114 NEW-YORK FAUNA — MOLLUSCA. 



GENUS PYRAMIS. Brown. 



Shell small, elongated, of numerous whorls. Aperture short, ovate, entire in front ; lip 

 sharp, disunited above ; pillar without a fold 



Pyramis striatula. 



PLATE VIII. FIG. 109. 



Pyramis striatula. Couthouv, Bost. Journ. Nat. Sciences, Vol. 2, p. 101, pi. 1, fig. 6. 

 p. id. Gould, Invertebrata of Mass. p. 269, fig. 174. 



Description. Shell small, smooth, subulate, imperforate, usually polished. Whorls seven 

 to nine, nearly flat, marked by twelve to fifteen minute regular revolving stria?, diminishing 

 in number to the apex : suture linear, and rather deeply impressed. Aperture ovate-acute, 

 angular above ; base very slightly effuse : outer lip sharp, smooth, without any sinus or groova 

 at its junction with the body-whorl ; pillar-lip arched regularly throughout. 



Color. Pale bluish white ; within milk-white. 



Length, 06. Basal diameter, 0-2. 



Stomachs of fishes, off the coast of Massachusetts. 



GENUS ODOSTOMIA. Fleming. 



Shell conical, elongated ; aperture ovate ; lips disunited above, and sometimes produced 

 beneath. Pillar with a tooth-like fold. Opercle horny, subspiral. 



Odostomia trifida. 



PLATE VIII. FIG. 170. 



(STATE COLLECTION.) 



Actceon trifidzts. Tottex, American Journal of Science, Vol. 26, p. 363. 

 Odostomia trifida. Gould, Invertebrata of Mass. p. 274, fig. 179. 



Descrip>tion. Shell small, elevated, pointed, smooth and glossy. Whorls eight, fiat, with abom 

 six impressed revolving lines ; the one above, and the two next below the suture, wider and 

 more distinct : ten or twelve very minute lines at the base of the body-whorl. Spire gradually 

 tapering to an acute apex. Aperture elongate, about one-third the length of the shell, acutely 

 angular above, produced and rounded below. Outer lip sharp and thin, entire ; pillar-lip with 

 a single sharp oblique fold : opercle horny. 

 Color. Ivory and soiled white. 

 Length, 0-2. Width, 0-08. 



