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Show 388 SIR C. ELIOT ox NUDIBRANCIIS [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, rough 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 m y friend Mr. E. R. Sykes as some slight acknowledgment for the invaluable assistance he has rendered me in seeing m y papers on the Nudi-branchiata through the press. 3. CHROMODORIS CAV.E. (Plate XXIII. figs. 7 & 8.) Chromodoris cctvce 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 lamellae are reduced to fine striations. The margins of the rhino-phorial and branchial pockets are not at all raised; the rhinophores and gills when retracted 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 surface of the water, foot uppermost." The measurements of the largest alcoholic specimen 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 branchiae (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 from 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 lozengelike 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 |