394 SIR C. ELIOT ON NUDIBKANCHS [Mar. 1, 



The alcoholic specimen is high and stoutly built ; length 14 mm., 

 bieadth 5, height 6. The mantle is moderately ample; under its 

 posterior margin it beais eight conical piotubei-ances, four of which 

 are very distinct and the rest smaller. There are none, however, 

 on the anterior j^oition of the mantle as in the specimens described 

 by Bergh. The branchise ai'e 12 and exposed in the presei'ved 

 specimen. The foot is rounded in fi'ont and sti-ongly grooved. 

 The labial aiinature and radula ai-e much as desciibed and figured 

 by Bergh. The formula of the latter is about 50 x 70.0.70. The 

 teeth aie bifid ; the innei-most bear an accessory denticle on the 

 inner side and hence appear trifid. The others bear two or three 

 very fine denticulations below the two prongs. The outermost 

 have 5-7 rather lai'ger denticles. 



A second specimen subsequently examined has also only a few 

 conical pi-otuberances behind and none in fi-ont, so that this 

 peculiarity is perhaps characteristic of East Afi'ican specimens. 



10. Chromodoris xigrostriata. (Plate XXIV. figs. 5 &, 6.) 



Ch-omodoris nigroslriata Eliot, Absti-. P. Z. S, 1904, No. 4, 

 p. 15, March 8. 



One specimen fi-om the mouth of Chuaka Bay, found among 

 the branches of gi-owing coral at exti'eme low tide. 



The living animal was 15 nun. long and 3 broad when fully 

 extended. The foot was broad and high ; the mantle-edge was 

 nariow, and in the alcoholic specimen has become a mere low 

 ridge. The gi'ound-colour was a violet-blue grey, with lather ill- 

 defined blotches of light primrose-yellow on thy back, mantle-edge, 

 and sides of the foot. On the back and sides of the foot were also 

 very distinct cui-^ed black lines, one of which foiiiied a horseshoe 

 round the gill-pocket, while the rest were arranged in a neai'ly 

 symmetrical figure. The edges of the rhinophoi'e and gill-pockets 

 wei'e not i-aised. The gills wei'e seven and completely i-etractile 

 into a pocket which could close over them. The separate plumes 

 were oiange-red, but the lather lai'ge basal jjart, wheie they 

 were all united, was of the same violet-grey as the body. The 

 ihinophoies wei'e of a rathei' deep red. 



The alcoholic specimen is of a uniform bluish grey ; the yellow 

 blotches have disappeared, but the black lines are veiy distinct 

 and vivid. The ihinophores aie large, and of the se\en gills 

 thi'ee appear to be much laiger than the othei'S, which is not 

 apparent fiom the drawings oi' desciijitions of the living animal. 

 The tentacles ai'C entii-ely withdrawn and only indicated by two 

 }aickers, one on each side of the mouth. The front of the foot is 

 lound, and no groove is visible. The anteiior part of the body 

 has been toin, with the lesult that the buccal paits have been 

 injured. The labial armature is a mass of thick stout hooks, 

 shaped much as in Bergh 's figure of Chr. semperi, airanged in a 

 i-egular tessellated pattern. Tlie ladula, which seems small and 

 brittle, is much damaged. >To rhachis or rhachidian teeth are 

 [16J 



