80 



Journal of Entomology and Zoology 



denticular pouch, serving the complicated musculature ol the four 

 pairs ol maxillae. 



The inner paii- of visceral nerves form the superpharyngeal ner- 

 vous system. Near where they branch ofll from the outer pair they 

 parth anastomose, interchanging a few fibers, Inn with no attendant 

 ganglionic structure. I he anastomosis continues for a distance ol 

 .16 mm. and then the nerves separate, assuming a diameter ol .•'- 

 mm. ami run parallel about - 1 mm. apart lor a distance ot 1.3 mm. 

 As the) do this the) bend dorsall) so that they are deeply embedded 

 in the upper wall ol the denticular pouch and arc quite dorsad ot the 

 maxillar) musculature. I his brings them to where the intestine 

 folds oil from the dorsal side ol the denticular pouch. The nerves 

 bend still more dorsad and become embedded in the intestinal epi- 

 thelium. 1 [ere the) become enlarged b\ ganglion cells and separat- 

 ing (Pig. 4; p), go around the mouth ol the intestine proper and 

 come together in the \ entral wall ol tins structure. Just before their 

 second anastomosis the) send ofll two branches into the lateral and 

 dorsal walls ol the intestine. I iuse nerves and the one into which 

 tic main pair discs extend back along the intestinal wall lor a short 

 distance. 



An interesting observation was made on the muscle which acts 

 on the mandil les. It is a long spindle-shaped muscle reaching from 

 the back of the pharynx to the mandibles. These bifurcate black 

 chitinous plates arc in apposition to the slit { Fig. 4; 6), whose walls 

 are armed with the maxilla' and form the denticular pouch. I he 

 mandibles are bound to the walls ol this slit In small muscles used 

 in prehension. Now the members ol this group that has the denti- 

 cular pouch y\o nol complete!) evert their pharynx in the act ot pre- 

 hension, rhey merely, from what observations 1 have been able 

 to make o\\ the Eunieidae .\'u\ ou this form, push out the mandibles 

 and the forceps law ol tic maxillae. I here is no proboscoideal 

 musculature, such as is found in Phyllodoce, Glycera and Nereis. 

 which functions from the inside and by contracting, turns the pro- 

 boscis inside out. To take the place ol the muscles which evert the 

 proboscis b\ contracting and pulling it out we have in this form a 

 muscle which, acting on the mandible forces this and the forceps 

 teeth ol the maxillae out and does so, paradoxical as it may seem b\ 



