144 AMERICAN JOLRNAL 



VOLUTILITHES, Swainson. 

 Y. INDENTA, nob. 



Descripiion. — Subfusiform ; spire elevated ; volutions scala- 

 riform, and ridged below the suture, longitudinally costate ; 

 body whorl ribs acute ; revolving, attenuated striae from the 

 upper angle to the base ; area above the angle concave ; stria? 

 obsolete; columella with two equal, acute, oblique plaits. 



Length | inch. 



Y. IMPRESSA, nob. 



Description. — Fusiform; volutions seven, concave above, with 

 a revolving ridge at the suture : inferiorly ribbed ; ribs sub- 

 spinous at the angle ; body whorl with prominent, compressed 

 spines on the angle, capping the ribs; revolving lines im- 

 pressed ; columella with two slender prominent, nearly equal 

 plaits. 



Length 1\ inch. 



Locality. — Texas. 



OBELISCUS, Humphrey. 

 O. PEREXILIS, nob. 



Description — Subulate, polished; volutions fourteen ; sides 

 straight above and rounded at base ; suture deeply chan- 

 nelled; body whorl with slightly concave sides; columella 

 with a prominent plait uniting with the labial deposit. 



ARCHITECTONICA, Bolten. 

 ^^ CiELATURA, nob. — pi. 11, fig. 13. 



Description. — Depressed, with minute beaded, or tuberculatcd, 

 revolving lines, and a larger line near the base of each volu- 

 tion, and one near the suture above, smaller than the former, 

 but more distinct than the finer lines beneath; periphery 

 carinated ; base finely striated and tuberculatcd, w^th two dis- 

 tant larger lines ; submargin of umbilicus grooved ; umbilicus 

 small, edge crenate. 



Locality. — Claiborne, Alabama. 



BULIMUS. 



B. Floridanus, nob. — pi. 11, fig. 11. 



Enlarged figure of fossil described by me in the Amer. 

 Joiir. of Science, {Eulima Floridana, D'Orbigny.) The tertiary 

 limestone in which it was found, is supposed to be an Eocene 

 rock. 



