No. 2322. TREMATODE FAMILY HETEROPHYIDAE— RANSOM. 537 



ventral sucker, instead of two to three times as large as the oral 

 sucker, is only one-half to three-fourths larger. Average diameter 

 of oral sucker, 50 jx ; ventral sucker, 80 [x ; genital sucker, 46 [x. Eggs 

 dark brown, but somewhat lighter than those of H. dispar. 



H£TEROPHTES PERSICUS (Brann, 1901) Loobs, 1902. 



Fig. 4. 



1901. Cotylogonimus persicus Bkaun, 1901 e, pp. 334-338, pi. 20, fig. 13 (in 



Persian wolf; Germany). 



1902. Heterophyes persicus (Braun, 1901) Looss, 1902w, pp. 782, 785. 



Specific diagnosis. — Heterophyes: Length, 3 to 4 mm.; maximum 

 width, 0.8 to 0.9 mm. Oral sucker globular, 104 ^ in diameter, or 

 transversely elongated, 73 by 104 pi. Prepharynx rather long but 

 shorter than the esophagus. Pharynx almost globular, 62 jjl long by 

 53 [A wide. Bifurcation of intestine in front of the ventral sucker a 

 distance about equal to its diameter. Intestinal ceca end near the 

 excretory vesicle. Ventral sucker near the boundary between the 

 middle and posterior thirds of the body, 375 to 416 [k in diameter. 

 Genital sucker, about 250 \l in diameter, on the left side of and ob- 

 liquely behind the ventral sucker, usually circular, occasionally some- 

 what broader than long. Crown of chitinous rodlets interrupted on 

 the side of the genital sucker toward the ventral sucker. Rodlets 

 slightly curved, supplied with 4 to 6 small pointed processes directed 

 toward the free end of the rodlet, this free end being turned toward 

 the center of the sucker. The pointed processes of the rodlet at the 

 same time, however, lie in a plane perpendicular to the surface of the 

 sucker. Number of rodlets 62 to 70; length nearly uniform, 9 to 

 10.4 [x; those near the interrupted portion of the crown always a 

 little shorter than the others. Testes elliptical, left testis sometimes 

 somewhat more anterior than right testis, about 200 by 160 \i. in di- 

 ameter. Ovary, 145 \i in diameter, in median line in front of testes. 

 Seminal receptacle not apparent, coils of uterus filling space between 

 testes and ovary. Vitellaria only weakly developed ; as viewed from 

 ventral surface appear to consist of 6 to 9 lobules on each side, extend- 

 ing from the level of the anterior border of the ovary to the level of 

 the middle of the testes. As viewed from the dorsal surface the vitel- 

 laria are seen to consist of about 12 to 18 lobules on each side, since 

 they push inwards between the coils of the uterus almost to the ovary. 

 Most of the space between the testes and ventral sucker occupied by 

 the uterus. Behind the ventral sucker a small globular organ belong- 

 ing to the male copulatory apparatus. Mature eggs thick-shelled, 

 dark brown, 22.8 jx long, 14 pi. wide. 



Host. — Persian wolf. 



Location. — Intestine. 



Locality collected. — Germany (Berlin Zoological Garden). 



