122 Illinois State Lahomfonj of Natural History. 



divisions being o£ nearly equal length. The third region, the 

 digestive stomach of Bourne, is large and thin- walled, its cavity 

 presenting about four regular constrictions, and its mucous 

 membrane being conspicuously and finely rugose. The next 

 section, the intestine proper, is smaller, with minute, irregular, 

 and much less conspicuous rugosities ; while the last section, 

 the rectum, is about the diameter of the stomach, with a 

 smooth mucous membrane. It passes backward without nar- 

 rowing, rapidly rounding directly into the large anus. 



The testes are ten in number in the specimens examined. 

 The penial sheath is very long, extending from opposite the 

 seventh ventral ganglion (where it is surrounded by the 

 glandida prostatica) backward to a point opposite the ninth 

 gauglion. Here it bends abruptly forward upon itself and 

 passes to its external opening beneath the sixth ganglion. 

 Immediately in front of the glandida prostatica lies the 

 glandular part of the seminal vesicle of the left side, that of 

 the other side being just opposite. Forward from this runs the 

 thick-walled, shining ductus ejaculatorius, continued pos- 

 teriorly as a slender, somewhat contorted tube which meets its 

 fellow of the right side as this comes under the nerve cord just 

 behind the sixth ganglion, the two then running in company 

 to the base of the penial sheath. 



The ovaries are small, nearly spherical, and lie closely 

 approximated on each side of the nerve cord, immediately be- 

 hind the seventh ganglion. The common oviduct passes first 

 through a pyriform (jlanduhi albucjinea^ the apex of which 

 reaches backward to the eighth ganglion, and then, at first 

 small but presently much enlarged, runs backward somewhat 

 deviously to the ninth ganglion, where it turns directly forward 

 and continues unchanged to its orifice. 



The subd'sophageal ganglion is closely approximated to 

 the nest behind, the second and third ganglia are about half as 

 far apart as the third and fourth, and these about two thirds 

 the distance of the fourth and fifth. The last four ganglia 

 are likewise much approximated, the posterior one being very 

 large, and sending off several pairs of branches. 



