86 SIR c. ELIOT ON NUDiBRANCHS [May 1 7, 



of Trevelya7ia yet found in East Africa, 3 inches long, and stout 

 in proportion. The colour was bright vermilion, plentifully be- 

 sprinkled with slightly projecting spots of a deeper shade. The 

 I'hinophores and gills were small and deep vermilion in colour. 



The preserved specimen has greatly shrunk, and is 25 millimetres 

 long, 14 high, and 11 broad. The colour is dirty white, and no 

 spots or tubercles are visible. There is no trace of tentacles or of 

 a mantle-edge, but the frontal veil is a distinct hard ridge. The 

 foot is grooved in front. The tail is very short. There are 

 12 small gills set in a circle, bipinnate and in parts tripinnate. 

 The vent is subcentral and not raised. 



Though there is nothing that can be called a labial armature, 

 the labial cuticle is strengthened with scattered rods of various 

 shapes. The radula is larger than usual in the genus. It con- 

 sists of 36 rows, some of which contain as many as 51 teeth, 

 so that the formula is 36 x 50 -f 1.0.1-1-50, but the rows towards 

 the front are much smaller. The first lateral is large and hamate 

 (fig. 2 a), sometimes with irregular notches or denticles on the out- 

 side of the hook (figs. 2 c & 2 d). In several ca.ses the top seemed 

 to be broken otf, and the remaining part was bifid or trifid 

 (fig. 2 h). The other teeth are slender and hamate (figs. 2 e & 2/). 

 In all the teeth the hook is directed forwards, not backwards. 



The liver is greyish and not very large. In front of the liver, 

 but quite separate from it and from one another, lie two large 

 spherical hermaphrodite glands with a diameter of about 5 and 

 7 millimetres respectively. They are yellowish in colour, and 

 the surface is covered with knob-like follicles. The verge is armed 

 with transparent spines. The large pericardium lies in front of 

 the branchiaj, and in the alcoholic specimen is much inflated. 



This form is possibly the Steiiodoris rubra of Pease (Am. 

 Journal of Conch, ii. 1866, p. 206), though, if so, "light red 

 papillse " is a strange description of the raised spots ; but the 

 account given of the animal is not suflicient to admit of 

 identification. 



Trevelyana ceylonica Kel. (Plate III. figs. 3a-3c.) 



[Kelaart, Ann. & Mag. of Nat. Hist. 3rd ser. vol. i. p. 257, 

 1858.] 



One specimen from the East Coast of Zanzibar. 



The notes on the living animal describe it as about an inch long, 

 creamy white, with bright red dots. The gills were yellow, with 

 bright red lines down their backs ; lai-ger and more feathery than 

 is usual in the genus. There was a line of bright red round the 

 edge of the foot. 



The preserved specimen is colourless, 15 millimetres long and 

 6"5 broad. The back is quite smooth, and there is no sign of a 

 mantle-rim. The pericardium forms a large, much swollen 

 prominence. The rhinophores are completely retracted. There 

 are 12 branchiae set in a circle open behind; one is large and 

 bifid, one is rudimentary. The foot is deeply grooved in front. 

 No tentacles could be discerned. 

 [4] 



