128 KANSAS UNIVERSITY SCIENCE BULLETIN. 



the posterior end— and tapers gradually to a diameter of about 

 .12 millimeter. The prostate glands occupy all the cavity of 

 the cirrus-sac not taken up by the other enclosed organs. 



The ovary is situated a little to the right of the median 

 line against the dorsal body wall, just posterior the cirrus-sac. 

 It is oval in shape, measuring .415 millimeter in length and 

 .332 millimeter in diameter. The oviduct arises from the left 

 dorsal surface of the ovary as a small short tube, and passes 

 at once into the small ootype, which is surrounded by the 

 shell gland. There is no receptaculiim seminis. From the 

 ootype a slender Laurer's canal passes slightly posteriorly to 

 the dorsal body wall, having its external opening in the median 

 line. The yolk glands consist of about fifty rounded bodies on 

 each side of the body, mainly outside of the intestinal c£eca, 

 extending over about the middle third of the body. A main 

 duct from the anterior and one from the posterior parts of 

 each gland join to form the two transverse ducts which join 

 in the median line to form the common yolk duct, which enters 

 the ootype on the posterior side. On the ventral side of the 

 ootype the uterus arises as a small tube, which soon turns 

 posteriorly, and as it passes toward the hinder end of the body 

 grows larger and pursues a rather serpentine course. Near 

 the posterior end of the body the uterus turns back and passes 

 anteriorly, dorsal to the descending limb, to a point to the 

 left of the middle of the cirrus-sac, where it enters the metra- 

 term. The ascending limb becomes very voluminous as it 

 passes forward and occupies a large part of the body cavity. 

 In younger specimens the limbs of the uterus are small and ot 

 the same diameter, but in the adult the ascending limb is many 

 times larger, and, being filled with a dense mass of eggs, often 

 hides many of the other structures. The egg measures .031 

 millimeter in length and .016 millimeter in width. The metra- 

 term lies in the same plane as the cirrus-sac and to its left. 

 It passes in a curved course to the genital pore, which lies in 

 the median ventral line a short distance anterior to the ace- 

 tabulum, immediately anterior to the cirrus. It is a compaia- 

 tively thick-walled structure, with many folds in its inner 

 wall. In diameter it measures .146 millimeter, and is five or 

 six times as long. 



Specific diagnosis of Renifer megasorchis: Slightly lanceo- 

 late, semicylindrical worms, 5 millimeters long, 1.72 milli- 



