126 DR. CUTHBERT COLLINGWOOD ON SOME NEW SPECIES OF 



Order NUDIBBANCMIATA, Cuvier (1817). 

 Family DORIDIDiE, Alder and Hancock (1855). 



Genus Doris, Linnaeus (1758). 



Doris pecten, Coll., n. sp. (Plate IX. figs. 1-5.) 



Length nearly -^ inch. Body oval, of a deep greenish-blue colour all over, studded 

 with minute papillae of a darker tint. Mantle large, covering the foot entirely. Dorsal 

 tentacles short, lamellated, dark-coloured, paler at the bases. Branchial, consisting of 

 seven or eight simple leaflets, are ranged in a crescentic form, the horns of the crescent 

 pointing forward and embracing a small crescentic area of a paler tint. Under surface 

 of the mantle paler than the upper, and spotted ; foot brownish below. 



Two specimens of this little Boris were found in a rock-pool above low-water mark on 

 Bush Island, entrance to the harbour of Ke-lung, North Formosa, May 29. When at 

 rest, the posterior part of the mantle is drawn in, and the branchiae are seen in profile, 

 looking like a comb stuck in behind, whence its specific name. 



Doris crescentica, Coll., n. sp. (Plate IX. figs. 0-8.) 



Length 3 inches ; breadth 2 inches. Body broad, flat, tubcrculated. Mantle capa- 

 cious, covering the whole body, and largely projecting beyond the posterior extremity of 

 the foot ; very broad and round anteriorly, but about the middle of the body constricted 

 on either side to about one half its diameter ; edge very thin and flat, and puckered all 

 round the margin with numerous large and small folds. Plentifully covered with large 

 warty excrescences arranged crescentically and concentrically around the anterior and 

 posterior margins, where they are but slightly elevated : an elongated irregular excrescence 

 runs along the centre of the dorsum, commencing anterior to and between the tentacles, 

 and terminating at the branchiae,on cither side of which are arranged large irregular bosses 

 a quarter of an inch high. On either side of the branchiae there is a plain and thinner 

 irregular portion, larger on the left than on the right side. Dorsal tentacles large, cluh- 

 shaped, acuminated, and arising from a projecting eye-like sheath with irregular opening; 

 the club-shaped portions laminated, the peduncles smooth. Branchiae, of six compound 

 leaflets, much branched, and arranged in a wide, round, anal orifice ; the plumes nearly 

 equal in size. Mead with two small oral tentacles, concealed beneath the mantle. 



Colour and general appearance. — General colour a brownish olive, the elevations and 

 bosses paler. Upon the large bosses is a tinge of pink, surmounted by a whitish apex ; 

 a similar pink tinge upon the thinner part of the mantle round the margin. The thin 

 non-tuberculated parts of the mantle on cither side of the branchiae straw-colour. Ten- | 

 tacle-sheaths same as the body-colour on which they arc situated, the tentacles themselves 

 somewhat darker. Branchiae pale brown, the stems darker, and the edges of the leaflets 

 whitish. Anal orifice Avhite. Under surface — anterior half of the mantle pale brown- i 

 pink; posterior half yellowish, a broad irregular reddish band immediately surrounding 

 the whole body. 



