1917.] NATURAL SCIENCES OF PHILADELPHIA. 147 



ventral face of the cerebral ganglia. The stomach is supplied with 

 at least three pairs of nerves having their origin in the buccal system. 

 The liver pouches and gland itself likewise derive their nerve supply 

 from the buccal nerve complex. From the same source a nerve on 

 each side of the intestine forms a plexus throughout the length of the 

 gut, and ma}' connect with branches (P2c) from the pedal ganglia 

 or with others (P13) from the pleural. The reproductive apparatus 

 is abundantly supplied with branches of the nerve G having its 

 origin in the right pleural ganglion. In two specimens there were 

 faint indications that delicate twigs from this same source enter 

 the heart and renal organ, but this was not definitely determined. 

 A brief diagnosis of the present species is herewith appended. 



Genus CHIOR^RA Gould. 



A description of the genus is given in the opening paragraph of 

 the present paper. Type of the genus C. leonina. 

 Chioraera dalli new species. 



Body limaciform, smooth and of a pearly color without definite 

 signs of pigmentation. Head enormously developed, with the mouth 

 near the posterior margin. Dorsal tentacles simple leaf-like expan- 

 sions without special sheath. Jaws, radula and salivary glands 

 wanting. Total length three inches. Off the coast of British 

 Columbia, in shallow water. 



It is with great pleasure that I associate the name of this species 

 with that of the renowned student of west-coast conchology, Dr. 

 W. H. Dall. 



Abbreviations Used in Figures. 



Al albumen gland. Ov oviduct. 



B buccal ganglion. P pedal ganglion. 



Bi intestinal nerve. PI, P2, P3, P4 pedal nerves. 



C ♦cerebral gan lion. Pa prostate gland. 



Cl, C2, C3, C4 cerebral nerves. Pc pedal commissures. 



Cx cerebro-esophageal Pe pericardium. 



nerve. P pleural ganglion. 



G visceral nerve. PU, P12, P13, P 4 pleural nerves. 



Lp liver pouch. Sr seminal receptacle. 



Mu mucous gland. Vd vas deferens. 



Ot ovotestis. 



Explanation of Plates XI, XII, and XIII. 



Plate XI. — Fig. 1. — Chioroera dalli, ventral view. 



Fig. 2. — Dorsal view of head, showing its innervation. 



Fig. 3. — Side view of entire animal. Anal opening, near which is excretory 



pore, replaces lappet; left one shown in stippled outline. 

 Fig. 4. — Side view of alimentary canal and digestive gland. 

 Fig. 5. — Left side of body, showing distribution of pedal nerves. 



