G 1 G ELYSIADiE. 



CENIA, Alder and Hancock. 



" Animal limaciform ; the back elevated ; head slightly 

 angulated and bearing two linear tentacles on the dorsal 

 aspect, behind and exterior to which are the eyes. Vent 

 a little behind the centre of the back." 



C. CocKsii, Alder and Hancock. 



Plate C. C. C, fig. 6. 

 Ann. Nat. Hist. 2nd series, vol. i. p. 404, pi. 19, fig. I. 



Body black above, fading into fawn-colour at the sides. 

 Head with a black central strij)e, fawn-coloured (as well as 

 the tentacles and the spaces around the eyes) at the sides. 

 A slight ridge, with three or four pale tubercular spots on 

 each side of the back in the region of the vent. Tentacles 

 cylindrical, obtuse. Length, three-sixteenths of an inch. 



Discovered by Mr. Cocks on sea- weeds, in pools, between 

 tide-marks, at Falmouth. 



END OF THE THIKD VOLUME. 



LONDON : 



Printed by Samuel Bbntlev, and Co., 



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