1S91.J 



LAND-SHELLS FROM BORNEO. 



45 



lunate ; peristome reflected upon the columellar margin, which is 

 very oblique. 



Size : maj. diam. 9*3; alt. axis 8"0 millim. 



Hab. Tiga Island, Borneo {A. Everett). 



Only one specimen in the collection. 



Helix (Geotrochus) subflaa^a, n. sp. (Plate II, fig. 4.) 



Shell pyramidal, keeled, rather flat on the base, narrowly perforate ; 

 sculpture, rough papillate dottings arranged transversely ; colour 

 ochre ; spire tigh, sides flat ; apex very blunt ; suture linear ; whorls 

 6, sides flatly convex ; aperture quadrate ; peristome very thin ; 

 columellar margin much reflected, perpendicular. 



Size: maj. diam. 7"0; alt. axis 6'5 millim. 



Hab. Borneo (Sir H. Low, in coll. Dr. Humgerford). 



This is the first species of this genus found in Borneo, The type 

 species is from Ternate, and the genus ranges through New Guinea 

 to the Solomon Islands, where it appears to be abundant ; whether 

 the animal is the same throughout this extended distribution is yet 

 to be found out. 



Helix pulvisculum, Issel, Ann. Mus. Civ. Genova, vi. p. 406, t. v. 

 figs. 24-27 (1874), 

 Locality not given. 



There are some species of Helicostyla and Cochlostyla repre- 

 sented in Mr. Everett's collection, but these are from Palawan. As 

 this is a large island with a Molluscan fauna somewhat difi'erent 

 from that of Borneo, I think it better to record them in a separate 

 paper, in which I shall describe the shells from Palawan collected 

 by Mr. J. Whitehead. 



Cochlostyla jayana. 



Hab. Lobok Antu, Batang Lussen District {Hose). 



DESCEIPTION OF THE PLATES. 



Explanation of the Abbreviations. 



Al.Gd. Albumen-gland. 

 ant. Anterior. 



C. Central tooth. 



D. Dart-sac. 



d. Calcareous dart. 

 E. Retracted eye-tentacles. 

 Gen.Ap. Generative aperture. 

 h.d. Hermaphrodite duct. 

 K. Kale-sac. 

 l.d.l. Left dorsal lobe. 

 l.s.l. Left shell-lobe. 

 M. Mouth. 

 M.G. Mucous gland. 

 M.G.B, Mucous gland of dart-sac. 



ov. Oviduct. 

 P. Penis. 

 P.Ap. Penis aperture. 

 post. Posterior. 

 r.d.l. Eight dorsal lobe. 

 r.m. Retractor muscle. 

 r.m.P. Retractor muscle penis. 

 r.s.l. Right shell-lobe. 

 Res.Ap. Respiratory aperture. 

 Res. Or. Respiratory organ. 



Sp. Spermatheca. 

 Sp.Ap. Spermatheca aperture. 

 v.d. Vas deferens. 

 X. Position of calcareous dart. 



