﻿288 CONRAD'S DESCRIPTIONS OF 



Locality. — Occurs with the preceding. Dr. Spillman. 



T. (Chemnitzia) laqueata. PL 46, fig. 36. Subfusiform ; spire conical-acute ; 

 whirls slightly convex, seven or eight in number ; ribs distant, subangular, inter- 

 rupted near the summit by a revolving impressed line, above which the penultimate 

 and body whirl are plicated ; aperture long, elliptical. 



Length of aperture 4 inch. 



Locality. — Occurs with the preceding. Dr. Spillman. 



T. (Chemnitzia) trigemmata. PI. 47, fig. 33. Turrited ; whirls seven, convex; 

 ribs distant, with three subequal tubercles; the ribs become obsolete towards the 

 suture, where there are two revolving lines, minutely beaded in a line with the ribs ; 

 suture profound, an impressed line revolving immediately above; base with six 

 revolving carinated lines. 



Length 1J inches. 



Accompanying the above are specimens of univalves, embracing the following 

 Eocene species : Mitra pactilis, C, Cancellaria gemmata, C, C. alveata, C, Galyptra- 

 phorus trinodiferus, C. All except the last are Claiborne species. 



TUDICLA, Bolton. 



Subgenus PYROPSIS, Conrad, 



Spire very short, apex not papilated ; labrum without striae within, thick ; 

 collumella without a fold. 



T. (Pyropsis) perlata. PL 46, fig. 39. Pyriform, tricarinated ; body whirl very 

 wide, profoundly carinated and spinous above ; the lower carina or rib less prominent 

 than the middle one ; revolving lines crenulated or subtuberculated, alternated on 

 the upper part of the body whirl ; aperture wide ; labrum margin crenulated. 



Locality. — Tippah Co., Mississippi. Dr. Spillman. 



This subgenus appears to be characteristic of the Cretaceous period, none having 

 been found in other formations. 



NEPJTINA, Lam.— NEMTELLA, Humph. 



Neritina densata. PL 46, fig. 37. Semiglobose, thick, solid; spire concealed; 

 labium callous, rounded, with an interior fold on the upper part. 



Locality. — Occurs with the preceding. 



This is the first species of Neritina yet discovered in America in afossil state. 

 It is about the size of Neritina squamifera, and retains a distinct trace of the colored 

 markings, which in form are not unlike those of the squamifera. Its habitat was no 

 doubt in brackish water of estuaries, like that of the only recent species of the United 

 States N. reclivata, Say. Both of them differ from typical species in having thick 



