8 Bryant Walker 



Subgenus BULIMNEA Haldeman, 1841. 



Shell large and solid, bulimiform, with an imper- 

 vious axis, a twisted or subplicate pillar, the callus on 

 the body-whorl and pillar closely appressed and the 

 outer lip not thickened or expanded. 



"Prostate very large, irregularly elongate-ovate; 

 penis very large, one-fourth longer than penis-sac, 

 gradually enlarging in diameter toward the distal end ; 

 lateral teeth tricuspid." 

 Type : L. megasoma Say, fig. 8. Radula, fig. 9. 



Fig. 9 



Subgenus ACELLA Haldeman, 1841. 



Shell thin, smooth, acute, extremely slender ; aperture expanded 

 at the margin ; the inner lip not appressed, a moderate chink behind 

 it ; axis gyrate, pervious, not plicate ; outer lip simple, sharp. 



"Prostate large, flatly cylindrical; penis thick, about four-sev- 

 enths the length of penis-sac; lateral teeth bicuspid; the mesocone 

 with a distinct entoconic swelling." 

 Type: L. haldemani "Desh." W. G. Binn., fig. 10. Radula, fig. 11. 



Fig. 10 



Fig. II 



Subgenus GAFBA Schrank, 1803. 



Shell small, turreted; spiral sculpture wanting or subobsolete; 

 columella smooth; inner lip flatly reflected over the umbilicus. 



"Prostate long-ovate; penis a trifle shorter than penis-sac, of 

 narrow diameter; lateral teeth bicuspid." 

 Type: L. truncatula Miill. 

 Example: L. caperata Say, fig. 12. Radula, fig. 13. 



Fig- 13 



Fig. 12 



