FROM THE TERTIARY OF VIRGINIA. 253 
‘Shell ovately elongate, acuminate, thin, sub-perforate, diaphanous, striate; spire ‘somewhat attertate, mamillate; 
‘sutures impressed, linear; whorls six, convex; stris transverse, minute; last whorl rounded; base striate; mouth 
elongately-quadrate, sub-effuse. 
Length .22. Breadth .10 of an inch. 
Remarks.—The striw are very small and only to be seen with the aid of a microscope. 
The shell is very thin.—so much so as to be somewhat translucent. The mouth is 
angular above and below. There is a slight angle on the superior part of the whorls, 
immediately below the upper suture. 
This pretty little shell has no decided resemblance to any of our fossil species. P. 
sulcata, Lea, approaches it more nearly than any other. 
P. TuRBINopsIs, Pu. 35. Fic. 50. 
P. testa ovato-conoided, sub-elevatd, tenui, levi, imperforatd; spird breviusculd, rotundatd, obtusa; suturis pro- 
Sfundis; anfractibus quatuor, convexis, propé suturam superiorem sub-canaliculatis; anfractu ultimo rotundato; basi 
levi; apertura magna, sub-rotundd. 
Shell ovately conoidal, somewhat elevated, thin, smooth, imperforate; spire rather short, rounded, obtuse; sutures 
deep; whorls four, convex, sub-canaliculate near the upper suture; last whorl rounded; base smooth; mouth large, 
sub-rotund. 
Length .10, Breadth .05 of an inch. 
Remarks.—The whorls have a small angle immediately at the wpper suture, which 
gives them somewhat the appearance of being channelled. The mouth is oblique, 
nearly round, and has the lower margin produced obliquely, below the inner lip. 
I have felt some doubts in placing this shell among the Pasithes, as it hardly has 
the effuse mouth of that genus, but its characters seem to agree better with it than with 
any other. 
This little shell resembles some of our recent species of Amnicola;—it also approaches 
the Turbo minutus, Totten (Cingula minuta, Gould,) but it is more globose and differs 
in size. 
P. oRNATA. 
P, testd ovato-subulatd, crassd, sub-perforatd, costatd, striata; spird elevatd, mamillatd, prope apicem levi; suiuris 
linearibus; anfractibus quinque, valde convexis; costis transversalibus, latis, politis; striis longitudinalibus, minus 
lissimis; anfractu ultimo rotundato; basi costulatd; perforatione pene obsoletd; aperturd ovata, effusd, 
Shell ovately subulate, thick, sub-perforate, costate, striate; spire elevated, mamillate, smooth near the apex; su- 
tures linear; whorls five, very convex; coste transverse, wide, polished; striz longitudinal, very minute; last whorl 
rounded; base costulate; perforation almost obsolete; mouth ovate, effuse. 
Length Breadth ——— 
Remarks.—On the upper whorls the coste are five in number, on the last one they are 
much more numerous. ‘Those on the base are smaller and closer together. Near the 
lower sutures, on the whorl next the last, is a rib larger than the rest, with*an impressed 
line in its centre, making a kind of double rib. It may be traced round the middle of 
the last whorl. As I have but one specimen before me, I cannot decide whether this is 
@ general character or not. ‘The longitudinal strie are only to be seen in the intervals 
of the ribs. They are very small and sometimes disappear.* 
T unfortunately lost my only specimen of this shell after describing, but before measuring or making a drawing 
ys - am, therefore, unable to give either the dimensions or a figure. It was, however, not more than a quarter 
of an inch in length, at the utmost, 
VOL. IX.—67 
