1904.J FROM EAST AFRICA AND ZANZIBAR. 387 



next to the i-liacliis bear 3-4 small denticles on each side, and 

 those nearest to them are somewhat similar but denticulate only 

 on the outer side ; the others are long and hamate, with about 

 8 denticles on the outer side (PI. XXIII. fig. 4, a, b, c). The 

 outermost bear 3-4 denticles on the apex. A drawing of the 

 alimentary canal is annexed (PL XXIII. fig. 5). 



I think these animals can be referred to Chr. reticulata Pease, 

 with which Collingwood's Ch7\ alderi seems to be identical. All 

 my specimens are flat, with a,mple mantle- margins, and this 

 agrees with Collingwood's description and plate. Bergh, on the 

 contrary, says : '' Die Korperform ist langlich nicht sehr nieder- 

 gedruckt . . . der Mantelsaum ziemlich schmal." But these soft 

 Chromodorids have great powers of changing their shape and 

 proportions. The branchise are much moi-e numei'ous than in the 

 specimens previously described, but a multiplication of the small 

 plumes in the spiral does not appear to constitute a specific 

 diiference. 



2. Chromodoris sykbsi. (Plate XXIII. fig. 6.) 



Ghromodoris sykesi Eliot, Abstr. P. Z. S. 1904, No. 4, p. 15, 

 March 8. 



Numerous specimens from the East Coast of Zanzibar, obtained 

 both on the shore and by dredging. A few of the animals were 

 of a reddish brown with dirty yellow markings, but in the 

 majority the coloration was most gorgeous (PI. XXIII. fig. 6). 

 The dorsal sui'face was bright orange, passing into light yellow 

 towards the edge of the mantle, round which was a double border 

 of reddish brown internally and bright violet externally. On tlie 

 back were numei-ous rings of opaque white, but otherwise the 

 whole body was translucent. The foot and underside of mantle 

 were of a rich light yellow. The rhinophores and branchiae were 

 both of a deep brown-red with opaque white spots. The per- 

 foliations of the rhinophores were indistinct, and the pinnse of 

 the branchiae small though made conspicuous by white lines 

 drawn along them. The animal was rather flat and very soft. 

 The mantle was veiy ample. 



Tlie largest alcoholic specimen is 40 mm. long, 27 broad, and 

 10 high. The free edge of the mantle measures 7 mm. over the 

 head, 10 at the sides of the bod}^, and 13 over the tail. In giving 

 the measurements, the breadth of the body is estimated as the 

 mantle falls in its normal position : the edge of the mantle is 

 taken as extended, but not stretched unnaturally. The openings 

 of the rhinophores and branchiae are small and only slightly raised, 

 but the interior of the branchial pocket is a capacious and very 

 strong bag. The branchiae are arranged as in Ch7\ reticulata and 

 vary from 12 to 18, according to the size of the spiral. They are 

 red and striped with white. The anal papilla is tall, red and 

 spotted with white. The foot is rounded and grooved in front. 

 Two rather strong folds connect the upper lamina with the 

 corners of the mouth. The oral tentacles were not distinctly 



Proc. Zool. 8oc.— 1904, Vol. I. No. XXVI. 26 



