205 



fhird of the body like an umlirella. Mouth, prohoscidiform, wltli 

 two short lateral tentacles. Length, 3i mches ; breadth, 21 mches ; 

 height, i an inch. 



Numerous among grass on mud flats in San Diego Bay at or near 

 low water mark, from November to May ; but many were destroyed 

 by the fresh water flood of January. A very active and interest- 

 ing species for the aquarium. 



None of these species of Doridae seem to agree exactly with the 

 descriptions of the genera as divided up by the latest authors ; and 

 further generic names may be required when oppoi-tunities of study- 

 ing the living animals are presented. At present, the names and 

 descriptions here given will sufHce for identifying the species. The 

 same remarks will apply to the Molidae, next described. 



JEolis {FlabelUna?^ opalescens, n. sp. 



Spec. char. — Bluish white, pellucid, somewhat quadrangular, pos- 

 teriorly wedge-shaped ending in a sharp point. Foot anteriorly 

 with two short spreading appendages, laterally thin and flattened. 

 Head short ; tentacles two, long, acute, (the lower pair replaced 

 bj the appendages of the foot.) Two erect, elul>shaped append- 

 ages (dorsal tentacles) on the anterior pai-t of the back, of an 

 opaline color, with an orange stripe between them. Branchiae in 

 five pairs of fascicuh along the upper edges of back, each bundle 

 of about four rows, longest above their color yellowish, with a pur- 

 ple or blood-red spot near the end. A rosy tint often visible from 

 the string of ova sliining through the abdominal walls. 



This elegant species is numei'ous in San Diego Bay m the wni- 

 ter, living among the grass, and depositing its ova on any fixed 

 object it meets with. Length, 1^ in., breadth, i inch. 



^olis (^Phidianaf^ iodinea, n. sp. 



Spec. char. — Rich violet purple, narrow wedge-shaped, high in 

 front, tapering to an acute point behind, shghtly constricted in five 

 pai'ts of the body corresponding to divisions of the branchiae. Foot 

 very narrow, shghtly expanded. Head obtuse, with fjur tentacles, 

 the upper longer and turned" upward, the lower deflexed. Two 

 club-shaped, orange-colored appendages a little behind the upper 

 tentacles. Branchiae short in a double row, close together near the 

 median line, their color, orange red. Length, 2^ inches ; breadth, 

 one fifth of an mch. 



On rocks, among algse outside of San Diego Bay. Rare inside. 



Pkoc. Calijforkia Acad. Nat. Sci. Jan., 1863. 1 ( 



