254 SIR CHARLES ELIOT ON NUDJBRANCHS [Mar. 17, 



the cerata begin fui'tliei' l)ack and are set in groups. (2) In 

 B. moibii the reproductive oritice is under tlie third row of cerata, 

 and the vent between the sixth and seventh lows, ahiiost dorsal : 

 in B. major the reproductive orifice is under the first group of 

 cerata, and the lateral vent after the second. (3) In B. major 

 the basal part of the teeth is propoitionally narrower than in 

 B. mvehii, and the denticles are more irregular. 



Var. ORXATA. 



One sjjecimen captured at Chuaka, May 1902, seemed to ))e a 

 typical Boiolidla inajor, except for a somewhat moi-e oi-nate 

 coloration. The gi-ound-colour was of a yellowish- white with a 

 yellowish-brown pattern, consisting of a series of iri'egulaily shaped 

 lozenges containing white spots, down the middle of tlie back as 

 in B. major. The oral tentacles were white with green stiipes. 

 The cerata were white with yellow tips, below which was a bright 

 blue band. 



Ceeberilla africana, n. sp. 



(Bergh, Journ. Mus. Godef. Heft ii. 1873, & Heft vi. 1874; 

 Beitr. zur Kenntuiss der Aeolidiaden, Theil ii. ; Semper's Reisen 

 im Arch. Philipp., Malac. Untersuch. iii. p. 879.) 



One specimen from the reef Jembiani, Zanzibar, 3*5 centim. long 

 and 1'3 broad in life. The back was almost entirely covered with 

 cerata, so that the body-colour was hai-dly visible. Most of the 

 cerata were very dark green with a bright yellow ring, but the 

 innei-most were white with bluish tips, with only a ring of dark 

 gi-een. The oral tentacles were dark blue, with gi'een bases. The 

 rliinophores had four bands of colour, which were, starting from 

 the base, greenish brown, white, blue, white. On the head were 

 two yellow lines, extending from the oral tentacles to the rhino- 

 phores, and the margins of the head and foot were also of a blight 

 light yellow. 



The animal was stoutly built. The foot projected consideiubly 

 beyond the body on either side. Its anterior angles were expanded 

 into long tentacular processes. The head had also two lateral 

 expansions, fi-om which projected at right angles the very large 

 and conspicuous oral tentacles. In life the liiinophoi-es were 

 quite simple and fairly long. In the alcoholic specimen tliey were 

 contracted and somewhat wrinkled. The numerous and thick-set 

 cerata were disposed on peduncles. There was a bare triangular 

 patch behind the rhinophore, and a narrow bare space down the 

 middle of the back, but the cerata folded over the latter so tliat 

 neither it nor the transverse bare areas wei'e visible. Tliere were 

 about twenty transverse rows of cerata. Tlie first row at tlie side 

 of the ihinophores consisted of about 10 cerata, much smaller than 

 the rest. After the tliird i-ow was a distinct gap, and a smaller 

 gap after the foui-th. After that the rows were so close together 

 that they could not be distinguished superficially. The innermost 

 cerata were larger than the others, and sometimes bifid : small 

 cerata extended almost to the end of the verv shoi't tail. 

 [6] 



