two rare British Nudibranchs. 379 
the same part of Plymouth Sound, Finding that my Zoma- 
notus possessed certain peculiarities of which I could find no 
adequate description or figures, and that Hancockia had only 
been taken on one previous 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. 
Lomanotus genet, 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 f. 
Length half an inch. 
Colour dark brown, with irregular yellowish spots; the 
papilla each with a dark band below a white tip. The general 
tint agreed closely with that of the /wews on which I found it - 
after being dredged, and upon which it lived in captivity. 
Oral veil with two prominent processes on each side, the 
outer ones being the larger. WRhinophores retractile within 
calyx-like sheaths, clavate, laminated at the base, with smooth 
truncate tips. Sheath-margins each produced into five 
papile of very definite shape when expanded. These 
papille, like those of the oral veil and pleuropodium, are 
capable of contraction and dilatation. Pleuropodium con- 
sisting of four well-marked 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 papille. 
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 papille. 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 Opisthobranchs,” Journ, Mar. Biol. 
Assoc, (n. s.) 1. no, 4. ; 
+ “Report on Nudibranchs of Plymouth Sound,’ Journ. Mar. Biol. 
Assoc. I, 11. 1889, p. 187. 
