266 NEW FOSSIL SHELLS 
The peculiar lenticular form of this shell will at once distinguish it from all our other 
fossil species. ‘The only one, indeed, to which it bears any resemblance is the T. 
reclusus. From this it differs chiefly in size, umbilicus, and columella. 
T. rorquatus, Pi. 37. Fic. 84. 
L’. testd conicd, acuminatd, crassa, politd, perforata, crenulato-costatd; spird sub-conicd, depressiusculd, obtusd; suturia 
parvis; anfractibus quatuor, sub-convexis; costis transversis, quatuor, noduliferis; anfractu ultimo acute angulato, carinato; 
basi crebre et profunde striata; perforatione parvd; aperturd quadrangulari. 
Shell conical, acuminate, thick, polished, perforate, crenulately costate; spire somewhat conical, rather depressed ; 
obtuse; sutures small; whorls four, nearly flat; coste transverse, four, noduliferous; last whorl acutely angular, cari« 
nate ; base closely and profoundly striate; perforation small; mouth quadrangular. 
Length .13. Breadth .12 of an inch. 
Remarks.—The carina on the periphery of the last whorl is round and _ polished. 
There are three large, and one small nodulose coste, the small one being next to the one 
nearest the upper suture. 
This much resembles the T. armillus, herein described, but may be readily distin- 
guished from that shell by its umbilicus, more ovate shape, and more striate base. 
T. aratus, Pu. 37. Fic. 85. 
1’. test ovato-conicd, crassa, politd, imperforatd, costatd; spird depressd, sub-ovatd, obtusd, ad apicem levi; suturis parvis, 
linearibus; anfractibus tribus, sub-convexis; costis transversis, tribus, magnis, sub-noduliferis; anfractu ultimo angulato, 
costis quatuor ; basi sulcatd; aperturd rotunda. 
Shell ovately conical, thick, polished, imperforate, costate; spire depressed, sub-ovate, obtuse, smooth near the 
apex; sutures small, linear; whorls three, slightly convex; coste transverse, three, large, sub-noduliferous; last whorl 
angular, with four ribs; base suleate; mouth round. 
Length .08. Breadth .08 of an inch. 
Remarks.—In the only specimen of this shell now before me, the two upper ribs are a 
little nodulous, while the two lower ones are smooth. As this is a variable character, it 
is probable that they may all be nodulous in other specimens. The additional one on 
the last whorl is almost large enough to be called a carina. The base is closely and 
deeply grooved. ‘The mouth is perfectly round. 
This shell is somewhat similar to the 'T’. armillus, herein described, but is sufficiently 
distinguished by its more ovate form and round mouth. 
T. Rurrinu, Px. 37. Fic. 86. 
T.. testa conicd, crassa, costatd, imperforati; spird elevatd; suturis minimis, linearibus ; anfractibus 
et sulcalis, swperneé concavis et costatis; costis transversis, tribus, noduliferis, alternantibus striis minutissimis ; anfract ultimo 
angulato, bicarinato, carind superiore sub-crenulatd; basi levi; aperturd transversd, quadrilaterali; columella rotundatd, lined 
impressd marginata, 
» inferne carmalis 
Shell conical, thick, costate, imperforate; spire elevated; sutures very small, linear; whorls , carinate and 
suleate below, concave and costate above; coste three, transverse, noduliferous, alternating with very minute stria. 
last whorl angular, bicarinate; upper carina sub-crenulate; base smooth; mouth transverse, quadrilateral; columella 
rounded, margined by an impressed line. 
Length Breadth .38 of an inch. 
Remarks.—The edge of the last whorl has two carine, or perhaps, more strictly speak- 
ing, a large carina with a deep groove in its centre. On the superior whorls, the upper 
carina and groove are alone visible. The transverse strie are almost invisible to the 
