ABT. 19 NEW GENUS AND SPECIES OF TREMATODE — LUCKER d 



in which the vas efferens may be traced anteriorly, the position of 

 these ducts varies considerably. In one specimen the duct of the 

 posterior testis passes anteriorly between the intestinal ceca and 

 anterior testis on the left and turns transversely to the right just 

 posterior to the transverse vitelline duct. On the right it joins the 

 vas efferens from the anterior testis and from this point proceeds as 

 the vas deferens to the seminal vesicle. Shortly before the cirrus 

 pouch is reached a small sac or reservoir is formed. (PL 1, fig. 2.) 



The seminal vesicle is bulky and rather long, occupying the pos- 

 terior half of the slender cirrus pouch. Anterior to it are the narrow 

 prostate canal, the ejaculatory duct, and the protrusible cirrus. (PL 



1, fig. a.) 



The ovary is located immediately caudad to the posterior border 

 of the cirrus pouch, a short distance posterior to the acetabulum, 

 and immediately anterior to the seminal receptacle. The diameter 

 of the ovary is about 0.22 mm. to 0.24 mm. 



A rather large and definite seminal receptacle is present, anterior 

 to the anterior testis, from which it is separated by the transverse 

 vitelline duct, and immediately posterior to the ovar3\ 



The uterus is extensive, filling the posterior half of the body. It 

 extends from the termination of the short oviduct posteriorly and 

 ventrally, under the ventral surfaces of the testes to the posterior tip 

 of the body, and then returns anteriorly to the genital pore. Both 

 the descending and ascending portions are coiled transversely and 

 are folded upon themselves. The coils of the uterus are slender, 

 except perhaps posteriorly, where no definite form is discernible. 

 It is to be noted that the uterus passes not between the testes but 

 under their ventral surfaces. The ascending ramus also passes 

 ventrall}' beneath the seminal receptacle, ovary, and cirrus i^ouch. 



The vitellaria are distinct follicles, disposed in lateral chains, and 

 extend from near the posterior edge of the ovary to a point about 

 one-fifth of the body length from the posterior tip of the body. 

 There is no pattern or definite organization of the follicles. The 

 juncture of the oviduct, the vitelline duct, and the duct of the sem- 

 inal receptacle is variable in position, but usually these ducts unite 

 in close proximity to the ovary and seminal receptacle. (PL 1, fig. -i.) 

 Laurer's canal is present and communicates directly with the sem- 

 inal receptacle. The yolk reservoir is variable in position but is lo- 

 cated somewhere along the transverse vitelline duct and near the 

 median line. 



The fully formed eggs are brownish yellow and about 0.048 mm. to 

 0.058 mm. long and 0.018 nmi. to 0.026 nun. wide. Those observed 

 in the initial portion of the descending ramus are transparent and 

 colorless. 



