1891.] LAND-SHELLS FKOM BORNEO. 39 



MiCROCYSTCNA CAVERNS, U. Sp. 



Shell depressedly globose, solid, imperforate; sculpture, distant 

 very fine longitudinal strise, on a smooth surface ; colour pale sienna ; 

 spire low, apex rounded ; suture impressed ; whorls 4, rather flat 

 above, the last rounded : aperture ovately lunate; peristome acute, 

 oblique ; columellar margin subvertical, thickened, reflected, with a 

 slight twist. 



Size: maj. diam. 3 6 ; alt. axis 1'3 millim. 



Hab. Borneo, cave-earth. 



The sculpture is exactly similar to the typical species from the 

 Andaman Islands. 



SiTALA (?) ANGULATA. (Plate IV. fig. 7.) 



Trocliomorpha (?) angulata, Issel, Ann. Mus. Civ. Genova, vi. 

 p. 40.5, t. V, figs. 5-8(1874). 



Shell pyramidal, with a raised fine rib on the keel of the last 

 whorl, finely perforate ; sculpture decussate, the regular oblique fine 

 costulation being crossed by regular spiral lines ; colour dark brown, 

 liver tint ; spire high, conical with slightly rounded sides ; apex 

 blunt ; suture impressed ; whorls 6, somewhat convex ; aperture 

 elongately oval ; peristome thin ; columellar margin subvertical. 



Size : maj. diam. 3"2 ; alt. axis 29 millim. 



Hab. Busan Hills {A. Everett). 



Issel places this in the genus Troehomorpha and justly with a 

 query. Its nearest generic position is Sitala, as seen in the spiral 

 lines of sculpture. The animal needs examination to ascertain if 

 it is like that of the Indian region. 



"O* 



SiTALA EVERETTI, U. Sp. (Plate IV. fig. 6.) 



Shell depressedly pyramidal, rounded below, imperforate, keeled ; 

 sculpture a dull smooth surface ; the spiral ribs very fine, 3 on each 

 whorl, evenly distributed, the one above the suture slightly the best 

 seen, close spiral striation at base ; colour pale ashy ; spire conical, 

 sides concave ; apex blunt ; suture shallow, marked by a fine thread- 

 like rib extending to the keel of the last whorl ; whorls 6, regularly 

 increasing, convex ; aperture semi-lunate ; columellar margin re- 

 flected, oblique. 



Size: maj. diam. 7 0, min. 67 ; alt. axis 4"5 millim. 



Hab. Niah Hills (^. Everett). 



This is an undoubted Sitala, a genus represented in Burmah and 

 India by S. infula, attegia, &c. Only one specimen in the collec- 

 tion, among a lot of small Hehces. 



SiTALA SINGtTLARIS, U. Sp. 



Shell pyramidal, sharply keeled, not umbilicated, solid ; sculpture, 

 10 fine lirate lines on each whorl; colour bleached; spire high, 

 sides very slightly convex ; apex papilliform ; suture shallow ; 

 whorls 6 ; aperture semi-lunate, subvertical ; peristome acute ; 



