1903. ] FROM EAST AFRICA AND ZANZIBAR, PATI 
having been distinguished by any difference or intensity of colour. 
It exactly resembled a piece of the racemose seaweed (Caulerpa) 
on which it was found, 
The length of the alcoholic specimens is 2 centim.; the extreme 
breadth of the back with cerata 8 millim., and of the foot 2°3 millim. 
The rhinophores are long and distinctly canaliculate. There are 
no oral tentacles, but two lobes over the mouth. Behind the 
rhinophores are two very distinct black eyes. The cerata are 
club-shaped as in Galvina, of varying size, the largest inside. On 
each side of the back are four clumps of about nine cerata each, 
and there is a thick bunch on the tail, which, however, projects a 
considerable distance behind the last cerata. Down the centre of 
the back is a broad bare space, in the anterior portion of which 
is the very large, elongated (not oval) pericardial prominence. In 
front of this and fused with it is the vent, a large and conspicuous 
tube. The foot is rounded in front. 
I dissected one specimen, but was unable to obtain a clear view 
of either the central nervous system or the reproductive organs. 
The latter, as usual in this family, were extremely complicated, 
both the prostate and albumen-gland appearing to be extensively 
ramified. The verge was armed with a small spine. The hepatic 
diverticula in the cerata, being colourless, were not easy to dis- 
tinguish, but appear not to be much ramified and to resemble the 
figure of those in Hreolania siottii in Trinchese, pl. ix. fig. 2. 
The mouth-parts, buccal muscles, radula, &e. are of the usual 
ascoglossan type. The teeth are not unlike those of Ercolania 
viridis (v. Bergh, l. c. pl. xii. figs. 3 & 4), but the dorsal surface 
is a simple curve and does not show any depression. The upper 
portion of the radula contains 6 teeth, the lower 27, the last 
members being arranged ina spiral like that depicted in Trinchese’s 
plate of Z. siottii (pl. x a. fig. 1), from which it may be concluded 
that the individual is young. 
As the specimen presents all the characters of the genus Hrco- 
lania, I describe it under that name, but I feel very doubtful if 
the genus is valid. The only characters which differentiate it 
from Stiliger, viz. that the rhinophores are canaliculate and the 
pericardial prominence elongate and not oval, are surely very 
slight. Vayssiére (J. c. p. 122) referred to the genus a species 
(funerea) with entire rhinophores, which is probably in any case 
a Stiliger. 
The animal is not likely to be specifically identical with 
L. viridis Bergh, for the coloration is not really the same, the size 
is much larger, and the shape of the teeth somewhat different. 
iW 
