TO GEOLOGY. 215 



GENUS PUSUS. Lamarck. 



Fusus pumilus. Plate 6. Fig. 226. 



Description. Shell ovately fusiform, longitudinally rib- 

 bed ; substance of the shell thin ; spire rather obtuse ; 

 suture impressed ; whorls four, slightly convex ; columella 

 slightly twisted ; canal short ; mouth narrow. 

 Length .1, Breadth l-20th, of an inch. 



St Mary's, Maryland. John Finch. 



The smaller figure is of the size of nature. 



Observations. Three specimens of this very minute spe- 

 cies were found in the sand, taken from the cavity of a 

 larger shell. The description of the jP. minutus of Lam- 

 arck, from Grignon, seems to answer closely to our species, 

 but the latter has no transverse striae. 



GENUS MILIOLA. Lamarck. 



M. Marylandica. Plate 6. Fig. 227. 



Description. Shell elliptical, depressed in the middle, 

 rounded at the edges, lobes in contact ; mouth small, round, 

 terminal, furnished with a large tooth. 

 Length l-20th, Breadth nearly l-20th, of an inch. 



St Mary's, Maryland. John Finch. 

 The smaller figure is of the size of nature. 



