1903.] FROM EAST AFRICA ANB ZANZIBAR. 363 



whereas in A. africana it is violet, both externally and in the 

 intestines ; (2) the tentacles are small ; (3) there are no tubercles 

 on the underside of the mantle-edge ; (4) the rhinophores and 

 their pockets are somewhat different from those of -^4. africana ; 

 (5) so are the teeth. 



It is possible that this is the Doris rusticana of Alder & 

 Hancock (" Notes on a Collection of Nudibranchiate Mollusca 

 made in India," Tr. Z. S. iii. p. 120), but in view of their statement 

 " No oral tentacles (?) ; the head with lateral angles ; branchial 

 plumes five," identification is nob possible. 



3. Staurodoris depressa, sp. n. 



One specimen from Wasin. No notes as to living animal. ' 

 The alcoholic specimen is 6*3 centimetres long and 4*9 broad. 

 The general shape is broad and flat. The thick and fleshy 

 mantle-brim is 2 centimetres wide, and the foot conseqviently 

 unusually small compared with the dorsal surface, being only 

 2"7 mm. long and about 8 mm. broad. The colour is a uniform 

 greyish white, with a slight tinge of violet anteriorly and down 

 the middle of the back. The whole upper surface is covered with 

 warts, which 'are small at the mantle-edge but increase in size 

 towards the centre. The top of the larger ones, which measure 

 5 millimetres across, is flat and hard, consisting of a mass of 

 densely- crowded spicules, and is of a somewhat different shade 

 from the rest and in life possibly distinctly coloured. On the 

 underside of the mantle- edge are numerous small tubercles of 

 glandular appearance. The openings of the rhinophores and 

 branchiee are tuberculate. The latter orifice is indistinctly stellate 

 and also indistinctly bilabiate, but it is not clear v/hat its original 

 shape may have been. Both the branchial and i-hinophorial 

 orifices are closed in the alcoholic specimen. The branchiae are 

 six in number, but the hindermost pair are deeply bifid so that 

 theie appear to be eight. They are mostly bipinnate and rather 

 scanty. The foot is grooved and notched in front. The tentacles 

 are large, distinct, and somewhat flattened, with rather uncertain 

 traces of a groove. Tliere is no labial armature. The ludula is 

 broad and white, the formula being about 70.0.70x32. The 

 teeth are simply hamate and all of much the same size. On some 

 of the inner ones I was able to see eight or ten very minute 

 denticles on the inside of the hook. This extremely fine seirula- 

 tion is difficult to detect, but I expect that it is present on all the 

 teeth except the oiitermost. The stomach is not free, but is 

 enclosed in the liver. The female reproductive organs are armed 

 with small transparent brick-like scales. 



This form offers analogies to both Homoiodoris and ArtacJicea 

 Bergh, particularly the latter, and the thick leathery mantle and 

 large warts also remind one of Aster onot as. On the whole I class 

 it, though very doubtfully, as Staurodoris, mainly because the 

 openings of the I'hinophores and biunchite are closed by the 

 surrounding tubei'cles. 



