74 POLYCERID^E. 



on the sides of the back : dorsal tentacles laminated, retractile 

 within sheaths : oral tentacles tubercular : gills plumose, non- 

 retractile; odontopJiore broad, with lateral spines of three 

 kinds ; the first next the centre large and bicuspid, the next 

 five or six short and squarish, the remainder very long, curved, 

 and slender. 



This genus agrees with the Plocamophorus of Ruppell in 

 having a branched veil in front, but differs in the absence of 

 the fin-like tail. It has also a considerable resemblance to 

 Thecacera, in which genus, however, the veil is either absent 

 or imperfectly developed. The tongue differs from that of any 

 other genus of the family. 



CRIMORA PAPILLA'TA, Alder and Hancock. 



C. papittata, A. & H. in Ann. N. H, 3rd ser. x. p. 263. 



BODY ovate-oblong, tapering posteriorly, white, with the 

 processes tipped with yellow : dorsal tentacles subclavate, 

 yellow, retractile within short sheaths : oral tentacles short, 

 tubercular: head-veil bilobed, each lobe furnished with five 

 more or less branched appendages : a slight pallial ridge, 

 bearing numerous yellow filamentous papillae, runs down each 

 side of the back, terminating in a small bifid process behind ; 

 similar small papillae are dispersed over the body : gills 3, tri- 

 pinnate. L. 0-6. 



HABITAT : A single specimen of this interesting Nudibranch 

 was dredged by the Eev. A. M. Gorman among Zosterce in 

 shallow water, in Moulin Huet Bay, Guernsey, in 1858 ; and 

 another specimen was obtained by the same gentleman on again 

 visiting the island in 1865. 



** Dorsal tentacles without sheaths, non- retractile. 



Genus V. POLY'CEKA*, Cuvier. 



BODY limaciform, smooth or tuberculated : mantle indistinct, 

 forming a digitated veil in front, and a tubercnlated ridge on 



* Many-horned. 



