2 PROCEEDINGS OF THE NATIONAL MUSEUM vol.75 



sucker, is nearly spherical, and measures about 50/x to 60^ in diam- 

 eter. There is no esophagus, since the pharynx opens directly into 

 the anterior portions of the intestinal ceca which form a transverse 

 tube about 200ai long; this tube bends posteriorly at its distal ends 

 to continue as the posterior portions of the intestinal ceca. The 

 latter pursue an irregular wavy course near the lateral margins of 

 the body, but medial to the yolk glands. The transverse portion 

 just behind the pharynx may be slightly curved so that the lateral 

 shoulders are very slightly more anterior than the part of the tube 

 into which the pharynx opens. At the posterior end of the body 

 the ceca curve dorsally and medially and end very close together; 

 in one sectioned specimen the walls of the posterior extremities of 

 the ceca are in contact. 



The excretory system opens by a minute pore toward the dorsal 

 side of the posterior extremity. From this a fine tube leads forward, 

 enlarging into a small reservoir, and then branching to right and left. 



The testes are on different planes. The right testis lies medially in 

 the posterior part of the body, while the left one is situated well on the 

 left side of the body between the posterior testis and the acetabulum. 

 The position of the left testis varies; in some specimens the anterior 

 border of the testis lies on a level with or even slightly anterior to 

 the posterior border of the acetabulum, while in others it is distinctly 

 posterior to this, but it is always somewhat nearer to the acetabulum 

 than to the right testis. The testes are round or slightly oval, never 

 lobate, and measure 105^ to 140^ or more in diameter. Usually the 

 anterior testis is slightly larger than the posterior one, but this is not 

 invariably the case. The cirrus is an extremely large and powerful 

 organ, and when extruded is very conspicuous in fresh specimens. 

 The extruded cirrus in one of the writer's specimens measures 140ju 

 in length with a diameter of 50/x. In one specimen loaned by Doctor 

 Francis it is still larger. The cirrus pouch into which it is retracted 

 is very long and cylindrical, pursuing a more or less wavy course 

 anteriorly and terminating near the posterior border of the acetabu- 

 lum. The proximal portion is surrounded by a large mass of prostate 

 glands. The vas deferens leading from the anterior testis to the 

 proximal end of the ejaculatory duct is short and direct; the one 

 leading from the posterior testis could not be followed in either 

 whole mounts or sections. The cirrus and uterus open side by side 

 in the posterior part of the body, the cirrus near the median line, 

 and at the level of the ovary, and the metraterm to the left. The 

 genital openings are nearer to the posterior end of the body than to 

 the posterior border of the acetabulum, and not more than 200m to 

 250/1 from the posterior end. 



