1903.J FROM EAST AFRICA AND ZANZIBAR, 365 



were raised and crenulate, the rhinophores bent backwards. The 

 branchial opening is a transvei-se slit, the two lips almost meet in 

 the middle but separate at the sides. The branchiaa are six, 

 tripinnate, the posterior pair bifid. The labial cuticle bears two 

 small yellowish plates composed of minute rods. The radula 

 formula is about 23 X 40.0.40. The teeth ai-e simply hamate ; the 

 two or three outermost are rudimentary, the innermost are 

 smaller and liave rather shorter hooks as described by Bergh. 



6. DiSCODORIS C^RULESCENS VARIEGATA, Subsp. n. 



[Bergh, in Semper's Reisen, xvi. Halft i. p. 805.] 



One specimen from Jembiani, Zanzibar. 



The living animal was about an inch long and of a light slaty 

 blue, with many small blackish blotches. The coloration of the 

 underside was similar but rather lighter. 



In alcohol the blue parts have become yellow, a remarkable 

 change of tint which has also occurred in Trippa monsoni. The 

 texture is leathery and stiff but not hard. The whole dorsal 

 surface, including the rims of the rhinophore and gill-pockets 

 which are raised, is covered with minute tubercles. The branchial 

 pocket is roundish, with a jagged edge and very deep. Within it 

 are six tripinnate branchia?. The foot is grooved and the upper 

 lip deeply cleft. Immediately above this cleft is the mouth, with 

 a white, tapering, digitate tentacle on each side. In the upper 

 part of the oral tube are two I'oughly triangular collections of 

 minute rods, less definite in outline and consistency than the type 

 of armature generally described as labial plates, but sufliciently 

 large to warrant us in describing the cuticle as armed. The 

 radula consists of 30 rows, containing about 45 white, simply 

 hamate teeth on each side of the rhachis. The innermost and 

 outermost are somewhat smaller, but not degraded in shape. The 

 reproductive system is not armed. The pi'ostate is bent and 

 fairly large, but I was not able to discover the peculiar structure 

 of the hermaphrodite gland mentioned by Bergh. 



This animal appears to have all the chief characteristics of Bergh's 

 D. cceridescens, and comes from much the same part of the world. 

 Mbbius's specimen (from Mauritius) was apparently of a uniform 

 bluish white, wherea.s this one is mottled with darker blotches. 

 Hence I desciibe it as a variety. 



7. Peltodoris axgulata, sp. n. 



One specimen from Chuaka. 



The animal has a close superficial resemblance to Thordlsa 

 villosa, but has six violet-brown spots symmetrically arranged in 

 rows of three on each side of the median dorsal line between the 

 rhinophores and branchiae, and some round chocolate spots on 

 the under edge of the mantle near the foot. The violet spots 

 seem to be under the surface and visible through the dorsal skin. 

 On a closer examination the superficial resemblances disappear : 



[l^j 



