62 SIR CHARLES ELIOT OX - [^^'0' ^J 



[From the Proceedi3S'gs of the Zoological Society or Loxdox, 

 May 6, 1902.] 



On some NuJibranchs from Zanzibar. By Sir Charles 

 Eltot, K.C.M.G., Commissioner and Consul-General in 

 the British East-African Protectorate. 



(Plates V. & VI.' and Text-figures 2-5.) 



During the last yeai- Mi-. Orossland has been most kindly 

 investigating for me the fauna of the eastern and western coasts 

 of Zanzibar. He has not oidy collected a large number of Opis- 

 thobranchs, but also greatly inci'eased the value of his collection 

 by drawings of the living animals. The present paper contains 

 some of the results of his labours in the shape of notes on 

 three apparently new genera of Nudibranchs — Zatteria, Dunyci 

 (^^olididye), and Crosslandia (Scyllajidee), and on two intei-esting 

 species on which little seems to have been wiitten since the time 

 of Alder aiid Hancock — Melihe Jiinbriata and Madrellaferrughwsa. 

 The ^olididaj are already divided into forty or fifty genei-a, and 

 it is with reluctance that I add to their number, believing that it 

 would more properly be reduced. But as long as the definitions 

 of the existing genera ai-e so minute and nai-i-ow, they cannot be 

 made to accounnodate fresh foi'ms, for which new, though pi-obably 

 only provisional, genera must be ci-eated. 



Zatteria browxi, gen. et sp. nov. (Plate VI. figs. 9-13.) 



Three specimens were found in seaweed collected on the I'eefs 

 lound Piison Island, in Zanzibar Harbour, in May 1901. The 

 largest was "8 cm. long by "2 cm. broad. The body is long and 

 naiiow, and tei-minates in a peculiarly slender- tail, which is neai-ly 

 a quarter of the length of the whole animal. The cerata are 

 miunged in eight transverse I'ows (PI. VI. fig. 10), each row contain- 

 ing eight ceiata, four on each side. The fiist two rows and the last 

 four ai-e ci'owded togethei-, but the two series in the middle ai-e 

 sepai'ated one fiom another and from the anteiior and posteiior 

 clumps by consideiable intervals. The most distinctive character 

 of the genus is the shape of the cerata (PI. VI. fig. 11), which are 

 not even but swell out into two or three projecting lings, the first 



^ For explanation of the Plates, see p. 72. 



[2] 



