136 PEOCKEDINGS OF THE MALACOLOGICAL SOCIETY. 



B. egena from Trieste, B. Reathi from California, and D. duhia and 

 I), egena from Tasmania. The genus is thus fairly widely distributed, 

 but seems to shun the northern Atlantic and the coasts of South 

 America. The allied Geitodoris, however, occurs in the former region, 

 and the Nudibranclis of the latter have been little investigated. It is 

 clear, however, that the genus is most abundant in the warmer seas. 



Many of the species recorded from the Atlantic have a harder 

 consistency than the more typical forms from the Indo-Pacific, and 

 this is certainly the case with the specimens noticed below. 



Bergh originally classified the Doris Ellioti of Alder & Hancock 

 (Notice of a collection of Nudibranchiate Molluscs made in India) as 

 Platydoris, but in his recently published account of the Nudibranchs 

 found by the Siboga he identities it with a Discodoris in that collection. 

 I have, however, examined the type-specimen preserved in the 

 Hancock Museum at Newcastle-on-Tyne, and ascertained that the 

 earlier classification under Platydoris is correct. The animal has no 

 lip plates, but a very strong armature of hook-bearing scales on the 

 genitalia. The Siboga specimens should perhaps be called Discodoris 

 Berghi, n.sp. 



Discodoris indecoka, Bergh. 

 Discodoris indecora, Bergh: Semper's Reisen, Supp., Heft ii, 1881, 

 pp. 108-112. 



Mr. Crossland's notes on the two living specimens are as follows : — 



" Dorid, blue grej*. Found among Nullipore nodules 5-10 fathoms 

 in Porto Grande, St. Vincent, and also under a stone in Porto Praya, 

 Santiago. About 18 mm. long by 10 mm. wide, white below, ot a cool 

 grey above with a bluish bloom. Quite smooth, no papilla3, but harsh 

 to the touch, very sluggish. Colour is modified by the presence of 

 minute black specks thickly sown over the dorsal surface. At a point 

 where the mantle joins the body dorsally is an irregular line of 

 irregular white blotches made up of opaque white specks, larger than 

 the black ones. 



" Rhinophores and gills both completely retractile. Both tipped 

 with white. The latter have an extraordinarily thick rhachis, and 

 the branched ])arts are extremely small, but it is possible that they 

 were not seen fully expanded. They appear to be bipinuate. The 

 specimen from Porto Praya has no bluish tint, and is of a cool grey 

 colour. Gills as described, even when fully expanded, 4 in number, 

 bipiunate and not so very small. This specimen is warty, and the 

 other markings, etc., are as above." 



The preserved specimen from Porto Praya is of a cool grey colour, 

 and hard and stiff in texture. It is much bent, but, if straightened 

 out, would be about 30 mm. long and 15 mm. broad. It is verj' flat, 

 the maximum height being only 5 mm. On the outer parts of the 

 dorsal surface are scattered tubercles, extending 5-8 mm. inwards from 

 the margin. They are of various sizes, the largest being about a 

 millimetre broad and half a millimetre high. The middle of the back 

 appears smooth, but under the lens shows indications of obscure flat 

 tubercles. The spaces between the tubercles are finely granulated. 



