138 CONTRIBUTIONS 



Observations. This species is more completely covered 

 with striae than any other here described. On the superior 

 part of the shell very minute folds may in some specimens 

 be observed. 



This beautiful genus exists in great numbers in a fossil 

 state in the superior beds, but has not, I believe, either in 

 this country or in Europe, been observed below the Ter- 

 tiary. Sowerby describes eleven from the London Clay, 

 it being found in England only in that formation. M. 

 Deshayes mentions one hundred and fifty-six as existing 

 in the Tertiary of Europe. Forty-one are from the Paris 

 basin and thirty-three from the Subappennines. In this 

 country Mr Conrad is, I believe, the only geologist who 

 has noticed the genus. At St Mary's, Maryland, he dis- 

 covered seven species, which are described by him in the 

 Journal of the Academy of Natural Sciences, vol. 6, p. 223. 

 Neither of these is the analogue of those above described. 



GENUS CANCELLARIA. Lamarck. 



C. babylonica. Plate 5. Fig. 134. 



Description. Shell turrited, inflated, smooth, substance 

 of the shell thin ; whorls six, angular, broad and flat at the 

 top, and furnished on the angle with irregular erect spinous 

 tubes ; umbilicus wide, armed with points ; mouth trian- 

 gular, two fifths of the length of the shell ; columella with 

 two indistinct folds ; outer lip sharp. 

 Length .5, Breadth .3, of an inch. 



