16 THE HANCOCK PACIFIC EXPEDITIONS VOL.2 



The genital pore is median very closely anterior to the acetab- 

 ulum. It may even be directly ventral to the anterior edge of the 

 acetabulum. The testes are immediately posterior to midbody, tan- 

 dem, close together, lobed, squarish in shape. The posterior testis 

 is usually slightly longer. The posttesticular space varies from 2.497 

 to 4.455 mm. being always considerably longer than the forebody. 

 The seminal vesicle is a large, elongate, thin-walled sac, free in the 

 parenchyma, extending backward from near the posterior edge of 

 the acetabulum almost to the ovary from which it is separated by 

 the seminal receptacle. The pars prostatica is about the same length 

 as the seminal vesicle. It extends uncoiled diagonally forward dorsal 

 to the acetabulum or, rarely, along the right side of the acetabulum. 

 Its lumen is narrow and smooth, its wall fairly thick and cellular, 

 surrounded by a few prostatic gland cells. These flattened and gran- 

 ular gland cells lie free in the parenchyma and are most numerous 

 near the vesicle. The uterus enters the pars prostatica dorsal to the 

 acetabulum to form a long tubular slightly muscular ductus herm- 

 aphroditicus or genital sinus. This tube bends ventrally toward the 

 genital pore at the anterior edge of the acetabulum or may seem to 

 bend back to reach the genital pore from an anterior direction (plate 

 2, fig. 5) but this appearance may be due to flattening of the speci- 

 men. The genital sinus is approximately the same length as the pars 

 prostatica. Its lumen is wide, its wall fairly thin but muscular and 

 surrounded by a few rounded non-granular cells. 



The ovary is globular, pretesticular, to the right near the right 

 cecum. It is separated from the anterior testis by a short space 

 occupied by Mehlis' gland and the yolk reservoir. The uterus arises 

 from the posterior side of the ovary and extends back as far as the 

 anterior testis whence it coils forward to occupy the intercecal space 

 to the left and anterior to the ovary. It joins the pars prostatica 

 dorsal to the acetabulum as noted. A large seminal receptacle is 

 present anterior to the ovary adjacent to the seminal vesicle. It 

 connects to the oviduct posterior to the ovary, Laurer's canal is well 

 developed, coiled, opening on the dorsal surface just anterior to the 

 ovary. Eggs measure 88 to 102 by 48 to 60 ix, usually about 95 by 

 54 fi. The vitelline follicles extend from the level of the ovary to 

 the posterior end of the body. At first extracecal, they become con- 

 fluent posterior to the testes. 



