ACIIATINELLA. 139 



Cumingi, Newc. Pfei fieri, Newc. 



elongata, Newc. physa, Newc 



Helena, Newc. plicata, Migh. 



Sub-gen. leptachatina, Gould. 



Shell elongated, thin, translucent, shining; spire elevated, 

 obtuse; aperture narrow, one-third the length of the shell, 

 rounded in front, acute behind; columella without a conspicuous 

 fold bordering the truncation. 



accincta, Migh. grana, Neicc. 



acuminata, Gould. guttula, Gould. 



cingula, Migh. nitida, Newc. 



clara, Pfeiff. pyramis, Pfelff. 



corneola, Pfelff- vitrea, Newc. 

 fumosa, Newc. 



Sub-gen. labiella, Pfeiffer. 



Shell acuminately ovate ; apex obtuse ; inner lip callous ; 

 outer lip inflexed, thickened, with a callosity in the middle of the 

 inner margin 



dentata, Pfeiff. labiata, Newc. 



Sub-gen. auriculella, Pfeiffer. 



Shell sub- perforate, oblong-conic ; apertural paries furnished 

 with an intrant, spiral lamella; columella with the anterior plait 

 dentiform or obsolete ; peritreme a little expanded. 



auricula, Ferns. Petitiana, Pfeiff. 



cerea, Pfeiff. pusilla, Gould. 



