388 SIR c. ELIOT OX NUDiBRANCHS [Mar. 1, 



developed in any specimen, but in some there were bulges which 

 may represent these organs in a state of contraction. The labial 

 armature is a strong, I'ough yellowish ring ; it consists of fairly 

 long rods, hooked at the end. The radula is deep red ; the 

 formula is about 55 x 50.0.50. The innermost teeth have a 

 moderately broad central cusp, with two or three denticles on the 

 side nearest the rhachis and five or six on the outer side. The 

 next two or three teeth are much like them, but are denticulate 

 only on the outer side. The other teeth are long and hamate, 

 with from six to ten minute but distinct denticulations on the 

 outer side only. The outermost teeth retain their form fairly 

 well, though they are smaller than the others. 



This beautiful species is dedicated to my friend Mr. E. E.. 

 Sykes as some slight acknowledgment for the invaluable 

 assistance he has rendered me in seeing my papers on the Nudi- 

 branchiata through the press. 



3. Chromodoris CAVJ3. (Plate XXIII. figs. 7 & 8.) 



Chromodoris cavm Eliot, Abstr. P. Z. S. 1904, No. 4, p. 15, 

 March 8. 



Several specimens from the East and West Coasts of Zanzibar. 

 The following are the notes on the living animal : — " Colour 

 yellowish white, with indefinite large drab blotches laterally. 

 Edges of mantle and foot bordered with light violet. On the 

 back are black spots surrounded by a white line and also irregular 

 dull orange spots. The foot is not very broad, white in colour, 

 with a row of dull orange spots and black spots below them. 

 The tip and anterior side of the rhinophores are purple ; the 

 lamellfe are I'educed to fine striations. The margins of the rhino- 

 phorial and branchial pockets are not at all raised ; the rhino- 

 phores and gills when reti'acted are not completely out of sight. 

 The mantle is ample. The skin is quite smooth and even. In 

 captivity the animals sometimes swim on the sui-face of the water, 

 foot uppermost." 



The measurements of the largest alcoholic S23ecimen are : — 

 Length 60 mm., breadth 34 mm., height 14 mm., free edge of 

 mantle 10 mm. over the head, 9 mm. at sides of body. The 

 branchife (PI. XXIII. figs. 7 & 8) vary from 12 to 16. Ten are 

 fairly large and form a circle open behind. On the inside of this 

 circle are set on either hand fi'om one to three smaller plumes. The 

 foot is grooved in front and the upper lamina is attached to the 

 side of the head. The mouth is a very distinct vertical slit, and 

 at its lower corners, just about the point where the lamina of the foot 

 terminates, are a pair of fairly well-developed tentacles. The labial 

 armature is a not very compact mass of long bent rods, not bifid 

 at the end. The rhachis of the radula bears transparent lozenge- 

 like thickenings, which are, however, not very distinct. There 

 are about 60 rows containing about 70 teeth on each side of the 

 rhachis. The innermost are much as in Chromodoris sykesi, but 

 the central cusp is broader and there are about 5 denticles on the 



