770 SIR CHARLES ELIOT ON A RARE XUDIBRAXCH. 



with tlie oral sucker and measuring -024 x "020 mm. This is 

 followed by an oesophagus about twice as long as the pharynx. 

 The intestinal bifurcation takes place rather nearer the ventral 

 sucker than the oral sucker, and the simple diverticula extend 

 a little beyond the posterior border of the fixing disc. The 

 excretory vesicle consists of a wedge-shaped sac, which extends 

 forward as far as the ends of the intestinal diverticula. 



This is in all probability the larval stage of some species of 

 Hemistomum, parasitic in a bird. 



•14. A Note on tlie rare Britisli Nudibrancli Hancocha 

 eudactylota Gosse. By Sir Charles Eliot, Iv.O.M.G., 

 C.B., F.Z.S. 



[Received April 18, 1912 : Read May 21, 1912.J 

 (Plate LXXXV.) 



See Gosse, On Hancoclia eudactylota, Ann. Mag. Xat. Hist. ser. 

 4, XX. 1877, pp. 316-318 ; Gamble, On two rare British Nudi- 

 branchs, Lomanotus genei and Hancockia eudactylota, ib. ser. 6, ix. 

 1892, pp. 378-385; Trinchese, Ricerche anatom. sul genere 

 Oovia ( = Hancockia), Mem. della E. Accad. delle Sci. dell' 

 Istituto di Bologna, ser. 5, vii. pp. 183-191, 1886; Eliot, Sup- 

 plement to Alder and Hancock's Monograph of the British 

 Nudibranchiate Mollusca, Ray Society, 1910, pp. 17, 72, 

 118-120, 163. 



No coloured figure of this rare British ISTudibranch has yet 

 been published so far as I am aware. I endeavoured to include 

 one in my Supplement to Alder &, Hancock's Monograph, but 

 no specimen of the animal could be obtained before the time fixed 

 for publication. Shortly afterwards a single individual was 

 captured at Plymouth and drawn by a local artist under tlie 

 supervision of the natui'alists w4io were working in the Laboratory 

 of the Marine Biological Association. I have not seen the animal 

 alive, but these drawings agree with what is known of its struc- 

 tui-e, and I have no doubt that they faithfully reproduce its 

 appeai'ance. 



For an account of the genus and species see the references to 

 my Supplement given above. 



EXPLANATION OF PLATE LXXXV. 



JSancocTcia etidactt/lota. 



Fig. 1. Dorsal view of animal. 



2. Veutral view of animal. 



3. Side view of liead. 



4. A rliinopliore. 

 5.) 



6. > Difterent views of lateral processes. 

 7.) 



