1904. J FROM EAST AFRICA AND ZANZIBAR. 277 



aud ai^e hard and stift\ The largest is 26 mm. long and 12 high, 

 7 .broad as measured across the rhinophores, and 15 across the 

 branchiae. The integuments ai-e thick and tough, the intestines 

 bright yellow, and as usual in the genus. The branchiae 8 ; the 

 anal papilla not in the centre but somewhat to the right. 



These specimens do not look like D. nigra as preserved, and 

 apparently did not look like it when alive, since they were kept 

 separate from normal examples of the species, but it is difficult to 

 formulate any distinguishing characteristics except the stiffness 

 and thickness of the integuments. 



DoRiDOPSis DENisoNi (Angas). 



D. gemmacea A. & H. 



[Angas, Descr. d'esp^ces nouvelles de MoU. Nudibr., Journal 

 de Conchyl. ser. 3, iv. i. 1864, p. 45 ; A. & H., Coll. of Nud. MoD. 

 made in India, p. 126; Bergh, S. R. xv. p. 694 ff.] 



One small specimen from near Wasin, East Africa. 



The living animal was long, narrow, and high ; the mantle- 

 edge, though not wide, descended straight down to the gi'ound on 

 each side, so that the sides of the foot were hidden by it. The 

 centi'al part of the back was flat and smooth, but bounded on 

 each side by three large tubercles. Two more stand in the median 

 dorsal line immediately before and behind the rhinophores. A 

 few more tubercles are scattered here and there near the sides. 

 In the centre of the back were two large eye-Hke spots (similar to 

 those found in some species of Xotarchus), blight blue with rims 

 of dull dark yellow, and on each side were five double spots (each 

 like the figure 8) of similar colour. The tubercles were tipped 

 with brown, undei'neath which was a band of yellowish white. The 

 ground-colour of the back and of the bases of the tubercles was 

 reddish bro"\vn with clear lines of yellowish white. On the mantle 

 was a border formed by alternate blotches of pale yellow and 

 light crimson. The under surface was of a beautiful pink, deeper 

 towards the mantle- edge, but without markings. The edge of the 

 gill-pocket was slightly toothed. The gills 5, tripinnate, but not 

 ample, white, with dark brown lines on the rhachis. The animal 

 was flexible and lively in its movements ; the tops of the tubercles 

 were often drawn in and then thrust out again. Tlie beating of 

 the heart was distinctly visible under the skin. 



The preserved specimen is 7 mm. long, 3 broad, and 2*5 high. 

 The mantle-edge is narrow. The lumps on the back remain fairly 

 distinct. The rhinophores are large, the tentacles small. The 

 five gills are erect and strong, but not very ample. The internal 

 organs are yellowish, and seemed to be as usual in the genus. 

 Pei-icardial lamellie were not discovered, but this was probably 

 due to the small size of the specimen. 



Angas's D. denisoni is identified with A. <t H.'s D. gemmacea 

 by Bergh, in spite of considerable differences of colour, and 

 J), gemmacea is said to vaiy a little in colovir and markings. The 

 present specimen is clearly allied to these forms, and as, in view 



