154 CONTRIBUTIONS 



More recently the same author has described six new 

 species from the Tertiary of Maryland and Virginia.* 



GENUS PYRULA. Lamarck. 



P. cancellata. Plate 5. Fig. 160. 



Description. Shell subpyriform, beautifully cancellate 

 over the whole exterior ; substance of the shell thick ; 

 spire rather elevated, pointed ; suture small, slightly 

 thickened above ; whorls six, angular above ; canal rather 

 short and wide ; mouth subovate, rather contracted ; outer 

 lip thickened, with the edge bevelled. 



Length 1.4, Breadth .7, of an inch. 



Observations. Unfortunately but a single specimen of 

 this truly beautiful shell has come into my possession. 

 It is perfect and presents very remarkable decussating 

 striae, which are so regularly placed as to present the ap- 

 pearance of meshes, the point of section being enlarged. 

 This enlargement causes the angle of the whorls to be 

 somewhat granulate. It seems from Sowerby's figuref 

 to resemble pretty closely the Pyrula nexilis\ (Lamarck), 

 (Murex nexilis of Brander). The spire is, however, more 

 elevated, the canal shorter and the superior part of the 

 whorl angular. The Pyrula Greenwoodii, figured by Sow- 

 erby, plate 498, has some characters resembling our species, 

 but is specifically different. 



* Fossil Shells of Ter. For., p. 17 t Min. Conch, pi. 331. 

 t Ani. Sans. Ver. vol. 7, p. 572. Hamp. Fos. p. 4, fig. 55. 



