268 [February, 



direct, or sloping inwards; inner margin crenulated ; lunule large, ovate, acute, 

 deeply excavated. 

 Locality. Near Mullica Hill. Prof. Thomas. 



TURRITELLA. 



T. secta. Turrited ; volutions flattened or plano-convex at the sides, with 

 minute obsolete revolving lines, a few of which are larger than the others and 

 remote; whorls subcarinated near the base and profoundly excavated beneath 

 towards the suture. 



Locality Occurs with the preceding. Prof. Thomas. 



Descriptions of one Tertiary and eight New Cretaceous Fossils from Texas, in 



the Collection of Major Emory* 



By T. A. Conrad. 

 ROSTELLITES, Conrad. 



Univalve, elongated, with an expanded labium, and having numerous oblique 

 plaits on the columella. 



This genus is related to Apoorhais, but differs in having a plaited columella. 

 The entire shell or cast has never been obtained, and the outline cannot be 

 determined. 



Rostellites Texanus. Narrow, elongated, with a subulate spire; plaits 

 oblique, narrow, acute, largest above, and becoming obsolete towards the base; 

 whorls of the spire flattened on the sides. 



Locality. Eagle Pass. 



The description was made from a cast, with only traces of the shell remaining, 

 the substance of which appears to have been thick, A large portion of the flat- 

 tened columella remains. The cast is associated with Cardium congest um. 



TURRITELLA, Lam. 



Turritella irrorata. Slightly turrited, subulate, elongated ; whorls with four 

 to rive fine revolving unequal beaded lines on each, and an intermediate smooth 

 minute line. 



Locality. Between El Paso and Frontera ? 



This shell differs from T. seriatim-granulata, Roemer, in having much finer 

 lines and tubercles, and in having a smooth line between each of the beaded 

 ones. It is associated with Nodosaria occidentalism the very small Venus quiit- 

 quecosta, and the little Corbula occidentalis. It is imbedded in a highly fossil- 

 iferous, ferruginous, indurated clay, which appears to have been obtained from 

 the same bed with Cardium Texamtm. 



CAPRINA. 



1. Caprina planata. A fragment of one valve two feet or more in length, 

 and another smaller fragment represented in the figure. Flattened on one side 

 and convex on the other, a much compressed outline; the shell is very long and 

 narrow, falcate, fibrous, and distinctly exhibiting the small septa as they occur 

 in the genus Caprina. The cavities between the septa are lined with crystals 

 of carbonate of lime, and the shell is imbedded in white friable limestone 

 resembling chalk marl. 



Locality. Oak Creek, near Puercos. 



2. C. occidentalis. Falcate; flattened on the side of the outer curve, convex 

 on the opposite ; the other margins acutely rounded ; surface very obscurely 

 striated transversely; substance coarsely fibrous. 



Locality. Near the mouth of Puercos River, Texas. A. Schott. 

 The matrix of this shell resembles chalk marl. 



