82 
SPOLIA ZEYLANICA. 
the back, and caudal crest. There is a small accessory lobe on the 
left side between the two cerata, arising from the base of the 
anterior one. It looks as if it were a monstrosity, but it is 
remarkable that in A. & H.’s figure there is also a small additional 
excrescence on the left side. 
The internal organs are much as described by Bergh for Sc. pda- 
gica var. orientalis. The buccal parts, both jaws and teeth, are not 
materially different from those of the typical species. The formula 
of the radula is 20 X 231*23 in the longest rows. The median 
teeth have 4 or 5 denticles on either side, the laterals 4-6. After 
receiving the ducts of two branched salivary glands, the oesophagus 
dilates into the somewhat wider but elongate and tube-like first 
stomach. This is followed by the more globular second stomach, 
which bears a band of twenty horny plates. They are not very 
strong, white with yellow edges, and triangular in shape. Large and 
small plates alternate regularly. The whole alimentary tract is 
profusely but not uniformly spotted with little brown dots. The 
liver appears to be divided into three parts, one anterior and two 
posterior. The posterior portion, if not actually double, is at any 
rate deeply divided. The hepatic branches are few, colourless, 
and small. I was unable to trace them beyond the immediate 
neighbourhood of the liver. 
The central nervous system, like the alimentary canal, is profusely 
spotted with brown. In the ganglia the cerebral and pleural portions 
are distinct. The pedal ganglia are large and rather elongate ; the 
buccal round and close together. In the anterior portion of the 
genitalia the twisted vas deferens and the spermatotheca are both 
bright brown, and contrast vividly with the white albumen gland on 
which they lie. 
This species appears to be both the Scyllcea marmorata of Alder 
and Hancock and the Sc. pelagica var. orientalis of Bergh. It is hard 
to say whether it should be given specific rank or not. But it has a 
characteristic appearance and does not resemble any Sc. pelagica 
that I have ever seen, so I think A. & H.’s specific name may be 
employed, at least provisionally. 
Hexabranchus marginatus (Q. & G.). 
= Doris gloriosa, Kelaart I., p. 291. 
See Quoy and Gaimard on Doris marginata. Voy. de V Astrolabe 
Zool. II., 1832, p. 255, PL 17, figs. 1-5, and Bergh, Siboga Exped. 
Opisthob., 1905, p. 90 and PL I., fig. 2. 
One specimen of this fine species from Colombo Breakwater. 
When alive it was 6 inches long and from 3J to 5 inches broad, 
according to its state of expansion. 
A diagram of the colours shows that it was a typical specimen of 
H. marginatus , of which there is a beautiful drawing in Bergh’s 
account of the Siboga collection (1. c.). 
