— 354 — 



quentes 4 y/2 tenuiter costulati, cœteri superne complanati, 

 striis incrementi et funiculis decurrentibus filifonnlbus subti- 

 liter decussati; anfr. ultimus ad pcripheriam rotmidatus, 

 inferne lœvis ac politiis, clrca umbilicuin obscure angulatus, 

 aperturam versus subdilatatus ac paululum descendens. Aper- 

 tura semilunaris, obliqua, marginibus callo debili, denticuhim 

 niinutum et elongatum prasbente, jiinctis. Peristoma album 

 incrassatum et rellexum. 



Laminse pariétales 5, postica incurvata, obliqua, antica 

 brevissima. Laminse palatales transmrsœ 6, prima debilis, 

 ceterœ semicirculares, funiculo verticali junctœ. 



Shell dextral, raoderalely umbilicated, discoid, dull 

 corneous, the nepionic wliorl smooth, the iiext 1 1/2 finely 

 ribbed, tiie remaining whoris finely striated, decussated 

 by fine raised thread-like spirals as far as the periphery, 



V\2. 4» 



Fis. 4» 



Fis. i^ 



Fig. 4>i 



Fig. 4« 



where the sculpture suddenly ceases and below which 

 the shell is smoolh and polislied. Spire depressed-couoid, 

 apex prominent, suture shallow. Whoris 7, increasing 

 regularly, flatlened above, rounded at the periphery and 

 below, obscurely angulated round the raoderate, deep, 

 open umbiiicus; last whorl slightly wideniug towards the 

 niouth, shortly descending in front. Aperture rotuudate- 

 lunate, oblique, margins convergent, united by a slight 

 siuuous callus on the pariétal wall with a small elongated 

 denticle near the edge. Peristome white, thickened and 

 reflexed, margins evenly rounded, the columellar scarcely 

 dilated and slightly impinging upon the umbiiicus. 



