2 PEOCEEDINGS OP THE IS^ATION-AL MUSEUM vol.78 



extensive, occupying about two-thirds of the body length. Laurer's 

 canal present (at least in some species). Uterus short and contain- 

 ing but one egg at a time. 



Type species. — OrnitJioMlharzia intermedia Odhner, 1912. 



ORNITHOBILHARZIA PRICEI, new species 

 Plate 1, Figures 1-4 



Specific diagnosis. — Ornithobilharzia : 



Male 5.3 to 6.2 mm. long and with a maximum width of 600 to 

 625/;!,. The lateral edges of the body are infolded ventrally to form a 

 deep gjmaecophoric canal. The cuticle is covered with small blunt 

 spines. Oral sucker cup-like, subterminal, and 125 to 150/a in 

 diameter; acetabulum circular, 185/^ in diameter, and situated from 

 232 to 300/i caudad of the oral sucker. Both suckers are covered with 

 fine spines. The esophagus is simple, weakly muscular, and bifur- 

 cates immediately in front of the acetabulum. The intestinal ceca 

 are sinuous, provided with small diverticula, and unite about one- 

 fifth of the body length from the posterior end. The common cecum 

 runs a zig-zag course and terminates about 60/^ from the posterior 

 end of the body. The testes, 28 in number, are arranged in two 

 alternating rows in the median line and occupy the second fifth of 

 the body length ; they originate about 450/x, caudad of the acetabulum 

 and extend backward as far as 1.5 mm. from it. The seminal vesicle 

 is oval in shape and lies midway between the first testis and the 

 acetabulum. A cirrus pouch appears to be absent. The genital pore 

 is situated 175/a caudad of the acetabulum and to the left of the 

 median line. The excretory pore is terminal; the details of the 

 excretory system could not be made out. 



Female longer than male. The cylindrical body is 9 mm. long, 

 slender, having a thinner anterior part, about 50/x wide, which 

 gradually becomes thicker and attains its maximum width of 112/x 

 in the region of the ovary. The cuticle is covered with very fine 

 spines. Oral sucker subterminal, poorly developed; acetabulum 

 prominent, 60 to 70/t in diameter, and situated about 505/a caudad 

 of the oral sucker. The esophagus is simple and bifurcates imme- 

 diately in front of the acetabulum. The intestinal ceca are relatively 

 short and sinuous, and unite about 3.1 mm. caudad of the oral sucker. 

 The slender common cecum is very long, occupying about two-thirds 

 of the body length. The elongated ovary is loosely coiled and 

 occupies the second fifth of the body length; it originates about 

 1.8 mm. from the anterior end of the body, is 1.3 mm. long when 

 measured in a straight line and disregarding the total length of the 

 spiral, and terminates near the union of the ceca. The oviduct 

 arises from the posterior pole of the ovary and runs ventral to it in 



