242 MESSRS. COLLINGB AWD GODWIN-ATTSTEN ON [Mar. 19, 



exist between the slug-like molluscs and those possessing a more 

 perfect shell ; further, an investigation of their anatomy is likely 

 to throw considerable light upon the relations and position of such 

 genera as Parmarion, Microparmarion, Damayantia, and Marietta 

 on the one hand, and Girasia, Austenia, Ibycus, and MacrocJilamys, 

 &c. on the other. 



Damayantia, Issel, 1874. 



II. Damayantia smithi, n. sp. 



iShell (fig. 4) broadly oval, with a slight indication (a mere 

 impression) of the apical whorl, the whole of an equally membra- 

 naceous and thin texture, transparent, shiny ; when removed from 

 the animal in alcohol it becomes much contracted by wrinkling, 

 in the fresh state it would be convex in outline and of a pale 

 olivaceous colom. 



Major diameter about 12 millim. 



Animal (figs. 1-3). — Grround-colour pale ochre in alcohol, 

 tentacles black or very dark blue, a very dark blue or black 

 streak runs along the side of the foot posteriorly, crossing it 

 diagonally downwards to the mucous pore. The dorsal lobes are 

 streaked and mottled with jet-black on a yellowish-grey ground, 

 this being more conspicuous anteriorly. The black markings on 

 the shell-lobes are concentrically arranged as regards the edge of 

 the shell : in the specimens examined they are probably much 

 contracted, but in life would cover the greater portion of the 

 shell ; they are probably very similar in size to those of Damayantia 

 dilecta, Issel (4. pi. iv. figs. 5, 6). 



The mantle differs very much from that of the typical Girasia 

 (1) ; in this Bornean slug the left shell-lobe has been developed to 

 a greater extent than the right, and extends back behind the 

 respiratory orifice, even posterior to the apex of the shell, and it is 

 clearly defined by the white edging. On the left anterior margin 

 a cicatricial line marks very distinctly where the shell and dorsal 

 lobes meet. The left and right are continuous all round, the left 

 being the larger and concealing the head of the animal. The foot 

 posteriorly is long and narrow, sharply keeled, and terminates 

 abruptly. Foot-sole divided into three distinct planes, faintly 

 marked with transverse lines, colour yellowish brown. Foot-fringe 

 slightly darker than the foot-sole ; two r ows^ of jel ongated rugae 

 arranged in parallel rows lie above t lie Toot-fringe. Large Imear 

 miicous pore (fig. 6) not extending to the foot-sole. The paUial 

 margin is well marked, as is also the pallial line, which is deeply 

 crossed by grooves into oblong spaces. 



The animal in alcohol measured 28 miUim. in length, breadth of 

 foot-sole in the anterior region 4| millim. 



Hah. Poeh Mountain (3500 ft.), Sarawak {A. H. Everett). 

 It gives us much pleasure to associate with this most interesting 

 mollusc the name of Mr. Edgar A. Smith, F.Z.S., of the British 

 Museum. 



