558 PROCEEDINGS OF THE NATIONAL MUSEUM. vol, 57. 



Hosts. — Alaskan fox {Vulpes lagojms) ; dog; cat. 



Location. — Intestine. 



Locality collected. — Washington, District of Columbia. 



Type specimens. — United States National Museum Helmintliologi- 

 cal Collections No. 19031, collected from an Alaskan fox, National 

 Zoological Park, Washington City, by Dr. H. W. Graybill, May 2, 



1906. 



Besides the type specimens of C. venustus, the United States Na- 

 tional Museum Collections contain specimens collected by Dr. E. C. 

 Stevenson from foxes August 9, 1906 (No. 4487), and December 17, 

 1906 (No. 4657). There are also in the collections specimens col- 

 lected by Stevenson from a dog May 25, 1907 (No. 14472), and 

 specimens collected by Lieut. Col. E. E. Whitmore from the small 

 intestine of a cat in 1918 (No. 19022), all in Washington, D. C. 



The specimens from the cat (figs. 23, 24) are much smaller (0.3 

 to 0.7 mm. long, 0.23 to 0.45 mm. wide) than those from the foxes 

 (fig. 22) and the dog (fig. 25), most of them quite immature and not 

 yet containing eggs. Some of the largest contain a few eggs. The 

 differences between the specimens from the cat and those from the 

 fox, however, do not appear sufficient to justify the recognition of a 

 distinct species. 



COTYLOPHALLUS SIMILIS, new species. 



Fig. 26. 



1920. Cotylophallus simiUs Ransom, 1920 (the present paper), (in Phoca 

 vituUna; U. S.). 



Specific diagnosis. — Cotylophallus: Maximum length, 1.14 mm., 

 usually between 0.5 and 0.9 mm. ; maximum breadth, 0.22 to 0.39 mm. 

 Cutaneous scales 1.5 to 3 ja wide, 4 to 7.5 ]x. long. Oral sucker, 65 to 

 85 [X in diameter. Pharynx, 30 to 44 jx in transverse diameter. Bifiir- 

 cation of intestine, 135 to 265 ^ (from about one-fourth to a little 

 over one- third the body length) from the anterior end of the body ; 

 intestinal ceca extend into posterior fourth of body. Ventral 

 sucker, 185 to 560 u, (about one-half, usually a little less than one- 

 half the body length) from the anterior end of the body, 48 to 60 (jl 

 wide by 45 to 68 [;. long. Testes in posterior third of body, oval 

 or globular, 80 to 200 ^ by 60 to 200 .x. Ovary 65 to 140 jj. by 40 to 

 120 [i, situated 200 to 750 [i. (about two-thirds the body length) from 

 the anterior end of the body. Seminal receptacle, 60 to 130 a by 35 

 to 90 \L. Vitellaria with numerous lobules extending across the body 

 between the levels of the anterior border of the ventral sucker and 

 the bifurcation of the intestine ; behind the level of the ventral sucker, 

 being arranged mostly in a single row on each side of the body along 

 the outer sides of the intestinal ceca and testes ; lobules scarce in the 



