The nervous system and subradular organ in two genera of Solenogastres. 407 



have any other destination. In a species of Neomenia from Hawaii 

 a similar nerve is present that passes backward and terminates in the 

 body wall at a point a short distance dorsal to the cloacal opening. 

 No dorsal sense organ has been discovered in Neomenia and it is 

 possible that the region innervated by this nerve is to be considered 

 the equivalent of this sense organ in other forms, it being in a diffuse 

 condition in this genus. The other nerves leading from the latero- 

 dorsal ganglia have been traced to the cloaca, the reproductive organs 

 and the body wall. 



In RJwpalomeuia (Figs. 2, 6) the pedal cords continue with even 

 calibre the entire length of the animal. In the region of the re- 

 productive organs they gradually assume a more dorsal position and 

 unite with the palliai cords; or more strictly speaking the pedal and 

 palliai cords are posteriorly united by one or two short connectives 

 whose boundaries are not sharply defined. In Fig. 2 their union is 

 effected some distance anterior to the palliai commissure. The last 

 pedal commissure is located at a level corresponding to the union of 

 the oviduct and pericardium. Pallio-pedal connectives are difficult to 

 demonstrate with certainty owing to the abundance of muscle and 

 connective tissue. Fig. 6 gives the results of the dissection of one 

 specimen and Fig. 2 (posterior half) was carefully reconstructed from 

 sections. The two superior ganglia are united by a strong commissure 

 which in the mid-line gives rise to a nerve that unites with the dorsal 

 sense organ and apparently some of the neighboring muscles. In one 

 specimen (Fig. 6) a heavy nerve originates at the termination of the 

 pedal cords and is distributed to the body wall, the cloaca and the 

 reproductive organs in the immediate vicinity. In another individual 

 this same region was supplied by several nerves whose roots are 

 shown in Fig. 2. 



