1904.] FROM EAST AFRICA ASU ZANZIBAR. 27'3- 



fication. It Ls noticeable tluit none of the species liere mentioned 

 are new, although in other genera novelties have been aljundant 

 on these coa.sts. 



DORIDOPSIS TUBERCULOSA. 



[Bergh. Jour. Mus. Godefll'ov. Heft :dv. 1878. pp. 38-40, and 

 n 8. K' xvi. 2, pp. 845-848.] 



Several specimens from the Ea.st and West Coasts of Zanzibar^ 



The following are the notes on one of the li%'ing animals : — " Gill- 

 pocket shaped like that of Asteronotas, 5-lipped. GilLs five, quadi-i- 

 pinnate, large, and brown. Rhinophores bent backwards, pockets 

 raised at edges. Body soft but firm; grey with black patches ; back 

 covered with large compound tubercles. Under side of mantle 

 and sides of foot a dii-ty brown with white blotches : foot lighter 

 and without blotches. Free mantle-margin about 20 mm. A mast 

 handsome creature." 



The dimensions of tlie largest alcohoHc .specimeiLS are, length 

 97"0, breadth 60"O, height 36 mm. The free mantle-edge is 

 ample and the foot of moderate size (58 mm. long by 25 broad)^ 

 The colour is much as described in the living animals, but in two 

 of the specimens the tubei-cles ai'e plentifully besprinkled with 

 black dots. The whole back is covered with compound tubercles, 

 which are smaller towards the mantle-edge. The rims of the 

 rhinophore-pockets are prominent but not conspicuous ; the club 

 of the rhinophores is set at almost right -angles to the thick stalk 

 and bears 50-60 deep per foliations. The biancliial aperture is 

 i-aLsed and .stellate ; it Ciin be almost closed by five triangular 

 lobes which bear tubercles on the outside. The five branchiae are 

 quadripiunate with remarkaljly stout stems. In one .specimen 

 there are six lobes and .six branchiae. The anterior part of the 

 foot i.s much retracted and distorted in all the specimens, but it 

 appears to be thickened and notched but not gi-ooved. 



The buccal cone is 5'5 mm. long in the largest specimen. From 

 it issues a long narrow tulje (36 mm. by 2 mm.), bent almost into 

 the shape S on the left side, with a smooth interior, which then 

 dilates more or less clearly in different specimens into a .sausage- 

 like shape, 25 mm. long by 10 broad. The walls of this dilatation 

 •are strong and laminated internally. After it the digestive tract 

 narrows again, and a tube 9 mm. long and 5 broad leads into the 

 hollow of the Hver. This organ is very large (51 mm. long by 38 

 broad), yellow, and distinctly bilobed behind. The mouth-gland 

 is large, yellow, and with several lobes. The salivan^ gland.s are 

 small, oval, and set at the top of the .sausage-.shaped dilatation. 

 The single blood-gland is elongate and purple. The central 

 nervous .sy.stem is as usual in the genus. The pericardial lamina; 

 are distinct and yellowish. The albumen and mucous glands are 

 very large : the vas deferens is thin, extremely long, and much 

 convoluted. The verge is armed with numerous colourless spines, 

 not much lient. rather irregular in shape and rising out of circular 

 discs. • ■ ' 



Proc. Zool. Soc— 1904. Vol. XL Xo. XVIII. 18 



