117 



postice marginato, infra in angulum desinente ; umbilico 

 clause, calloso ; operculo corneo, tenui, spirali. 



Shell somewhat globose, with a conoidal spire, and five 

 volutions, whose surfaces are flattened, of a pale colour, 

 varied with brown; suture inconspicuous; aperture nearly 

 circular, its columellar side somewhat angular ; columella 

 nearly straight, rather oblique ; peritreme reflected, rounded 

 edged, bordered behind, and forming an angle at the lower 

 part; umbilicus closed with a callous covering; operculum 

 spirab horny, thin. Sumatra. 



76. C. ciTRiNUM, (pi. XXV. f. 104.) nob. 



T. subglobosa, spira conoidali, anfractibus 5, ventri- 

 cosis, pallide aurantiacis, superne spiraliter striatis, infra laevi- 

 gatis : sutura distincta ; apertura circulari, peritremate valde 

 reflexo, rotundato, albo ; umbilico magno, spiraliter sulcato. 



Shell subglobose, with a conoidal spire ; volutions five, 

 ventricose, pale orange coloured, spirally striated on their 

 upper parts, and smooth below ; suture distinct ; aperture 

 circular, peritreme very much reflected, rounded, white ; 

 umbilicus large, spirally grooved. 



77. C. CANDiDUM. (pl.xxvi, f. 107-) nob. 



T. subglobosa, spira obtusa; anfractibus 5, rotundatis, 

 spiraliter sulcatis, candidis ; apertura subcirculari, superne 

 acuminata : peritremate incrassato, superne subsinuoso : 

 infra externe crasso, reflexo ; margine interno calloso, supra 

 umbilicum magnum partim extenso. 



Var. callo umbilicali minore, reflexo. 



Shell nearly globular, with an obtuse spire, consisting of 

 five rounded, spirally grooved, white volutions : aperture 

 nearly circular, acuminated at the upper part: peritreme 

 thickened, rather sinuous at the upper part, outer edge thick 

 and reflected at the lower part, the inner edge callous, and 

 partly extended over the large umbilicus. There is a variety 

 in which the umbilical callus is much smaller and reflected. 

 Sometimes the lower part of the upper volutions is of a rusty 

 brown colour. 



78. C. NATicoiDE. (pi. xxvi. f^ 108. 109.) Reclus Rev. 

 Zool. 1843. p. 3. 



T. subglobosa, crassa, albicante, interdum pallide fulves- 

 cente, laevigata, lineis levatiusculis striisque transversahbus 

 irregulariter clathrata ; spira brevi ; obtusa, anfractibus quinis, 

 rotundatis, postice tenerrime striatis, et concinne decussatis ; 

 ultimo maximo ventricoso ; sutura distincta, tenui ; apertura 



p 



