NEOMENIA VERRILLT. 211 



A few small nerves arise from it, but soon become lost to sight in the ventral 

 pharyngeal musculature. The labiobuccal ganglia are sharply defined spheri- 

 cal structures, and each is connected by a dorsal and ventral commissure. There 

 are thus two dorsal and two ventral commissures, but no signs whatever of a 

 subradular complex. This is not surprising as a radula is lacking completely, 

 and a subradular organ, if such exists, is far from being a sharply differentiated 

 structure. 



The nervous system in the posterior end of the animal has been partially 

 destro^^ed so that only the broader features have been worked out. Its gen- 

 eral configuration, however, is essentially the same as in Drepanomenia vam.py- 

 rella. The pedal cords continue to a point about opposite the middle of the 

 cloacal coecum or vagina (Wiren) where they bend abruptly, and coursing 

 dorsally and posteriorly unite with the lateral cords slightly ventral to the open- 

 ings of the coelomoducts into the pericardium. From this point of union, on 

 one side, a heavy nerve, doubtless the dorsal commissure, extends for a con- 

 siderable distance toward the mid line. The commissures uniting the pedal 

 cords appear to be more numerous than the latero-pedal connectives, but beyond 

 this fact no especially interesting features have been observed. 



As usual the animal is monoecious, and in this instance is sexually mature, 

 the swollen gland extending from the pharyngeal region to the pericardium 

 being distended with sex products in all stages of development. Anteriorly 

 the ovo-testis contains sperms only, but a very short distance behind the for- 

 ward tip of the organ ova appear attached as usual to the inner faces of the tubes. 

 The canals leading into the pericardium are comparatively short, though of 

 more than average diameter, and are richly ciliated throughout. As is more 

 fully described in the section on the circulation, the pericardium is provided 

 on each side of the body with two relatively wide diverticula with which the 

 coelomoducts connect. The reno-pericardial openings are unusually wide 

 and conspicuous, and are further distinguished by being surrounded by cells 

 of greater height than is encountered elsewhere in the pericardial wall and 

 by bearing a ciliated coat. 



The upper section of each coelomoduct, pursuing its way anteriorly to 

 the region of the seminal receptacle, is of more than ordinary length and is 

 fashioned into a number of short turns (Plate 3, fig. 4) that give it a some- 

 what compUcated appearance in cross section. Throughout its entire extent 

 each canal is provided with a dozen or more high, longitudinal ridges sup- 

 ported by muscle and connective-tissue fibres penetrated in many instances 

 by blood sinuses. The component epithelial cells are relatively slender, of 



