158 F. W. GAMBLE, B.SC. 



ordinative movement possessed by these papillae in common with 

 those of the " calyx-sheath " apparently escaped him, and is an 

 additional argument in favour of the view advanced by Mr. Garstang,* 

 that such sheaths contain a " pleuropodial " element." 



Hancochia eudactylota, Gosse. (PI. VII. Fig. 3.) 



A specimen of this species was dredged last summer (1891) on 

 Delesseria in Plymouth Sound, as I have already recorded.! Mr. 

 Hunt, the original discoverer of this form, dredged the only previous 

 British specimen on the same Alga in Tor Bay in 1877. This was 

 described by Mr. Gosse:}: under the name Hancockia eudactylota. In 

 1886 Prof. Trinchese, apparently in ignorance of Gosse's paper, 

 described ("Ricerche Anatomiche sul Genere Govia,"§ 1886), four 

 specimens dredged near Naples, defining them as two species of a new 

 genus, Govia rubra and G. viridis. Although the internal anatomy of 

 Hancochia is unknown, it seems probable that the genera Govia and 

 Hancockia will be united, as indeed has been done by Dr. Norman in 

 his "Revision" (this Journal, Vol. vi., 1890, pp. 79, 80). Cams 

 ('Prodromus Faunas Mediterranean' vol. ii. pt. 1, p. 208) writes the 

 genus Govia, Trinch., adding in brackets {Hancockia, Gosse). 



The Plymouth specimen was about a quarter of an inch in length 

 when expanded. This is only half the length of Mr. Hunt's specimen. 

 Colour a purplish-rose, very similar to the Delesseria on which it 

 lived. Too much stress should not be laid on this point, however, 

 since Mr. Hunt's example, although apparently found on the same 

 weed, || was olive in colour. The mid-dorsal and lateral lines of the 

 upper surface darker. The epidermis of the upper surface is of a 

 bluish-green hue, as Gosse has already noticed (loc. cit. p. 317). On 

 the sheaths of the rhinophores are scattered bluish-white spots ; 

 semilunar markings of the same kind occurred at the base of the 



* "Complete List of Opisthobranchs at Plymouth," Journ. Mar. Biol. Assoc. 

 (n. s.) i. No. 4, p. 430. 



t " The Occurrence of Hancockia at Plymouth," ibid. (n. s.) vol. ii., No. 2, 

 p. 193. 

 X Ann. and Mag. Nat. Hist., ser. 4, vol. xx., 1877, p. 316. 

 § Mem. della R. Ace. delle Sc. dell' Instituto di Bologna, ser. 5, vol. vii. 

 || G-osse, loc. cit. p, 316, note. 



