OP CONCHOLOGY. 11 



DESCRIPTIONS OF NEW SPECIES OF NUDIBRANCHIATE 

 MOLLUSCA INHABITING POLYNESIA. No 2. 



BY W. HARPER PEASE. 



Doris villosa, Pease. PI. 3, fig. 1. 



Animal coriaceous, oblong oval, rounded at either end, convex 

 above, covered with crowded, erect, elongate, conical papillse, 

 which to the touch resemble the pile on velvet. 



Dorsal tentacles small, elongate oval, peduncles long, and 

 retractile into tubular cavities. Labial tentacles small, cylindri- 

 <cally tapering. 



Branchial star large, wider than the mantle, encircling the 

 vent, except on its posterior side ; plumules six, quadripinnate, 

 retractile into a minute cavity. Foot elongate, rounded behind, 

 truncately rounded in front, which part has a marginal transverse 

 iissure. 



Color pale grey, darker centrally, and obscurely maculated 

 with rather close, irregular, dusky brown spots. Tentacles and. 

 margins of plumules pale olivaceous. Under surface pale, and 

 closely dotted with brown. 



Length, two and seven-tenths inches. 



Habitat, Island of Huaheine. 



Station, (lurking among sea-weed, in the upper region of the 

 laminarian zone. Like most of the coriaceous species, it is very 

 sluggish in its movements. A. G.) 



Doris debilis, Pease. Plate 5, fig. 2. 



Animal smooth, subpellucid, oblong, slender, the anterior 

 half slightly the narrowest, rounded at either end, margins 

 broadly undulated. 



Branchial star inserted far back, a short distance from the 

 posterior end of the mantle ; very large, extending over the 

 sides of the mantle; consisting of six plumules, the four ante- 

 rior simply quadripinnate, the posterior pair composed of three 

 <quadripinnate plumules, attached to one base, all retractile into 



