254 SIR CHARLES ELIOT ON NUDIBRANCHS | Mar. 17, 
the cerata begin further back and are set in groups. (2) In 
B. mebu the reproductive orifice is under the third row of cerata, 
and the vent between the sixth and seventh rows, almost dorsal : 
in BL. 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 proportionally narrower than in 
&. mebii, and the denticles are more irregular. 
Var. ORNATA. 
One specimen captured at Chuaka, May 1902, seemed to be a 
typical Beolidia major, except for a somewhat more ornate 
coloration. The ground-colour was of a yellowish-white with a 
yellowish-brown pattern, consisting of a series of irregularly shaped 
lozenges containing white spots, down the middle of the back as 
in B. major. The oral tentacles were white with green stripes. 
The cerata were white with yellow tips, below which was a bright 
blue band. 
CERBERILLA AFRICANA, 0. Sp. 
(Bergh, Journ. Mus. Godef. Heft ii. 1873, & Heft vi. 1874; 
Beitr. zur Kenntniss der Aeolidiaden, Theil 11.; Semper’s Reisen 
im Arch. Philipp., Malac. Untersuch. 11. 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 hardly visible. Most of the 
cerata were very dark green with a bright yellow ring, but the 
innermost were white with bluish tips, with only a ring of dark 
green. The oral tentacles were dark blue, with green bases. The 
rhinophores 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 bright 
light yellow. 
The animal was stoutly built. The foot projected considerably 
beyond the body on either side. Its anterior angles were expanded 
into long tentacular processes. The head had also two lateral 
expansions, from which projected at right angles the very large 
and conspicuous oral tentacles. In life the rhinophores were 
quite simple and fairly long. In the alcoholic specimen they 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 that 
neither it nor the transverse bare areas were visible. There were 
about twenty transverse rows of cerata. The first row at the side 
of the rhinophores consisted of about 10 cerata, much smaller than 
the rest. After the third row was a distinct gap, and a smaller 
gap after the fourth. 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 very short tail. 
