118 MESSRS. ALDER AND HANCOCK ON 



branches : they are retractile within a cavity, the margins of which are divided into six 

 angular lobes : the plumes correspond to the spaces between the lobes. Foot oblong, 

 rounded at both ends, with a shallow notched lamina in front ; white, the upper side 

 beautifully lineated with brown ; the under surface plain, with a few faint lines towards 

 the centre. Length upwards of 4 inches. 



Tongue as in D. tuherculata -. no collar. 



Boris striata, Kelaart in Journ. Asiatic Soc. (Ceylon Branch) 1858 ; idem in Ann. Nat. 

 Hist. 3rd ser. vol. iii. p. 302. 



Doris striata comes very near to the D. cruenta of Quoy and Gaimard, but wants the 

 large red blotches which distinguish that species. Kelaart's specimen measured only 

 an inch and a half long. Our animal, however, agrees so well with his drawing and 

 description that we have no hesitation in considering it the same. 



There are two specimens of this species in the collection. It is not very common. 



Doris concinna, n. sp. (PI. XXVIII. figs. 4, 5, 6.) 



Body oval, rather convex, brownish. Cloak with smallish, conical, finely pointed 

 tubercles, rather soft and much attenuated towards the margin, placed a little apart with 

 small ones interspersed ; it is yellowish or reddish brown, sometimes inclining to grey, 

 with large dark blotches (often rather obscure) on the sides of the back, and spotted 

 with brown over the whole surface. Under side pale yellowish brown, irregularly 

 spotted with dark brown, and minutely reticulated with white. Dorsal tentacles clavate, 

 brown. Oral tentacles pointed. Branchial plumes six, quadripinnate, yellowish brown, 

 with darker brown freckles ; the margin of the cavity slightly raised. Foot broad, 

 grooved and notched in front, of a yellowish or reddish brown, freckled with a darker 

 shade of the same colour ; the upper surface paler, with dark brown spots. Length 

 from 24 to 3 inches. 



The young is paler and more minutely spotted. 



Spicula small, pointed, a little bent, arranged in a reticulated manner, and in bundles 

 at the base of the tubercles. 



The tongue is similar to that of D. tuherculata ; but the mouth is also supplied with 

 a prehensile collar. The spawn is riband-formed, with the free margin sinuous, forming 

 one or two irregular coils. 



This is a common species. 



Doris fragilis, n. sp. (PI. XXVIII. figs. 7, 8.) 

 Body broadly oval, depressed, brownish. Cloak ample, firm, covered with minute, 

 somewhat scattered, spiculose, blunt tubercles, of unequal sizes, rather paler than the 

 ground — which is yellowish brown, beautifully marbled with darker brown and white, 

 and covered with minute dark freckles ; under surface strongly blotched with reddish 

 brown, the blotches becoming confluent near the foot and fewer towards the margin, 



