103 Messrs. Alder and Hancock on some new species 



IX. — Notice of some new species of British Nudibranchiata. 

 By Joshua Alder and Albany Hancock. 



Several new species of Nudibranchiate Mollusca have occurred 

 to us during the last two or three years, descriptions of which 

 we had hoped before this to have published elsewhere. Unavoid- 

 able circumstances have delayed the publication ; and as some of 

 the species are the discoveries of friends, who have kindly placed 

 them in our hands for description, we consider it due to them as 

 well as to ourselves not to delay any longer the announcement 

 of these acquisitions to the British fauna, some of which are of 

 considerable interest. 



Doris Zetlandica. 



White r cloak with large, soft, conical, pointed, unequal tuber- 

 cles : dorsal tentacles linear : oral tentacles tubercular : branchial 

 plumes 6, bipinnate, retractile within a cavity. Length y%ths 

 of an inch. 



A single specimen of this new Z)ons was found in Shetland by 

 Mr. Barlee in 1849. It differs from all the other British species 

 with retractile tentacles in the form of the tubercles ; but the 

 most remarkable difference is in the character of the tongue, 

 which is covered with long, linear, subclavate spines, denticu- 

 lated on the inner margin. 



Doris millegrana. 



Yellow or orange ? : clo'ak covered with minute granular tuber- 

 cles : oral tentacles linear : branchial plumes 6, bipinnate, retrac- 

 tile within a cavity. Length 1^ inch. 



Two specimens of this Doris, which we do not find before de- 

 scribed, are preserved in Dr. Leach's collection in the British 

 Museum. They were sent from Torbay by Mrs. Griffiths. The 

 species comes nearest to D. Johnstoni in the character of the 

 tubercles, but differs from it in having only six plumes, which 

 do not form a distinct cup. The tongue resembles a good deal 

 that of D. tuberculata, having stout, smooth spines ; but in this 

 species five or six of the extreme lateral spines are minutely pec- 

 tinated, which is not the case in D. tuherculata, nor in D. John' 

 stoni, though in the latter the spines are also of two kinds. We 

 have been aware of the existence of these specimens in the Bri- 

 tish Museum for several years, but hoped before this to have 

 n)et with the species in a living state. Having failed in doing 

 so. Dr. Gray has liberally allowed us to examine and describe it 

 from the spirit specimens. There can be no doubt of its distinct- 



