ALEXIA. 241 



Species of Plecotrema. 



bella, H. and A. Adams. inaequalis, C. B. Adams. 



clausa, H. and A. Adams. lirata, H. and A. Adams. 



concinua, H. and A. Adams. monilifera,ff. and A. Adams. 



Cubensis, Pfeiff. punctigera, H. and A. 

 decussata, H.andA. Adams. Adams. 



exarata, H. and A. Adams. punctostriata, H. and A. 

 imperforata, H. and A. Adams. 



Adams. typica, H. and A. Adams. 



Genus ALEXIA, Leach. 



Foot simple beneath, without a transverse groove. 



Shell oblong-ovate, imperforate, smooth ; spire acuminate ; 

 aperture elongate, oval ; inner lip 3 5 plaited, the posterior 

 plait small ; outer lip with the margin refiexed, thickened or 

 dentate internally. 



S//n. Phytia, Gray. Pythia, part, Beck, not Bolt. 

 Ovatilla, part, Bivon. Jaminea, part, Brown. 



Ex. A. denticulata, Montagu, pi. 82, fig. 5. Shell, A. 

 denticulata, fig. 5, a. 



The small shells comprising this group are chiefly Euro- 

 pean in their geographical distribution ; Bermuda and Peru, 

 however, furnish us with a few examples. 



Species of Alexia. 



acuta, D'Orb. microstoma, Kiist. 



Bermudensis, H. and A. myosotis, Drap. 



Adams. obsoleta, Pfeiff. 



Biasolettiana, Kiist. Payraudeaui, Shuttl. 



Botteriana, Pfeiff. personata, Mich. 



denticulata, Mont. reflexilabris, D'Orb. 

 Kutshigiana, Kiist. 



