168 OBSERVATIONS ON THE CHAROPIDJE, 



Shell thin, globose, slightly gibbous, very narrowly perforated. 

 Colour brown, some specimens darker than others ; the last whorl 

 apparently darker than its predecessors. Whorls 51 slowly 

 increasing, the penultimate wider than the final when seen from 

 above, channelled at the suture, tumid beneath it ; last whorl 

 gradually and slightly ascending at the aperture, rounded at 

 the periphery and on the base. Sculpture everywhere closely 

 ornamented by microscopic transverse raided hair-lines, whose 

 interstices are latticed by smaller spiral lines ; upon the base 

 there are distinguishable some thirty faint and irregularly spaced 

 costge, but this primat-y sculpture is obsolete above. Embryonic 

 shell of ^ whorls, plane and nearly smooth, clearly marked off 

 from the adult. Umbilicus very narrow, abrupt at the margin, 

 half covered by a tongue of callus. Aperture crescentic, perpen- 

 dicular, peristome thin, straight, projecting little at the periphery. 

 Callus especially prominent and heavy, curving obliquely acioss 

 the whorl. Diam. maj. 2J, min. 2^, alt. 2 mm. 



Type in the collection of C. E. Beddome. Es-q., R.N. 



Hab. — Mt. Bischoff, Tasmania (Beddome); occurred under 



timber. 



C. GADENSis, Beddome (1879). 



(Plate II. tigs. 1, 2, 3, 4.) 



Descr°- — Monograph of the Land Shells of Tasmania, p. 29 ; 

 Proc. Roy. Soc. of Tasmania, 1879, p. 23. 



Shell thin, transparent; contour discoidal, spire plane. Colour 

 hyaline-amber, unicolorous. Whorls 3-1, rather rapidly increasing, 

 deeply channelled at the suture, rounded on their summits and at- 

 the periphery, flattened somewhat on the base. Sculpture : 

 embryonic whorls, comprising the fir.st 1^ revolutions, delicately 

 sculptured by faint transverse capillary costse, the adult whoris 

 are ornamented by fine capillary costte, of wliich the last whorl 

 bears about 175. These are directed straight across the whorl, 

 and are everywhere crossed \>y very minute raised hair-lines, 

 which within the umbilicus grow coarser and dominate the 

 transverse lines. Umbilicus about a third of the diameter of 



