102 CONTRIBUTIONS 



The smaller figure is of the size of nature. 



Observations. This minute species resembles P. notata 

 above described, but has not the marks of growth. It is a 

 smaller species, and the whorls are not quite so flat. 



P. aciculata. Plate 4. Fig. 82. 



Description. Shell acicular, highly polished ; substance 

 of the shell thin ; apex very acute ; suture linear, very mi 

 nute ; whorls nine, flattened ; mouth elongate, acutely an 

 gular above obtusely angular below, about one fourth the 

 length of the shell ; columella slightly thickened ; outer 

 lip edged. 



Length 3-20ths, Breadth l-20th, of an inch. 



The smaller figure is of the size of nature. 



Observations. This is the most attenuate of the genus, 

 so far as my observations have extended, and is an interest 

 ing minute species, remarkable for its high polish and 

 delicate form. 



P. striata. Plate 4. Fig. 83. 



Description. Shell conical, transversely striate ; sub 

 stance of the shell thin ; apex rather acute ; suture im 

 pressed; whorls eight, rounded; mouth subovate, about one 

 fourth the length of the shell ; columela flattened at the 

 base. 



Length 4-20ths, Breadth nearly .1, of an inch. 



The smaller figure is of the size of nature. 



