No. 2322. TREMATODE FAMILY HETEROPHYIDAE— RANSOM. 561 



150 pi. Bifurcation of intestine immediately behind the pharynx. 

 Intestinal ceca extend into the posterior portion of the body, but their 

 termination has not been definitely determined. Ventral sucker, 60 \i 

 in diameter, located in contracted specimens at the beginning of the 

 middle third of the body. Genital sinus transversely elongated, 

 situated immediately in front of the ventral sucker. Testes 150 by 

 80 {JL in diameter. Seminal vesicle very large. Prostatic portion of 

 vas deferens well developed, cavity may be enlarged spherically to a 

 diameter of 20 [jl; terminal portion of vas deferens opening into the 

 genital sinus may attain a diameter of 20 \i. Seminal receptacle may 

 attain a diameter of 70 [x. Vitellaria are nearer the dorsal than the 

 ventral surface, and extend from the neighborhood of the excretory 

 pore in the posterior end of the body forward along the lateral 

 borders and bend inward in front of the ventral sucker and behind 

 the bifurcation of the intestine, nearly meeting in the median line. 

 Uterus terminates in a vagina about 50 jjl long, which empties into 

 the genital sinus. Eggs yellowish-brown, 30 by 15 y. in diameter. 



Hosts. — Milvus aegyptius (=il/. parasiticus) ; dog. 



Location. — Intestine. 



Localities collected. — Egypt; Formosa. 



Leiper (1913, pp. 176-177) describes and figures a fluke found in 

 the feces of a dog in Formosa that corresponds to G . cuspidatus., but 

 shows only 28 spines surrounding the mouth. As the single specimen 

 collected was in a poor state of preservation, Leiper suggests that 

 some of the spines originally present may have been lost. Leiper 

 proposes that the fluke from the dog in Formosa be recognized as a 

 variety, C entrocestus cuspidatus caninus., until material for further 

 study is available, as it appears questionable to him that the same 

 fluke should be found in the kite in Egypt and in the dog in Formosa. 



Genus ASCOCOTYLE Looss, 1899. 



Generic diagnosis. — Heterophyidae : Mouth surrounded by a crown 

 of spines. Oral sucker with an elongated posterior cecum, extending 

 backward on the dorsal side of the prepharynx. Prepharynx long. 

 Pharynx near the bifurcation of the intestine. Bifurcation of in- 

 testine nearer to the ventral sucker than to the oral sucker. Ventral 

 sucker median, posterior of the middle of the body, opening to the 

 exterior, in some species, if not in all, through the genital pore. The 

 genital sinus, which opens to the exterior through the genital pore, 

 and in which the vas deferens and vagina terminate, is situated im- 

 mediately in front of the ventral sucker. Well-developed seminal 

 vesicle behind the ventral sucker. Testes globular or oval, side by 

 side, near posterior end of body. Seminal receptacle in front of 

 144382— 20— Proc.N.M.vol. 57 36 



