﻿290 CONRAD'S DESCRIPTIONS OF 



convex, excavated at suture ; whirls of spire have three revolving ribs, and the body 

 whirl, which is ventricose, about fourteen ; a fine line revolves between the ribs ; ribs 

 and lines elegantly crenulated by regular, closely arranged, fine lines ; body whirl 

 regularly rounded at base. 



Length li inches ; diameter t inch. 



Locality. — Eufaula, Alabama. Tuomey's collection. 



Another species, Tuba antiquata (Meleagris), Con., occurs in the Eocene. 



MOREA, Conrad. 



Short-elliptical ; aperture much longer than spire ; columella reflexed, concave, 

 with a prominent, acute fold at base. 



Morea cancellaria. PI. 46, fig. 30. Cancellated ; revolving furrows profound, 

 equal except on the shoulder; where the lines cross the ribs they form square 

 tubercles; ribs eight on the body whirl; spire short, conical; whirls four, lower 

 whirl tricostate ; base finely bicarinate, with transverse, curved lines ; umbilicus 

 channel angulato-concave, long and narrow ; aperture elliptical ; labrum margin 

 crenate or waved. 



Length 1 inch ; width f inch. 



Locality. — Eufaula, Alabama. Tuomey. Tippah Co., Mississippi. Dr. Spillman. 



A beautiful shell, with a widely reflexed labium and the tubercles showing through 

 the deposit on the upper part. 



THYLACUS, Conrad. 

 Ear-shaped, oblong, rounded ; aperture long, contracted above ; apex not spiral. 



Thylacus cretaceus. PI. 46, fig. 22. Oblong, contracted below the middle ; 

 apex prominent, terminal. - 



Locality. — Tippah Co., Altrb^nra. Dr. Spillman. 



PLACUNANOMIA, Broderip. 



Subgenus PARANOMIA, Conrad. 



Inequivalve, irregular ; larger valve radiate, spinous or subspinous ; lower valve 

 flat or concave ; hinge very thin and fragile, having a longitudinal flat shelly plate 

 extending from the apex ; hinge of upper valve plain, entire, extremely thin. 



I have often found fragments of this singular genus in the New Jersey Cretaceous 

 beds, but never saw the hinge before Mr. SafFord's specimens were received from 

 Tennessee. The muscular impression is not visible on any of the many valves I 

 have seen. 



Placunanomia Saffordi. PI. 46, fig. 21. Suborbicular or obtusely subovate, very 



