630 MR. C. BOCK ON SHELLS FROM [May]?, 



which descends considerably, and the peristome is almost continuous 

 and ovate. I have associated with this shell the name of Mr, Edgar 

 Smith, the well-known conchologist of the British Museum. 



9. Helix (Geotrochus) rufo-filosa, sp. nov. (Plate LV. 

 fig. 4.) 



Shell shortly conical, narrowly umbilicated, thin, semitransparent, 

 of a greyish or horn-colour, sometimes with a thread-like red line 

 bordering the sutures and encircling the last whorl at the periphery. 

 Spire with rectilinear outlines, converging at an angle of about 

 30°, rather obtuse at the apex. Whorls 7, very obliquely striated, 

 slowly increasing, keeled beneath immediately above the suture; 

 three or four uppermost rather more convex than those beneath, 

 which are but slightly so ; last volution acutely carinate at the 

 middle, and convexly flattened beneath. Aperture small, oblique. 

 Peristome thin, outer margin above the keel scarcely expanded, 

 beneath it feebly thickened and narrowly reflexed, in the umbilical 

 region more expanded and partly concealing the perforation. Length 

 from 10 to 11 millim., greatest diameter of base also 10-11 miUim. 



Hab. In the forest at Paio, 1500 feet above the sea. 



Only six specimens found ; rare. 



10. Helicarion sumatrensis, Schepm. 

 Hab. Paio ; very rare. 



11. BuLiMUs (Stenogyra) paioensis, sp. nov. (Plate LV. 

 fig. 5.) 



Shell elongate, subulate, imperforate, of a dirty greyish-white 

 colour, covered with a somewhat deciduous and coarsish olive epi- 

 dermis. Whorls 12, apical ones obtuse, glossy, vitreous, these and 

 the few succeeding rather convex and slowly enlarging, the five last 

 proportionally longer and flatter, increasing more in length than 

 breadth, and separated by a rather oblique deepish suture. Sculp- 

 ture consists of coarsish oblique flexuous, indistinctly subgranose 

 raised lines of increment. Aperture elongate, subpyriform, acute 

 above, occupying rather more than one fifth of the entire length of 

 the shell. Outer lip (viewed laterally) oblique, a little excurved 

 near the suture, simple, thin. Columella whitish, slightly arcuate 

 and thickened, appressed to the whorl, connected with the extre- 

 mity of the labrum by a very thin callosity. Length 40 millim., 

 diameter 7i millim. ; aperture 9 millim. long, 3 millim. broad. 



Hab. Paio, Sumatra, 1500 feet above the sea. 



The animal is of a yellow colour, has a short foot, and carries its 

 shell in an oblique position. 



1 never met with this interesting species in any other spot in the 

 highlands ; and even at Paio it appears to be rare ; for in all, after 

 close search, I found but fourteen specimens. 



12. BuLiMUS (Amphidromus) adamsi. Reeve. 

 Hab. Sidjoeudjoeng, Paio, &c. 



