1904.] FROM EAST AFRJCA AND ZANZIBAR. 395 



discernible. All the teeth whicli I examined were hamate, with 

 bifid tips, exactly like those of Clir. semperi as figured by Bergh. 



Another specimen captin-ed at Chuaka, on the East Coast of 

 Zanzibar, seems to belong to the same species, though at first sight 

 is strikingly difierent from the individual described above, being 

 larger, stouter, and of another colour. The notes on the living- 

 animal describe it as lemon-yellow, with very deep purple-black 

 .stripes ; the gills and rhinophores verniilion ; the foot purplish 

 underneath and at the edges. 



The preserved specimen is pale j'ellow, with black lines ari-anged 

 much as already described, including a horseshoe round the 

 branchiae, but shorter and more numerous. It is 30 mm. long, 

 15 high, and 13 broad. The mantle-edge is a narrow thick ridge, 

 measuring 1"5 mm. at the sides, 2'5 over the head, and 3 over the 

 tail, which is 10 mm. long. Tlie liody is high and tliick, but the 

 sole of the foot nairow (maximum 3 mm.). The pockets of the 

 i-hino{)hoi-es and bi'anchiie are small and veiy slightly i-aised. 

 The branchiae are ten, set in a complete circle, but the anterior 

 plumes are larger than the posterior. One of the latter is veiy 

 small and perhaps merely an oft'shoot. The foot is rounded in 

 front, grooved but not notched. The tentacles are retracted and 

 hardly visible. 



The labial armature is yellowish and formed of shoi't thick hooks. 

 The formula of the lai-ge and closely-l^icked but very fragile radula 

 is about 90 X 75.0.75. The teeth are mostly bifid at the tip and 

 otherwise smooth. Only the innermost have an accessory denticle 

 on the inner side, and ai-e thus trifid. The outermost are serrulate 

 at the apex. 



These two specimens seem to be merely colour-varieties of a 

 single species Avhich is closely related to Clir. semperi B. Except 

 that the external teeth of the i-adula bear moi'e numerous and 

 more distinct serrulations, the principal characters appear to be 

 identical. But whereas Chr. sovperi is spotted, the animals here 

 examined are marked with exceptionally clear and nai-row black 

 lines, which seem engraved on the surface. They must therefore 

 be accorded specific rank, at least provisionally. It is possible 

 that intermediate forms may be discovered, as the variety first 

 described bears some yellow blotches. 



11. Chromodoris scurra B. 



Chromodoris scurra Eliot, Proc. Acad. Nat. Sci. Philadelphia, 

 Dec. 1899, p. 518. 



[Bergh, 8. R. xi. p. 478, and Joiu'nal de Mus. Godefiroy, Heft vi, 

 1874.] 



Two specimens from Zanzibar Harbour. 



The coloiu'S of the living animal are brilliant. 1 )own the centre 

 of the back runs a white line, and on each side of it are borders 

 in the following order : (1) nari'ow deep red line, (2) broad orange- 

 yellow band, (3) narrow deep I'ed line, (4) violet band, which 

 broadens out anterioilv and posteriorlv, (5) white boi'der running 



