ELIOT— NUDIBRANCHS. 419 



back. The jaws bear a single row of denticles. The formula of the radiila is about 

 45 X 25 + 1 + 1 4- 1 + 25. The stomach is armed with about 70 plates. 



This seems to be Rlippell and Leuckart's M. cyanohranchiata from the Red Sea, 

 described rather more fully by Mr. Crossland and myself, I. c. It is probably a highly- 

 coloured variety of the widespread Indo-Paciflc form called by Bergh M. m'borescens, 

 but the specific name cyanohranchiata has priority. As far as can be judged from their 

 present condition, these specimens belong to the highly-coloured form. 



5. Hexabranchus marginatus, Quoy & Gaimard. 



Two rather small specimens, measuring respectively about 65 and 40 mm. in length, 

 50 and 35 mm. in breadth. They are labelled " Amirante: depth 25-80 fms." 



The specific divisions of HexahrancJms are extremely doubtful, and it is highly 

 probable that all the commoner forms are varieties of a single species, though S. adamsii, 

 Gray { = M, punctatus, Bergh), may be entitled to specific rank. The present specimens 

 are probably referable to H. marginatus, Q. & G., which is abundant on the east coast 

 of Africa. 



6. Carminodoris clavata (Eliot). 



= Artachaa clavata, Eliot, in Joum. of Conchology, Oct. 1905, pp. 81-85. 



One small specimen, about 30 mm. long and 18 mm. broad, labelled " Coetivy ; Diver: 

 32 feet." The colour is purplish with lighter mottlings, and the warts on the dorsal 

 surface very flat. The internal and external characters agree with those described by 

 me for Artachcea clavata, 1. c. 



I think, however, that as long as the present genera of Dorids are accepted, this 

 animal should be referred to Carminodoris rather than to Artachcea. I did not refer 

 it to the former genus on account of Bergh's statement of the generic characters as 

 " Corpus sat moUe, notseo minute papillatum .... radula pleuris multidentatis, dentibus 

 hamatis." This formula does not seem applicable to a hard animal studded with large 

 distinct warts and having denticulate teeth. But I have recently had an opportunity of 

 examining the original specimens of Carminodoris hlandula in the collection of the 

 Siboga Expedition, and find that in them the dorsal surface is tuberculate and aU the 

 teeth denticulate. These specimens and the animal which I previously called Artachcea 

 clavata seem to me to belong to the same genus, though to different species. Carmino- 

 doris should apparently be defined as possessing a tuberculate back, a labial armature, 

 denticulate teeth, a prostate, and an armature of spines on the male genitalia. 



But I am by no means certain that, in a general revision of the Dorididae, the genus 

 Artachcea (1881) ought not to be extended to include the later Carminodoris (1889). 

 Eor the tuberculate back of Carminodoris seems to dissociate it from Discodoris, to 

 which Bergh allies it. It is not clear whether the type specimen of Artachcea had a 

 distinct prostate or not. Bergh says of the vas deferens " Der obere (prostatische) 

 Theil weicher." 



I have not had an opportunity of examining the original specimens of Artachcea or of 

 Carminodoris mauritiana, Bergh. 



SECOND SERIES. — ZOOLOGY, VOL. XIII. 56 



