PULMONATA. 121 



keel, ratlier shining, horn-coloured ; spire conic, with concave 

 outlines and the apex rather blunt ; suture flat ; whorls seven, 

 flattened, slowly increasing, the last one not descending, showing 

 a brown band on the compressed, sharp keel, rather convex be- 

 neath and impressed in the centre ; aperture oblique, depressed- 

 rhomboidal ; peristome simple, straight, sharp, with the colu- 

 mellar margin a little thickened above. Height 8, greatest 

 breadth 18, least breadth 16 mill. {Pfr.) 



Helix conoicoides, Metcalfe in Proc. Zool. Soc. 1851, p. 71- 



Beeve, n. 449. t. 84. 



Pfr. Ic. n. 1020. t. 153. f. 20, 21 ; Mon. Suppl. 37. 

 Hah. Borneo. 



128. NaninaTais. 



Shell imperforate, convex on both sides, keeled, rather thin, 

 shining, horn-colom-ed yellowish or brownish horn-coloured, di- 

 stinctly striated and very obsoletely decussated by s]iiral impressed 

 lines ; sj)ire convex ; apex blunt ; suture impressed, bordered ; 

 whorls six, scarcely a little convex, increasing gradually, the last 

 not descending, acutely keeled, cimvex beneath ; apertui'e nearly 

 perpendicular, quadrangular, somewhat callous within ; ])eristome 

 simple, straight, sharp, with parallel margins, right margin short, 

 basal margin slightly arched, columellar margin entering, decli- 

 vous, callous, (hlated above. Height 7, greatest breadth l.'-J, 

 least breadth 12 mill. {Pfr.) 



Helix Tais, Hombron Sf Jacquinot, Voy. au Pol Sud, Moll. t. 7. 

 f. 42-45. 



Pfr. Mon. Suppl. 37. 

 Hehx Thais, Pfr. in Z. f. M. 1849, p. ^^ ; Ic. n. 782. t. 125. 

 f. 32, 33. 



Reeve, n. 598. t. 107. 

 Helix tropidophora, A. Adams Sf Reeve, Voy. Samarang, Moll. 

 59. t. 14. f. 14. 



Reeve, Conch. Icon. n. 581. t. 105, and var. t. 107. f. 601. 

 Hab. IVIarquesas Islands and Borneo. 



129. Nanina Brookei. 



Shell subperforate, reversed, solid, turbinate, keeled, with 

 crowded stria3 and minute granulations, undulated above by large, 

 forward descending folds, shining, chestnut-coloured ; spire sub- 

 turbinate, rather pointed ; whorls five, nearly flat, inflate below 

 the suture, the last one rather obtusely carinate, ventricose, striate 

 and minutely foveate, blackish beneath ; aperture oblique, rather 

 quadrangular, bluish-white inside ; peristome simple, straight, 



G 



