384 SIR C. ELIOT OX XUDIBRAXCIIS [DpC. 1 , 



The teeth are simply liamate ; the innermost are smaller ; the 

 outermost smaller and imperfect in shape, bifid or irregularly 

 serrulate. The stomach is large, muscular, and free from the 

 liver. 'No armature was visible in the reproductive apparatus, 

 and the genital orifices were unusually small and inconspicuous. 



On the light side of the liver was found a parasite (PI. XXXIY. 

 fig. 4), extending from the fore end halfway down, the head being 

 bent downwards round the foi-e end of the liver. The impression 

 of the parasite on the liver was very distinct. 



This foi-m has not the hard feeling characteristic of Sclerodoris, 

 but as the back is leathery, reticulate, and granulate, I hardly 

 think it advisable to eremite a new genus for its reception. 



30. AsTEROXOTUS HEMPRiCHi Ehr. (Plate XXXIV. figs. 5 & 6.) 

 [Ehrenbei'g, Symbols Physical, Animalia Evertebrata, 1831. J 

 This large animal is common under I'ocks at Zanzibar and in all 

 parts of British East Africa, between tides. 



It has a characteristic feeling like leather or india-rubber, and 

 not hard or rough like Platydoris. The ground-colour vaiies 

 from black to olive or chocolate-brown. The skin is quite smooth, 

 but bears a number of iri-egular lumps, resembling blistei's in 

 appearance. Towards the edges of the mantle they are smaller 

 and somewhat confluent. Down the centre of the back runs a 

 nioi-e or less elevated lidge, vaiying much in different specimens. 

 All these protuberances are of a much lighter tint than the i-est 

 of the body. In some specimens thei-e ai-e small white lines round 

 the lumps. The large bi'anchife are white or pinkish. The under- 

 side of the mantle is light yellow, with a row of chocolate blotches 

 forming a line round the margin of the mantle and another round 

 the foot. The coloration shown in the figure (Plate XXXIV. 

 fig. 5), though an accui-ate representation of some specimens, is 

 not the commonest. The greater number of individuals are more 

 distinctly green. The animals are sluggish and show little 

 inclination to move. The branchife are comparatively insensitive. 

 Though completely retractile, they are not hidden when the teeth 

 close over the pocket, but can be cleai-ly seen at the bottom of the 

 cavity (PI. XXIV. fig. 6). 



The largest alcoholic specimen measures 8*3 cm. in length by G, 

 and is 2*4 cm. high. The foot is 6 in length by 1'5 ; the anterior 

 margin is deeply notched and grooved, the upper flap being very 

 ample. The tentacles are lai-ge and in two specimens show a 

 rudimentary foliation resembling that of Hexabranchus. This 

 may be due to artificial compression, but I am not sure. The lips 

 are also ample and protruding, so as to look like a second pair of 

 tentacles. The rhinophore-pockets ai'e somewhat raised and 

 smooth, sometimes distinctly bilabiate. The bi-anchipe are six, 

 ample, and quadi-ipinnate. The margin of the pocket is produced 

 into six lobes, which paitially close over it. The radula consists 

 of about 32 I'ows, each containing about 45 large yellow teeth on 

 either side of the wide, naked rhachis. The teeth are simply 

 hamate : the outermost two or three are smaller, and the innei'- 

 [32] 



