was found in Samo carpio in Greenland, and B. cohaerens (Linstow 1903.) 

 ( = Z). cohaerens) in Pleuronectes flesus on the Murman coast. 



I should like, furthermore, to take this opportunity of adding a fourth host 

 for this species of cestode, namely Zoarces anguillaris (Peck), the eelpout, from 

 which Dr. W. A. Clemens of the University of Toronto obtained several lots of 

 material at St. Andrews, New Brunswick, in the summer of 1919, and sent them 

 to me recently for determination. 



Family II PTYCHOBOTHRIIDAE Liihe 1902 



Sub-family I Ptychobothriinae Ltihe 1899 



Genus Bothriocephalus Rud. 1808, e.p. Liihe 1899, e.p. Cooper 1919 



Bothriocephalus scorpii (MuUer 1776) 



For a comprehensive synonymy and a diagnosis of this species see Cooper, 

 1919: 384-402. 



Habitat. — Intestine of Oncocottus quadricornis L., four-horned sculpin, 

 Bernard harbour and Cockburn point, August 30, 1914, C.A.E. Station 37d, and 

 August, 1915, Station 41^/. 



