ART. 13 TEEMATODE PARASITES OF MARINE MAMMALS PRICE 35 



{Canis familiaris^ Vulpes fulva, Phoca vituUna, and Mirounga 

 angustirostris) . 



Location. — Small intestine. 



Distrihution. — Europe and North America (United States, 

 Canada) . 



Remarks. — Cryptocotyle lingua appears to have been reported but 

 twice from pinnipeds. Ransom (1920) reported this species from 

 Phoca vitulina, the report being based upon specimens (U.S.N.M. 

 Helm. Coll. No. 4280) collected by Dr. Albert Hassall, December 21, 

 1905, at Washington, D. C. MacCallum (1916) described a trem- 

 atode, Distomum macrorhinis., from specimens collected from am 

 elephant seal, Macrorhinus angustirostris {=Mirouriga angustiros- 

 tris) , which died at the New York Aquarium. The writer has exam- 

 ined the specimens upon which MacCallum based his description 

 of D. macrorhlnis and finds no differences which would warrant re- 

 garding this form as a species distinct from Gryptocohjle lingua. 



Genus APOPHALLUS Luhe, 1909 



Synonyms. — Rossicotrema Skrjabin and Lindtrop, 1919, p. 40; 

 Cotylophallu-s Ransom, 1920, p. 529. 



Generic diagnosis. — Heteroph3adae : Body ovoid to very elongated 

 in shape. Prepharynx short; esophagus long; intestinal bifurcation 

 usually nearer to acetabulum than to oral sucker; intestinal ceca 

 slender, terminating as in Cryptocotyle. Acetabulum relatively 

 well developed, opening into a small, nonmuscular genital sinus; 

 genital ducts open into sinus at the base of two papilliform gonotyls ; 

 genital aperture cephalad of acetabulum. Seminal vesicle well de- 

 veloped, C or S shaped, dorsal to uterine coils. Testes ovoid or 

 globular, situated near posterior end of body, the right usually be- 

 hind left. Ovary ovoid or globular, situated to right of median 

 line cephalad of seminal receptacle. Vitellaria fill posttesticular 

 space and extend usually to acetabulum or beyond. Uterus as in 

 Cryptocotyle. 



Type species. — Apophallus miihlingi (Jagerskiold, 1899) Liihe, 

 1909. 



KEY TO SPECIES OF THE GENUS APOPIIAT.LUS OCCURRING IN MARINE MAMMALS 



1. Esophagus longer tliaii prepharynx; seminal vesicle slender, S 

 shaped ; vitelline follicles relatively small, not extending 



anteriorly as far as pharynx donicus (p. 3G). 



Esophagus shorter than prepharynx ; seminal vesicle wide, C 

 shaped ; vitelline follicles relatively large, extending to level 

 of pharynx _ zalophi (p. 36). 



