CONTRIBUTIONS TO A KNOWLEDGE OF THE 

 MOLLUSCA OF BORNEO. 



(PART !•) 



By WALTER E, COLLINGE, M.Sc, 

 The Uxiversity, Birmingham. 



(Plates vii. and viii.) 



In June, 1901, I gave a short account of a small collection of slug-like 

 molluscs from N.W. Borneo ''' for which I was indebted to the kindness of 

 Mr. R. Shelford, of the Sarawak Museum. Since then he has very kindly 

 sent me two further collections, some of which form the subject of the 

 present paper. 



Damayantia, Issel. 

 Damayantia dileeta, Issei. 



Damayantia dileeta, Issel : Moll. Born., 1874, p. .390, T. iv, figs. 4-6. 



i7a&.— Matang, 2,500 feet. 



The two longitudinal median furrows mentioned by Issel (Moll. 

 Born., p. 28), and which were not discernible in the specimens I have 

 previously examined from Mt. Penrissen, are very clearly marked in these 

 specimens. They are really a double row of median rugae, with deep 

 sulci between, so that there are three grooves formed by the deep inter- 

 vening sulci. 



Damayantia simrothi, n.sp. 

 PI. vii, figs. 1, 2. 



Animal a slaty blue, with anterio-lateral portions a bright yellow. 

 Mantle smooth and completely covering the shell. The Iceels are yellowish 

 and well developed on the lateral portions of the visceral mass. Head 

 and tentacles slaty blue. The dorsum exhibits a sharp yellow keel which 

 slopes downwards from behind the visceral mass posteriorly. The rugae 

 are ill-defined excepting posterio-laterally, where they are somewhat 

 more distinct. Caudal mucous pore small. Peripodial groove indistinct. 

 Foot-fringe bright yellow in anterior two-thirds, bluish in the posterior 

 third ; lineoles exceedingly faint. Foot-sole yellow, narrow, and divided 

 into median and lateral planes. 



* My best thanks are here tendeied to the Counoil of the Birmingham Natural History 

 and Philosopliical Society, for their kindness in defraying the cost of tlio original drawings. 

 1. Trans.',Roy. Soc. Edinb., 1901, vol.xl., pp. 295-312, Pis. i-iii. 



