134 MESSRS. ALDER AND HANCOCK ON 
Dorsal tentacles set wide apart, stout, clavate, freckled with brown; produced above 
into a white mucro; sheaths short, with the margins minutely papillated. Oral ten- 
tacles forming broad lamelliform lobes. Branchial plumes five, tripinnate, large and 
spreading, situated on an elevated portion of the centre of the back, and rising from a 
slightly pedunculated base ; they are freckled like the body, with a pale line running up 
the stem and branches. The dorsal ridge of the tail is produced into a large fin-like 
expansion, the margin of which bears a few minute processes. Foot rather narrow, pale 
yellowish white, pointed behind, and truncated in front, where there is a shallow groove 
forming an indistinct frontal lamina: the upper surface is spotted with yellow or orange. 
Length 12 inch. 
A variety is of a deep orange-colour, darkest on the centre of the back, and without 
markings: the branchiz and other processes are pale and nearly white: the upper 
surface of the foot is also paler and spotted with orange. 
Polycera (?) ceylonica, Kel. in Journ. Asiatic Soc. (Ceylon Branch) 1858. 
This interesting mollusk is rather common on the Coromandel coast. According to 
Dr. Kelaart, it is very rare in Ceylon. He remarks that ‘‘ The transparent membranous 
expansion is fully extended when the animal swims, which it does more freely than any 
known species. For ten or fifteen minutes it will keep floating and moving its body 
like an eel in the water.” 
There are five or six specimens preserved in the collection. 
Genus Katineéa!, nov. gen. 
Body oval, subprismatic, rounded behind. Cloak not much produced, the margin 
most developed in front, where there is a row of close-set papillated processes covering 
the head ; a few similar processes are on the sides of the back. Dorsal tentacles lami- 
nated, retractile within sheaths. Oral tentacles flattened. Branchiz plumose, non- 
retractile, surrounding the vent, but placed separately at a little distance from it on the 
posterior part of the back. ‘Tongue broad, with numerous rather distant rows of tri- 
cuspid spines: no jaws nor collar. 
This genus is somewhat intermediate between Euplocamus and Plocamophorus, but 
differs from both in the obtusely rounded form of the body, and in the separate position 
of the branchial plumes, in this respect approaching to Heaabranchus. It also differs 
from Plocamophorus in the absence of an expanded veil, as well as of the peculiar fin- 
like tail. The oral armature is likewise different from that of the two former. 
Of the three specimens in the collection, two were much mutilated, and the third was 
quite in an immature state. The anatomy of all the organs, therefore, could not be 
determined. 
The buccal organ is extremely large and muscular : it is of a rounded form, somewhat 
' An old Indian name for Telinguna. 
