382 SIR C. ELIOT OX XL'BIBRANCHS [DeC. 1, 



some of which are grooved outside and thus appear double. The 

 branchiae are eight in number, tripinnate, and very much 

 retracted. The rhachis is very stout and strong. 



27. SCLERODORIS MINOE, Sp. n. 



One specimen from Chuaka. 



The hving animal is described as superficially resembling 

 Platydoris papillata, differing only in that the dorsal surface is 

 covered with ridges which form a luised reticulate pattern. The 

 colour was a uniform greyish bi'owii, with a few patches 

 resembling adherent sand. The underside of the mantle was 

 warm grey with minute brown spots, the foot dirty orange. The 

 gill-pocket did not close completely when the branchiae were 

 retracted. 



The alcoholic specimen is 2*7 centimetres long, 1*6 broad, and 

 1*1 high. The texture is rough and leathery, with the peculiar 

 feeling common in Platydoris. All the dorsal surface, including 

 the reticulations, is covered with minute tubercles. There is a 

 rather indistinct median keel, from each side of which extends 

 a somewhat irregular reticulate pattern. The rhinophore- openings 

 are slightly i-aised and very slightly crenulate. The branchial 

 pocket is also slightly raised, of irregular shape, but not 

 crenulate, lidged vertically, and nearly but not quite closed. The 

 branchiae are eight, the two posterior shorter than the rest ; 

 the others are tall, thin, and sparse, so that in the alcoholic 

 specimen they appear simply pinnate, though they are really bi- 

 and sometimes tripinnate. The foot is rather broad ; the front 

 notched and the upper lamina apparently attached to the head, at 

 the side of which are the conical oral tentacles. The snout is 

 protruded. There are scattered minute rods in the labial cuticle, 

 but they are not combined into plates. The radula consists of 

 33 rows of yellow, regular hamate teeth, which do not diminish 

 much in size, either at the rhachis or at the end of the rows : 

 there are about 45 on the complete rows on each side of the 

 I'hachis. No genital armature was discernible. 



This specimen bears a strong general resemblance to Sclerodoris 

 tuhercidata, and may perhaps be a young individual of the same 

 species. The radula is, however, not quite the same, there are no 

 pits on the back, and the reticulate pattern is more distinct than 

 in the larger animal. It is possible that as the animal becomes 

 older the tubercles and pits may develop at the expense of the 

 pattern. 



28. Sclerodoris rubra, sp. n. 



One specimen from the reef ofi" the East Coast of Zanzibar. 



The living animal bears a most remarkable resemblance to a 

 vermilion sponge which is common at Zanzibar. It was not, 

 however, found on the sponge, but alone among Zostera near the 

 shore, and not in anyway concealed. It was picked up under the 

 impression that it was a species of sponge. The colour was red, 

 with some very natural-looking sandy patches. The texture was 



