﻿334 CONRAD'S DESCRIPTIONS OF 



NATICA, Lam. 



Subgenus LUNATIA, Gray. 



•N. Lunatia kectilabrum. PL 35, fig. 28. Subglobose; spire conical, subscalariform ; 

 labrum straight in the middle ; umbilicus moderate in diameter, profound. 



The specimen figured is to the eye as perfect as when first entombed in the 

 Cretaceous ocean's bed. 



SOLIDULUS, Fischer. 



Solidulus linteus. PL 35, fig. 10. Elliptical, with very numerous close 

 revolving lines, most distinct on the inferior half; interstices regularly and elegantly 

 striated transversely. 



A beautiful species, but the specimen much distorted, which I have endeavored in 

 the figure to restore to something of its original shape. 

 The above genus is identical with Action, Montfort, and Tornatella, Lam. 



BULLOPSIS, Conrad. 



Subglobose ; spire depressed ; aperture wide ; columella biplicate. 

 The spire in this shell is sunk like that of Bulla. I have seen no other shell 

 resembling this. 



Bullopsis cretacea. Sculpture resembling that of Solidulus, consisting of 

 minute impressed lines ; aperture wide in the middle ; plaits prominent. 

 Length i inch ; width i inch. 



■ CEPHALOPODA. 

 BACULITES, Lam. 



Baculites tippaensis. PL 35, fig. 27. Acutely ovate, smooth, with profoundly 

 sinuous lines of growth, which rise on the sides, and curve downwards on the back 

 and front ; shell splendidly iridescent ; back regularly rounded ; front slightly con- 

 tracted, or with depressed lines on the sub-margin. 



This species can be readily distinguished from B. ovata, Say, by its acutely ovate 

 outline viewed in a tranverse section. The substance of the shell appears to be 

 in perfect preservation, beautifully iridescent, and the lines of growth run profoundly 

 oblique downwards to the front, which they cross in nearly straight lines. Specimens 

 show the interior free from sand, with the foliated septa as perfect as when the 

 animal inhabitant was alive. In most specimens the front is obtusely carinated as 

 in the following species : 



