252 NEW FOSSIL SHELLS 
Shell subulate, elongated, thin, polished, sub-perforate, costate, striate; spire attenuate, mamillate, conical; sutures 
linear, impressed; whorls twelve, slightly convex; ribs longitudinal, large, flat, smooth; striae transverse, near the 
upper suture smal] and numerous, near the lower suture large and unfrequent; last whorl rounded; base striate; per- 
foration almost obsolete; mouth ovate. 
Length .41. Breadth .10 of an inch. 
Remarks.—-The transverse strie do not cross the ribs, which are perfectly smooth and 
polished. ‘The whorls are divided about the middle by a deep impressed line. Above 
it is a series of close, small striz; below it the stri# are larger and more distant. On the 
body whorl they end at a rather deeper line about the middle. Here also the ribs end, 
and there is a smooth space before the strie of the base commence. ‘These are rather 
large and not numerous. The mouth is acutely angular above and rounded below. 
The outer lip is sharp. 
This elegant little shell is remarkable for its ivory-like appearance. The peculiar 
arrangement of its transverse strie distinguishes it from all other species. 
Peumvicsats,-Picss, Ere: 47 
P* testa elevato-conicd, acuminatd, imperforatd, crassd, levi, eburned, nitente; spird attenuatd, conicd, acutd; su- 
iuris linearibus, minimis; anfractibus » planis; anfractu ultimo sub-angulato; basi levi; apertura oblique quad- 
rilaterali, superne et inferné acute angulatd, effusd. 
Shell elevated-conical, acuminate, imperforate, thick, smooth, ivory-like, shining; spire attenuate, conical, acute; 
sutures linear, very small, whorls flat; Jast whorl somewhat angular; base smooth; aperture obliquely quadri- 
lateral, acutely angular above and below; effuse. 
Length .08. Breadth .10 of an inch. 
Remarks.—The whorls are perfectly flat, so that the outlines of the spire are straight. 
The surface of the shell is remarkably smooth and shining. 
In my largest specimen the lower whorls have been broken off, so that I am unable to 
give their number. ‘This fragment, however, has about eleven. 
This shell bears some resemblance to the P. aciculata, Lea, from Claiborne, but it 
may readily be distinguished by its larger size, less attenuate shape, and flatter whorls. 
P. ovutum, Pu. 35. Fie. 48. 
P, testé ovaid, sub-elongata, tenui, ‘mperforatd, levi, nitente; spird breviusculd, ovatd, obtusd; suturis profundis, 
linearibus; anfractibus quatuor, conveais; anfractu ultimo rotundato; basi levi; aperturd ovata; columelld crassi, lata; 
levi. 
Shell ovate, somewhat elongate, thin, imperforate, smooth, shining; spire rather short, ovate, obtuse; sutures deep, 
linear; whorls four, convex; last whorl rounded; base smooth; mouth ovate; columella thick, wide, smooth. 
Length .15. Breadth .08 of an inch. 
Remarks.—The mouth is angular above and rounded below. The sutures are deep, 
owing to a slight conical depression of the whorls immediately at their junction with 
those above. 
I know no species to which the above is allied. 
P. DIAPHANA, PL, 35. Fic. 49. 
P. test ovato-elongatd, acuminata, tenui, sub-perforatd, diaphand, striata; spird subattenuatd, mamillatd; suturis 
impressis, linearibus; anfractibus sex, convexis; striis minutis, transversalibus; anfractu ultimo rotundato; basi 
striatd; aperturd elongato-quadratd, sub-effusd, 
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