dll 
FURTHER DESCRIPTION OF THE ANIMAL OF DAMAYANTIA 
CARINATA, COLLINGE, SHOWING ITS SIMILARITY TO 
D. SMITHI, COLLINGE & G.-A., WITH REMARKS ON THIS 
GENUS OF ISSEL, COLLINGEA OF SIMROTH, AND JSSELENTIA 
OF COLLINGE. 
By Lieut.-Colonel H. H. Gopwry-Avsren, F.R.S., ete. 
Read 13th March, 1903. 
PLATE XI. 
A sprctmEn labelled ‘‘ Damayantia carinata? Collinge,’’ has been kindly 
entrusted to me for dissection by Mr. Edgar Smith, of the British 
Museum (Natural History). It is the smallest of three sent from 
North Borneo by Mr. Shelford, and is the first Bornean slug-like 
molluse I have as yet seen in which the external form, and proportion 
of the parts to one another, correspond closely with Issel’s figure of 
Damayantia dilecta (1). Anyone making the comparison can feel very 
certain he has a representative species of Issel’s genus to deal with. 
When I joined Mr. W. Collinge in writing a paper on Bornean slugs 
in 1895 (2), the one species then placed in the genus, viz. Damayantia 
Smith’, was not quite so strikingly like D. di/ecta, a single example of 
which I have also lately examined at the British Museum. D. carinata, 
the subject of this paper, I consider is very close to the type. It should 
be borne in mind that in representations of these animals preserved 
in alcohol, the spread of the mantle-lobes over the shell is largely 
dependent (1) on the freshness of the animal when put into the spirit, 
(2) on the shrinking and crinkling they at once undergo. 
[ propose, in the first place, to describe the animal of D. carinata, 
and then to make some remarks both on the previous work by 
Mr. Collinge and myself in 1895 and on some of that which 
Mr. Collinge has since done. 
The length of the specimen of D. carinata, which was received by 
the British Museum in 1902, is 26mm. It is not a fully grown 
example, but is in fair preservation. Its most striking external 
character is the extremely long narrow foot, posteriorly much com- 
pressed at the sides and rising into a sharp dorsal keel, which 
terminates in an overhanging small lobe above a small mucous gland. 
(Pl. XI, Figs. 1 and la.) In this specimen there is no sign whatever 
of the jagged or toothed appearance of the keeled foot observed in the 
specimen of D. carinata described by Mr. Collinge. This appearance 
may therefore be due to epidermal destruction, produced by muscular 
splitting strain. As is well known by those who have collected these 
exotic slugs, and noticed by Semper and others, some species fling the 
tail right and left with great force and rapidity when they are touched, 
and will thus throw themselves off the hand; such action might 
readily split the very sharp line of the keel and the resultant fractures 
be intensified in the spirit. In such case it would not be a structural 
character to be used in a specific sense. ‘The sole is divided into 
a central and side areas. 
The general colour of the animal is pale ochraceous throughout, 
