OF CONCIIOLOdY. 207 



tacles. Color, lobes olivaceous, clouded with olive-brown ; 

 cervical tentacles pale, pellucid, olivaceous, freckled with 

 dusky ; foot pale olivaceous, punctured with white and dusky. 

 Length 8 inches. 



Genus CHROMODORIS, Alder and Hancock. 



This genus, established by Alder and Hancock, is repre- 

 sented on the islands of the Pacific by a large number of 

 species. To it should be referred Doris dorsalis, Gld. ; also 

 I), decora and D. marginata, Pse. Proc. Zool. Soc, 1860. 



The species deviate but little from the generic type, and 

 fully confirm the genus. The body is elongate, somewhat 

 slender, slightly dilated anteriorly and rounded posteriorly. 

 The foot is narrow, extending some distance beyond the man- 

 tle posteriorly, and usually tapering to a point. The tentacles, 

 as Avell as the branchiae, are retractile ; the latter are small, 

 not extending over the edges of the mantle. All the species 

 are lineated or marginated with bright colors, but seldom 

 spotted. 



Genus ACLESIA, Rang. 



Having had opportunity of examining several species of the 

 above genus, we learn that they deviate but little from a com- 

 mon type. They are distinguished chiefly by the cirrhi which 

 are spread over their bodies, and the ocellated spots, usually 

 of blue or greenish centres, with which they are painted. 

 (Colors and the style of their distribution may be classed as 

 generic characters in many of the groups of Nudibranchiata.) 

 They are gregarious in their habits, and live on sea weed. 

 The corners of their heads, consequently, assume a tentacular 

 form, quite elongate on some species, to enable them to grasp 

 the sea weed ; while at rest, they are withdrawn and the head 

 is round or slightly dilated. Slylocheilus, Gld., we consider 

 synonymous with this genus. The notes of Quoy and Gai- 

 mard on A. longicauda agree with our observations, and the 

 drawing furnished Dr. Gould was taken, as they state, from 

 the animal in motion. 



ACLESIA PRODUCTA, Pse. 



Description. — Animal elongate, subpellucid, smooth ; cirrhi 

 remote, simple or branched ; lobes short and rounded about 

 midway between the end of the foot and the head. Branclme 

 large, arborescent, exposed ; vent prominent; tentacles long, 

 rather slender, of nearly equal length, the upper pair truncate 

 and grooved laterally half their length ; lips furnished with 

 lateral tentacular lobes ; eyes rather nearer to the posterior 

 than anterior tentacles ; foot narrow, elongate. Color pale 



