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 
PyRAaMIS STRIATULA. 
PLATE VIII. FIG. 169. 
Pyramis striatula, CourHovy, Bost. Journ. Nat. Sciences, Vol. 2, p. 101, pl. 1, fig. 6. 
Da id. Gov p, 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 strie, 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 groove 
at its junction with the body-whorl ; pillar-lip arched regularly throughout. 
Color. Pale bluish white ; within milk-white. 
Length, 0:6. 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. 
OposToMIA TRIFIDA. 
PLATE VIII. FIG. 170. 
(STATE COLLECTION.) 
Acteon trifidus. TorreN, American Journal of Science, Vol. 26, p.368. 
Odostomia trifida. GouLpD, Invertebrata of Mass, p. 274, fig. 179. 
Description. Shell small, elevated, pointed, smooth and glossy. Whorls eight, flat, with about 
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. 
