70 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 55. 



(fig. 72) are vase-shaped. Terminal gravid segments (fig. 73) be- 

 come four times as long as wide. The genital pores are considerably 

 anterior of the middle of the lateral margin of the segment, their 

 position marking the point of maximum width of the vase-shaped 

 segment. 



31 ale genitalia. — Testes, judging from the figure, are few in num- 

 ber and scattered through the median field. Vas deferens in loops 

 directed toward the anterior portion of the segment, and pigmented 

 black. Cirrus pouch cylindrical, somewhat twisted, and opening 

 ventral of the vagina; it apparently crosses the longitudinal canals 

 in a wide curve, the convexity of the curve directed posteriorly. 



Female genitalia. — Ovaries compact and globular to reniform. 

 Vitellaria spherical. The vagina opens dorsal of the cirrus pouch 





/ 



Fig. 71.— Dipylidium trinchesei. Hooks, a, Hook from first or 



MOST ANTERIOR ROW; 6, FROM SECOND ROW; C, FROM THIRD ROW; 

 d, FROM FOURTH ROW. KnLARGED. AfTER DiAMARE, 18936. 



A 



Fig. 72.— Dipylidium trinche- 



sEi. Mature segment. En- 

 larged. After Dumare, 

 18936. 



and passes medially to a large receptaculum seminis between the 

 ovarian lobes. The egg capsules contain one egg each. 



Hosts. — Primary : Felis catus {F. domestica) . Secondary : Zamenis 

 viridiflavus. 



Location. — In small intestine of primary host. In cysts in the 

 intestinal wall of the secondary host. 



Localities. — Italy (Naples) ; Egypt (Alexandria). 



Life history. — Diamare believes that Cysticercus acanthotetra Pa- 

 rona (1887) found in Sardinia in cysts in the intestinal wall of the 

 snake Zamenis viridiflavus, is the larva of Dipylidium trinchesai. 

 If this theory is correct, the worm is an accidental parasite of the 

 cat, as cats are not generally in the habit of eating snakes, as 

 Blanchard (1907) has noted. It might also be urged that there is 

 probably comparatively little opportunity for the ingestion of the 

 eggs of the adult worm by a secondary host like the snake except by 



