142 PROCEEDINGS OF THE ACADEMY OF [March, 



The oviduct (Ov), the more dorsal of the two branches, comprises 

 three main divisions, of which the first is relatively the most slender 

 and forms a highly convoluted mass at the anterior end of the gonad 

 at a somewhat higher level than the remaining elements of the 

 accessory reproductive apparatus. This first section passes abruptly 

 into the second, which is characterized by a greater diameter, much 

 more highly developed muscular walls, and a more open arrangement 

 of the coils. Near its union with the third division, comprising the 

 albumen and mucous glands, it communicates with a slender seminal 

 receptacle (Sr), empty in all of the dozen specimens examined. The 

 mucous gland (Mu) is considerably larger than the albumen, w^ith 

 relatively smooth, thin walls thrown into gentle folds internally. 

 The albumen gland ( Al) , on the other hand, is externally folded to a 

 conspicuous degree, especially in its distal half. It communicates 

 at its base with the mucous gland, and the secretory products from 

 both make their way by a common canal which unites with the main 

 section of the oviduct close to the external reproductive opening. 



The vas deferens (Vd) enters almost immediately a compact gland, 

 possibly functioning as a prostate, by means of several slender ducts 

 which communicate in turn with numerous blind, finger-shaped 

 hollow processes (Pa). Sections show these follicles to be composed 

 of large, highly glandular cells, from many of which the secretion is 

 in the act of escaping in the form of a finely granular colorless product. 

 In some instances the hermaphroditic duct and the adjacent section 

 of the vas deferens contain multitudes of spermatozoa; none occur 

 in the supposed prostate. Beyond the prostate gland the vas 

 deferens proceeds as a uniformly slender, much convoluted tube 

 located immediately in front of the prostate. Distally it opens into 

 the penis, a thick-walled, twisted structure communicating with the 

 exterior by means of a pore immediately anterior to that of the female 

 reproductive opening. A retractor muscle attaches to the base of 

 the penis, and extending posteriorly divides, each half becoming 

 inserted in the body wall about opposite the lateral border of the foot. 

 The central nervous system, presenting the highly compact 

 appearance of the seolids in general, rests upon the dorsal surface of 

 the esophagus or pharynx a short distance in front of the anterior 

 border of the stomach. The cerebral ganglia are in close contact 

 along the mid line, and posteriorly are closely united with the pleural 

 ganglia. The lateral portions of the cerebral moiety are prolonged 

 into short horns. On each side of the mid line a short connective 

 leads from the posterior border of the cerebral ganglion and unites 



