662 SIR c. ELIOT ON NUDiBRANCHS [June 19, 



As Bergh observes, it is somewhat doubtful if this is merely a 

 variety of JDoridopsis tuherctdosa or a new species. I have a 

 specimen captured by Mi-. Gardiner at Rotuma, which is of a 

 uniform brownish yellow without a ti'ace of spots, but in other 

 respects apparently a typical Doridopsis Puhercidosa. 



DoRiDOPSis DENisoNi (Angas). 



{Dorisdenisoni Angus, "Descrip. d'especesnouv. deMoll. nud.," 

 J. de Oonchyl. 3 ser. iv. 1, 1864, p. 45. Doridopsis denisoni 

 Bergh in Semper's Reisen, xv. p. 694, ff. Doridopsis 

 gemmacea A. & H. 1. c. p. 126, and Hancock, "Anatomy of 

 Doridopsis.") 

 According to Bergh, Angas's name has a few months' priority 

 over Alder and Hancock's D. gemmacea. 



The three specimens ai-e not veiy well preserved, but appear 

 to agree with Alder and Hancock's two descriptions cited above 

 both externally and internally. 



The mouth-gland is large and consists of many finely divided 

 lobes. The liver is flattish, much lobed, and deeply cleft behind. 

 No hooks or spines could be found in the male genitalia, although 

 they are no doubt really present. The vas deferens is extremely 

 long and elaborately coiled. 



Doridopsis atromaculata A. k H. 



(A. & H. 1. c. p. 129; and Hancock, "Anatomy of Doridopsis," 

 p. 193.) 



One specimen, rather well preserved. It is as described by 

 Alder and Hancock, though the sti'ueture of the mouth-parts is 

 obscured owing to this portion of the body having been opened. 

 Superficially the back appears to be white with black tubercles, 

 but on a closer examination it is seen that the whole surface is 

 studded with groups of tubercles, or with compound tubercles, 

 which are in some places white and in others black. Even in the 

 black regions the tips of the tubercles ai'e whitish. 



The structure of the branchia is remarkable. The plumes arise 

 fi'om a large common ring which, as pi'eserved, projects con- 

 siderably above the edge of the bi'anchial pocket. Three of them 

 are tripinnate, elongate, but not very ample ; in position they 

 are right, left, and posterior. The anterior pai-t of the ring bears 

 a number of small inconspicuous bipinnate plun\es, and there are 

 a few more between the left and the posteiior plumes. The 

 right and postei-ior plumes are close together, the arrangement 

 not being quite synimetrical. The large anal papilla lies some- 

 what to the left of the centre of the ring. 



Doridopsis punctata has also only three branchiae, but the 

 ari'angement is difierent, the plumes being tripinnate and faiily 

 ample, without intermediate smaller tufts. 



Hancock's statement that " the pi'oboscis is quite slender and 

 tapers imperceptibly into the ci-op " I'aises a doiibt if the animal 

 may not really be a DoriopsiUa (see below). 



