Descriptions of New Fluvialile Shells. 99 



17. Ulelania incrassata. 



Plate II. Fig. 17. 



T. conica, glabra, crassa ; spira elevata ; anfr. 8-9, perconvexis, vix 

 biangulatis, ultimo spivaliter striato, in medio constricto ; sutuvis valde 

 impressis ; apertura ovata, intus rubescente ; columella reflexa, in sinum 

 profundum producta. 



Shell conical, smooth, thick; spire elevated; whorls 8-9, 

 very convex, somewhat bi-angulated ; sutures deeply impressed; 

 body whorl striated, with a constriction about the middle, which 

 also extends to the penultimate whorl ; aperture ovate, within 

 reddish ; columella not indented, reflected, sinus deep. 



Length 1.12 inch (29 millim.). Diam. 0.45 inch (12 millim.). 

 ' Length of aperture 0.37 inch (9 millim.). 



Breadth of do. 0.18 inch (44 millim.). , 



Habitat. . 



My cabinet. 



0fo._Only one specimen has come under my notice, which, 

 however, is so unlike any other that I cannot hesitate to con- 

 sider it new. 



It is a thick, ponderous species, with narrow, convex or bi- 

 angulated whorls, faintly banded on the angulations. 



18. Ulelania excavata. 



Plate II. Fig. 18. 



T. ovato-conica, glabra, crassa, castanea ; spira obtuse elevata, decol- 

 late ; anfr. superst. 3-4, planis vel subconcavis, ultimo in medio suban- 

 gulato, supra angulum subexcavato, striis incrementi rudibus ; suturis 

 distinctis; apertura ovata, sursum subcanaliculata, intus rubescente; 

 columella incurva, reflexa, sinum non formante. 



