ANATOMY OF ACLESIA FREERI. 89 



Plate VI. 



Fig. 33. Nervous system of Aclesia freeri. sp. nov. 



1, nerves to central and inner parts of the pharynx. 

 2 and 3, nerves to lateral surface of pharynx. 



4, nerve to external circular muscle of pharynx. 



5, nerve to posterior and ventral surface of pharynx. 



6, nerve to lips and anterior part of head. 



7, nerve to salivary gland. 



8, penial nerve, supplying penis, retractor penis, and the body 



wall in the vicinity. 



9, 10, 11, 12, 14, and 15, nerves passing to body wall, parapodia, 



and lateral part of foot. 

 13, the index line is directed to the point where a nerve (24) to 

 the central portion of the foot emerges from beneath the 

 pleural ganglion. Its origin is from the ventral surface of 

 the pedal ganglion. 



16, principal pedal nerve. 



17, genital ganglion. 



18, nerve to sperm-oviduct. 



19, small ganglion on ventral surface of sperm oviduct. 



20, continuation of trunk of genital nerve. 



21, ganglion situated on the rectum, about 7 millimeters from the 



anus. 



22, intestinal nerve. 



23, nerve arising from visceral ganglion, which passes to the 



rectal (anal) ganglion. 



24, pedal nerve to central portion of foot. 



25, corresponding nerve of left side. 



26, nerve traced to spermatheca and pericardial wall. 



27, osphradial ganglion. 



28, branchial nerve. 



29, ganglion situated beside the spermatocyst. 



30, ganglion situated at the crossing of the hermaphrodite duct 



and the oviduct. 

 30', nerve to oviduct (albumen gland) . 

 30", nerve following the hermaphrodite duct to the hermaphrodite 



gland. 



31, nerve to region around the mouth. 



32, nerve to oral lobe. The branch on the other side of the fork 



passes to the integument of the anterior part of the head, 

 dorsal to the mouth. 



33, tentacular nerve. 



34, main trunk of nerve passing to the oral region. 



35, stomatogastric nerve. 



36, rhinophoral nerve, ending in ganglion from which numerous 



fine nerves arise. 



37, nerves to anterior portion of foot. 



38 and 39, nerves to left body wall and parapodia. 



40, left pedal nerve. 



cr. h. c, cerebro-buccal connective. 



cr. gn, cerebral ganglion. 



p. gn. R, right pedal ganglion. 



