96 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



dorsally and ventrally, and extends as a small protuberance at each 

 side. The oral sucker is subterminal, 0.33 by 0.34 mm. Its opening 

 is just anterior to the muscular ridge. Immediately posterior to the 

 collar is a deep ventral depression extending only a short distance 

 posteriorly. The esophagus is short and simple, measuring 0.15 mm. 

 in length. The ceca are voluminous with broad outpocketings along 

 their outer margins (fig. 5). 



The male and female pores are close together, opening ventrally 

 on the left side of the body about one fourth the body length from 

 the anterior end. The testes are in the extreme posterior end of the 

 body. They are large, deeply lobed, and directly opposite each other. 

 There are about eight primary lobes on each testis, but these may 

 be broken up into secondary lobes. The seminal vesicle is a narrow, 

 tightly coiled tube extending in the mid-body line from about the 

 anterior end of the vitellaria to the base of the short cirrus sac (fig. 

 5). It connects with the cirrus sac by an uncoiled portion passing 

 to the left from the mid-line. The cirrus sac lies almost horizontally, 

 and extends from the left side of the body to a point slightly beyond 

 the inner margin of the left cecum. It is divided into two portions, 

 one being wide, muscular, and prostatic, the other short, narrow, 

 and containing the cirrus. The prostatic portion is broad and spindle- 

 shaped with numerous small prostatic cells surrounded by a wide 

 sheath of thick longitudinal muscle bands (fig. 6). The short stout 

 cirrus is surrounded by a thin band of longitudinal muscles which 

 are continuous with some of those of the larger portion of the sac. 



The female pore lies to the left of the male pore. The ovary is 

 slightly lobed, and lies to the right of the mid-line immediately 

 anterior to the right testis. The ovary is less than half as large as 

 the right testis. The large shell gland lies on the mid-line between 

 the anterior portions of the testes. There is no definite membrane 

 present around the shell gland. Laurer's canal was not seen. There 

 is no seminal receptacle. The large irregular follicles of the vitellaria 

 are definitely arranged in a single, linear, extracecal series on each 

 side, extending from the anterior level of the testes to the posterior 

 level of the seminal vesicle. There are about sixteen follicles on the 

 right side, and eighteen on the left. The yolk ducts extend from the 

 anterior vitellaria posteriorly passing to the shell gland at the level 

 of the ovary. The uterus terminates in a very weak metraterm (fig. 

 6). The eggs measure about 63 /x in length and 29 /x in width. Ap- 



