256 LIEUT. -COL. H. H. GODWIN-AUSTEN ON [Feb. 1, 



longitudinal ribs on the periphery, with a fine intermediate one, and 

 two above near the suture, crossed by strong lateral close ribbing or 

 lines of growth ; similiar longitudinal sulcation on the base, smooth 

 on the apex ; colour white, ruddy within the aperture ; spire pyra- 

 midal, sides flat ; suture shallow ; whorls 5^, convex, the last 

 slightly descending near the aperture ; this is circular and oblique ; 

 peristome rather thin. 



Operculum subtestaceous, paucispiral. rapidly increasing, nu- 

 cleus subcentral (fig. 3 b). 



Size : — 



Major diam. 10*0, minor diam. 9'2, alt. axis 64, total alt. 9*0 millims. 

 „ 0-39, „ „ 0-36, „ 0-25, „ „ 024, inch. 



["From stems of Draccena cinnabari, Balf. fil on 



limestone, at an altitude of over 2000 ft," (B. B.)] Fifteen speci- 

 mens were found. 



Two specimens are somewhat larger, and, being older, have flatter 

 sides to the spire, and a blunter apex. They measure respectively : — 



1. Major diam. 120, minor diam. 10*8. 



0-47, „ „ 0-43. 



2. „ „ II'O, ,, „ 9*5, alt. axis 6"0 millims. 



Tropidophora balfouri, n. sp. (Plate XXVIII. fig. 4.) 



Shell elongately pyram idal, umbilicated, keeled, solid ; first two 

 apical whorls smooth, rest of shell ribbed spirally and on the 

 base ; seven ribs on each whorl, crossed by well-developed transverse 

 ribbing ; colour marbly white, ruddy brown or orange within ; spire 

 pyramidal acuminate, sides flat ; suture shallow ; whorls 6, sides 

 convex, the last descending very slightly near the peristome ; 

 aperture broadly ovate ; peristome rather thin, continuous. 



Size : — 



Major diam. 7'5, minordiam.7'0, alt. axis 6*3, total height 8*7millims. 



[" On the limestone ridge to the S.W. of Gollonsir valley, only on 

 the top of the ridge and facing the south." (I. B. B.)] 



LiTHiDiON MARMOROSUM, u. sp. (Plate XXVIII. fig. 6.) 



Shell discoid, very solid, widely and openly umbilicated, sharply 

 keeled ; sculpture, strongly ribbed longitudinally with 5 sulcations 

 below and 4 above the peripheral sulcation, crossed by very fine 

 lateral regular striation ; colour marbly white ; spire flatly depressed, 

 apex papillate, polished ; suture shallow ; whorls .5, eccentrically 

 wound at the apex, the axis there not being perpendicular to the 

 planes of the last whorl (figs. 6 b and 6 c) ; aperture circular, oblique ; 

 peristome reflected, strongly developed on the columellar margin. 



Operculum shelly, concentric, of 3 whorls ; the margin reflected, 

 forming a raised spiral rib. 



Size. Major diam. lOv, minor diam. 9*2, alt. axis. 32 millims. 



Animal pale ash-grey ; tentacles black ; foot divided longitudi- 

 nally ; proboscis long, bilobed. 



