64 SIR CHARLES ELIOT OX [May 6, 



transparent corata. But in all cases the tips of the cerata are 

 pink and the knobs of a brilliant white, with a white streak 

 extending upwards and sometimes with white spots below. The 

 back, cerata, rhinophoi'es, and tentacles are covei'ed with small 

 spots of the same colour as the body but dai'ker. The rhinophores 

 have iisually, bvit not always, dark circular bands. The intestines, 

 which are clearly visible, are light or dark yellow. 



The jaws are of moderate size ; the masticatoiy edge is bluntly 

 denticulate, but on the lower part only. The radula consists of 

 a single row of teeth. The central part of each tooth is pro- 

 longed into a short bluntish point ; on either side are three 

 denticulations. I could discover no armature in the i-eproductive 

 system. 



The general character and inflated cei-ata of this genus resemble 

 the Tergipedincp, and the figures of CapeUinia capeUinii (by 

 Trinchese) and those of Tergipes {CapeUinia) dorice (by Vayssiere) 

 I'epresent the cerata of these species as nodulous. But the 

 TergipedincB have the foot rounded anterioi-ly, and the ari-ange- 

 ment of the cerata in this animal is peculiar ; it thei-efoi'e seems 

 necessary to create a new genus for it. 



Crosslandia viridis, gen. et sp. nov. (Plate V. figs. 1-8). 



In July and September, 1901, were captured at Zanzibiir four 

 specimens of a nudibranch closely allied to ScyUcea, though 

 strikingly different in external appearance. The four specimens 

 seem to constitute a new genus and possibly two species, thovigh 

 one may prove to be merely a well-marked vai'iety. The animal 

 in question may possibly be a Nerea, Lesson. I have not access to 

 the original authoi-ities, but Fischer's ' Manuel de Conchyliologie,' 

 p. 536, says: " Le genre Nerea, Lesson, 1830, a ete place dans le 

 voisinage des ScyUcea. Rhinophores covirts, coniques, cilies, visibles 

 au dessus d'un petit voile frontal : tete courte, tronquee en 

 avant ; corps fournissant de chaque cote deux lobes ; bi'anchies 

 disposees en petites tovifies sur les lobes lateraux et svir la queue." 

 From this description and fi-om the fact that Bei'gh, in his ' System 

 der Nudibranchiaten Gasteropoden,' takes no notice of Nerea, it 

 may be presumed that the characters ai-e not sufficiently defined 

 to constitute a valid genus. 



The length of a large specimen is nearly 5 centimetres, and the 

 general appearance supei'fioially resembles Elysia and in no way 

 recalls ScyUcua, which, however, I have never seen alive, although 

 1 have examined numerous alcoholic specimens. The body is 

 fairly long ; it is produced into a neck and tail and laterally into 

 two wing-like lobes, one on each side, which are more or less 

 distinctly bifid, but in no specimen can be compared to the two 

 pair of cerata found in ScyUcea, and are not constricted at the 

 base. The animal when crawling generally directs them laterally. 

 Tlie colour is vivid green, harmonizing exactly with the young 

 leaves of Zostera on which the animal was found. At the side of 

 the body below the lobes is a row of irregular projecting sandy 

 [4] 



