MOLLUSCA OF INDIA. 55 



are very distinct. What Limax problematicus from Ceylon may be, 

 or what its relationship — perhaps with Mariella or DeJchania — 

 has yet to be cleared up, but we can consider Parmarion an essen- 

 tially Malayan form. 



Subgenus Damayantia. (Plate LXXIII, figs. 1-7 d.) 



Damayantia, Issel, " Mollusca Borneensis," Annali d. Museo 

 Civico Geneva, vol. vi. pp. 389, 390, pi. iv. figs. 5, 6 (1874), 



Type D. dilecta, Issel. 



Original description : — " Corpus elongatum, valde compressum, 

 fuscum vel fidvo-hdescens, tuberculis rJiomboideis parum elevatis 

 nigrescentihus munitum, antice subtruiicahirn, postice perattenuatum ; 

 pallium breve, valde iujlatum, ovato-rotundatum, paidum oblique 

 depressum, fulvimi vel fuscum, maculis 7iic/ris irregulariter aspersum, 

 antice noii adhcerens ; Cauda gracilis, valde compressa, acute carinata, 

 postice emarginata ; solea angustissima, lutescens, longitudinaliter 

 bisulcata. 



'^Long. 24-17^ et 10| mill." 



The above description does not go beyond the external form of 

 the animal, and it was not until 1894 that Mr. A. H. Everett, a 

 naturalist who has done more than any man to give us a knowledge 

 of the rich and beautiful molluscan fauna of Borneo, forwarded to 

 Mr. Edgar Smith some specimens of slugs from that island. These 

 were then examined in detail by Mr. Walter CoUinge and myself, 

 and the results were eventually published in the Proc. Zool. Soc. 

 1895, in a joint paper entitled " On the Structure and Affinities of 

 some new Species of Molluscs from Borneo." The anatomj of 

 Damayantia was taken from a species collected in the Poeh Moun- 

 tains, Sarawak, and named by us D. smitJii, after Mr. E. A. Smith, 

 of the British Museum, who had so kindly let us have the material 

 to work on. 



I take the following amended and fuller generic characters from 

 that species and give drawings of its anatomy : — 



Shell (fig. 2). Broadly oval, with a slight indication (a mere 

 impression) of the apical whorl, membranaceous and thin in texture, 

 contracting and wrinkling when removed from the animal. 



Animal (figs. 1, la, 16). Where black markings exist on the 

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

 the shell ; they also cover in life the greater portion of the shell, as 

 in Issel's figures. 



The mantle differs very much from that of typical Girasia. The 

 left shell-lobe has been developed to a greater extent than the right, 

 and extends back behind the respiratory orifice, even posterior to 

 r,he apex of the shell ; 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. 

 The foot posteriorly is long and narrow and sharply keeled. Foot- 

 sole with a central area, distinct from the sides. Large linear 



