354 NOTES ON SOME IIKITISIE NUDIBRANCHS. 



matter of some doubt. Perhaps Trinchese's two species are distinct, 

 and perhaps his Govia viridis is identical with liotli Doto uncinfita and 

 II((ncnckii( docti/lotc, so that the genus niny be tabuhitoil as follows: — 



1. Ifaiicockia dadylota, Gosse, S. England. 



2. //. uncinata (Hesse), Brest. 



3. H. viridis (Trinchese), Mediterranean. 



4. If. rubra (Trinchese), Mediterranean. 



Hesse regarded his si)ecimen as a Doto, and I'ergh somewhat doubt- 

 fully refers the genus to the Dotonidie. It would seem to be inter- 

 mediate between that family and Lomanotus. Tiie narrow radula 

 indicates affinity to Doto and the true yEolids. The cerata show analo- 

 gies to those of Doto, though they have not their characteristic shape. 

 But the perfoliations on the rhinophores, the processes on the oral veil, 

 and the manner in which the cerata arise from the dorsal margin recall 

 the characters of Lomanotus rather than of Doto. 



HANCOCKIA DACTYLOTA, GOSSE. 



(GossE, "On Hancockia dactylota," Ann. Mag. Nat. Hixt., ser. 4, xx., 

 1877, pp. 316-19. Gamblk, "On two rare British Nudibranchs, Lomanotus 

 genei and Tlancockia dactylota," ib., 6, ix., 1892, pp. 378-85. TiONonKSE, 

 " Ricorche anatom. sul gcnerc Govia," Metn. della R. accad. delle set. deW 

 ixiituto di Boloi/na, scr. 5, vii. pp. 183-91, 1886. BEROii, Si/stein der Nudib. 

 Gast., p. 1048, 1892, sub voce Govia.) 



Two specimens labelled " I'lymouth district, Sept. '97 and '98." 

 They are of much the same size, one being rather more elongate than 

 the other. Measurements in millimetres : — 



Length. Breadth. Height. 



(1) 7 ... 1-2 ... 2 



(2) 6 ... 1-5 ... 2 



The colour is greyi.sh green, and the shape rather stifl' and rectan- 

 gular. The animals are not very well preserved either externally or 

 internally ; but a small specimen subsequently given me by Mr. Allen 

 proved to be in better condition and was sectioned. 



The foot is truncate in front; no groove is visible on the anterior 

 margin ; the tail is not pointed beliind, and is slightly bifid. 



The oral veil is smooth in the middle and curves inwards, but the 

 two sides are much expanded and each bears four digits, of which the 

 second from the inside is the longest. The rliinophore sheaths, which 

 are set on the dorsal margin, are about 1 mm. liinh ;ind 5 mm. broad, 

 straight, cylindrical, not expanded at the top, but divided into eight to 

 ten low lobes. The upper part of the rhinophores is a smooth column ; at 

 the base are a few obliquely vertical perfoliations. From the rhino- 

 phore sheaths runs backwards a not very distinct marginal ridge, on 



