64 SIR CHARLES ELIOT oisi [May 6, 



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

 pink and the knobs of a brilliant white, with a white sti-eak 

 extending upwards and sometimes with white spots below. The 

 back, cerata, rhinophores, and tentacles are covered with small 

 spots of the same colour as the body but darker. The rhinophores 

 have usually, but not always, dark circular bands. The intestines, 

 which are clearly visible, are light or dark yellow. 



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

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

 a single rov/ 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 reproductive 

 system. 



The general characters and inflated cerata of this genus resemble 

 the Tergipedince, and the figures of Capellinia Gcqjellinii (by 

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

 represent the cei-ata of these species as nodulous. But the 

 Tergijyedince have the foot rounded anteriorly, and the arrange- 

 ment of the cerata in this animal is peculiar ; it therefore 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 Zanzibar four 

 specimens of a nudibranch closely allied to Scyllcea, though 

 strikingly different in external appearance. The four specimens 

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

 one may prove to be merely a weU-marked variety. The animal 

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

 the original authorities, but Fischer's ' Manuel de Conchyliologie,' 

 p. 536, says : " Le geni-e JSferea, Lesson, 1830, a ete place dans le 

 voisinage des Scyllcea. Rhinophores courts, coniques, cilies, visibles 

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

 avant ; corps foui-nissant de chaque cote deux lobes ; branchies 

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

 From this description and from the fact that Bergh, in his ' System 

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

 may be presumed that the characters are not sufiiciently defined 

 to constitute a valid genus. 



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

 general appearance superficially resembles Elysia and in no way 

 recalls Scyllcea, which, however, I have never seen alive, althougli 

 I 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 Scylloia, and are not constricted at the 

 base. The animal when crawling generally directs them laterally. 

 The colour is vivid green, hai-monizing 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 



