two rare Britiah Nudihr<inclis. 379 



the same part of riynioutli Souiul. Finding that my Loma- 

 notus possessed certain peculiarities of which I cnidd find no 

 adequate deseri[)tion or iigures, and that ILincockia had only- 

 been taken on one p,revious occasion on the British coasts (by 

 Mr. A. R. Hunt in Tor Bay, 1877), I observed and drew 

 the living animals with the following results. 



Lomanotiis (jeneij Verany. (PI. XVII. figs. 1 and 2) 



Specimens referable to this species have been taken from 

 time to time on our coasts. Mr. Garstang, in his recent 

 report *, has collected these cases and added a number which 

 have occurred at Plymouth. The following description of 

 my own specimen agrees closely in certain points, such as 

 size, colour, and general structure, with that of his two dark 

 individuals t- 



Length lialf an incli. 



Colour dark brown, with irregular yellowish spots ; the 

 papilhe each with a dark band below a white tip. The general 

 tint agreed closely witli that of the Fucus on which I found it 

 after being dredged, and u))on which it lived in captivity. 



Oral veil with two prominent processes on each side, the 

 outer ones being the larger, llhinophores retractile within 

 calyx-like sheaths, clavate, laminated at the base, with smooth 

 truncate tips. Sheath-margins each produced into five 

 papillte of very definite shape when expanded. These 

 papilla?, like those of tlie oral veil and pleuropodium, are 

 capable of contraction and dilatation. Pleuropodium con- 

 sisting of four Avell-mavked lobes on each side. The centre 

 of each lobe is dorsal and close to the middle line. It is 

 marked by the large dorsal papilla. The sides of the lobe 

 extend anteriorly and posteriorly in a ventral direction, 

 enclosing a slightly concave area, and bearing papillae. 

 Posteriorly the lobes become slightly irregular and meet on 

 the dorsal surface. Foot slender, produced anteriorly into 

 recurved processes. Genital aperture beneath and slightly in 

 front of the first large dorsal papilla of the right side. Anus 

 beneath the second. 



My attention was first drawn to the characteristic form and 

 changes of shape assumed by the dorsal papillae. These 

 changes consisted of contraction from an extended definite 

 shape to a more or less bulbous triangular one. So far as I 



* " Complete List of Plymouth Opistliobranclis," Jo am. Mar. Biol, 

 Assoc, (n. s.) i. no. 4. 



t " Report on Nudibranchs of Plymouth Sound," Joui-n. Mar. Biol. 

 Assoc. I. ii. ]88y, p. 187. 



