PLATE XT. 



Fig, 41. — Nervous system, dissected and viewed from the dorsal side. ■ 2. 

 I. nerve to mandibular muscle. 

 l', pharyngeal commissure. 



3, nerves to mandibular muscle. 



4, pharyngeal ganglion. 



5, outer cerebro-buccal connective. 



6, inner cerebro-buccal connective. 



7, right nerve of the inferior labial lobe. 



8, infundibular nerve. 



9, nerves to digital and superior labial tentacles. 



10, large nerve innervating hood and digital tentacles. 



11, nerve of postocular tentacle; the other branch of this nerve innervates the preocular tentacle and the 



posterior portion of the h 1. ami sometimes digital tentacles. 



11'. cerebral ganglion. 



L3, pleuro-visceral ganglion. 



14, nerves to shell muscle and the body wall. 



15, nerve to the walls of the vena cava, in this ease springing from the visceral nerve. 22. 

 Hi, Nerve- in the spermat< >]>hure sac and the genital duet. 



17, nerve seeming hi go to the posterior wall of the anterior renal sac. 

 IS. nerve seeming to go to the posterior wall of the posterior renal sac. 

 111. posterior branchial nerve. 



20, anterior branchial nerve. 



21, nerve to the wall of the vena cava, in this ease arising directly from the pleuro-visceral ganglion. 



22, visceral nerve. 



'_'.".. nerves from the outer end of the cerebral ganglion to the posterior portion of the hood. 



'-'4, base of the optic nerve, which may be a ganglion. 



25, portion of the optic nerve in the stalk of the eye. 



I'll, branches of the optic nerve ill the capsule of the eye. 



27, nerves proceeding from the cerebral ganglion to tin- dorsal side of the buccal mas-, some being distributed 



to the mandibular muscles, but most passing to the papillre on the edge of the buccal membrane. 

 L's. pedal ganglion. 



29, pedal commissure. 



30, nerve proceeding to the base of the spadix, and there ending in an enlargement from which several line 



nerves go to tin- tissues of the spadix. 



31, nerve to cesophagus. 



32, buccal ganglion. 

 •".:!, buccal commissure. 



.".4. nerve to salivary gland. 



::.">. ganglion of inferior labial lobe (or Van der Hoeven's organ) 

 218 



