226 G. A. and W. G. MacCallüm, 



muscle fibres with perhaps a few circular fibres externally. The 

 Pharynx which is closely approximated to the mouth cavity is 

 surrounded by a thick connective tissue merabrane but is rather 

 cellular in its structure and not powerfnl. The lumen is laterally 

 flattened. Tlie intestinal coeca which are smooth in outline as far 

 as they can be traced run back laterally to near the level of the 

 foot. They are extremely thin walled and no epithelium is 

 apparent 



The male genitalia consist of a complicated ejaculatory appa- 

 ratus and a number of testicular lobules. There are about twenty 

 of these lobules situated in the median portion of the body and 

 extending back to about the level of the beginning of the caudal 

 disc. There is a tortuous tubulär vas deferens running dorsally 

 from about the region of the ovary forward to enter the hinder 

 end of the cirrus sac. This ejaculatory structure is composed of a 

 long club shaped thick-walled muscular sac the orifice of which lies 

 far anteriorly in the median ventral line a short way behind the 

 pharynx and a considerable distance in front of the opening of the 

 Uterus. Within the cirrus sac is the penis proper which consists of 

 a posterior membranous sac, a middle muscular portion and an 

 elongated anterior part which is eversible, and is covered with flne 

 beut spines which when everted point backward. 



There is a sort of uterine cloaca opening also in the median 

 line ventrally and posterior to the male genital opening. This is 

 quite deep and at its inner end suddenly narrows like a test tube 

 and connects with a narrow tube which is probably the uterus 

 proper. The peripheral or cloacal portion is lined at its inner end 

 by a thick layer of spicules which are closely packed together and 

 difficult to distinguish separately. They shine through appearing as 

 a rosette when one views the whole worra, and form a most con- 

 spicuous feature. Behind this sac there is sometimes another thin- 

 walled sac like a spermatheca. The ovary is a coiled tubulär organ 

 giving off an oviduct which is joined by the common yolk duct after 

 which it enters the posterior end of the straight uterus. The yolk 

 ducts are plainly seen running far forward. We can make out no vagina. 



A special note may be devoted to the clinging organs of the 

 posterior foot since they are most characteristic. As stated above, 

 about half of them occupying one side of the foot are like tongs in 

 their form with long rods of chitin corresponding to the handles of 

 the tongs. Jointed to the ends of these are broad Hattened blades 



