58 PROCEEDINGS OF THE CALIFORNIA 



of Aph/sia, I cannot at present determine whether there are many other differ- 

 ences in structure. 



The stomach was full of large fragments of Alga,. I found three specimens 

 only, on the beach at San Pedro, July 25th, just after a heavy blow which 

 occurred at the lowest summer tides. Kept in water for some time, they 

 were very slow and uninteresting in movements, showing no evidence of any 

 means of defence except the exudation of a beautiful purple fluid from the 

 mantle when handled. This fluid, common to the Aplysias, though formerly 

 supposed to be poisonous and indelible, possesses no such properties, though it 

 may be a defence against marine animals which attack them. 



The figure, taken from a tracing of the shell, and electrotyped by Dr. A. 

 Kellogg, represent the inner surface of the most developed specimen, of the 

 natural size. 



Navarchus, Cooper, Proc. Cal. Acad. Ap. 1863. 



N. inermis Cooper. 



Syn. Strategus inermis Cooper, Proc. Cal. Acad. II, 1862, p. 202. 



One small specimen, dredged among seaweeds in ten fathoms, near the east- 

 ern shore of the " Isthmus," Catalina Island, shows no variation from those 

 obtained at San Diego. 



Doris, Linn. 



D. albopunctata Cooper. State Coll. Species 1000. 



Form ovate, pointed behind, flattened, surface shining, minutely rugose. Ten- 

 tacles club-shaped, retractile, branchial plume, 6-8 parted, bipinnately divided, 

 situated near the posterior extremity. Color yellow or orange brown, dorsal 

 surface thickly speckled with small white dots, each forming a slightly raised 

 papilla. Beneath paler. 



Dredged from a rocky bottom in twenty fathoms, a mile from the shore at 

 Santa Barbara. Also found on rocks at low water mark near the north-west 

 end of Catalina Island. 



Length about one inch, breadth one-third of an inch. 



Doris montereyensis Cooper, Proc. Cal. Acad. II, 1862, p. 204. 

 Found at Santa Barbara Island on rocks at low water, differing from the 

 original specimens only in larger size and deeper color. The tentacles are club- 

 shaped, the branchial 7-8 parted, bipinnate and from one opening. 



Doris sanguined Cooper, loc. cit. (Asteronotus.) 

 Four specimens found with the last, differ from the type only in having the 

 black spots very small. The tentacles are acute, cyliudro-conic, retractile into 

 a cavity bordered by a toothed membrane. The branchiae form an erect chim- 

 ney-shaped expansion. I cannot discover the slellate valvular structure of the 

 branchial opening, which characterises the genus Asteronotus, in these specimens. 



Doris Sandiegensis Cooper, loc. cit. 

 Two found with the last agree exactly with specimens from San Diego. The 



