52 MOLLUSCA FROM THE CRAG. 



shell, figured by Lea (Contributions to Geology, pi. 5, f . 155), but that shell does not 

 appear to be ornamented like our species. The cancellated exterior is scarcely 

 shown enough in the engraving. 



Fusus,* Lam. 1801. 



Fusus intortus (?). Lam. 



— S. Wood. Catalogue 1842. 



A worn and mutilated specimen of a shell which bears a great resemblance to 

 the above Eocene species. It has been for some years in my cabinet, and was 

 found by myself in the Red Crag of Sutton. It is possible that it may be a London 

 clay specimen washed out of that formation. 



Fusus poeeectus (?), Brander. 

 Fusus porrectus. S. Wood. Catalogue 1842. 

 Mukex porrectus. Brander. Foss. Hant. pi. 2, fig. 36. 



A mutilated specimen also of what appears to be the well-known Barton species. 

 It was found by myself in the Red Crag of Sutton, but it is not in a condition to be 

 fairly identified. This shell and F. intortus are deeply stained with the ferruginous 

 tinge of the Red Crag, and were probably both introduced into this formation from 

 the London clay. 



PiEUEOTOMA,t Lam. 1801. 



Turricula. Schum. 1817. 

 Tomella. Sw. 1840. 



Gen. Char. Shell fusiform and turriculate, often thick and strong, generally 

 sulcated or striated transversely ; rarely smooth, sometimes nodose or tuberculated, 

 with an ovate aperture, terminating inferiorly in a canal more or less elongated ; 

 outer lip sharp and thin, furnished with a slit or sinus below the suture ; columella 

 smooth, nearly straight, and in the recent state it has an acuminated operculum, 

 with the nucleus at the sharper and lower extremity. 



This genus comprises a large number of species, the greater part of which are 

 natives of tropical or subtropical regions. None in which the sinus is immediately 

 in the side have hitherto been found in a living state in a latitude so high as that 

 of the British Channel. To this character it is here intended to restrict the genus. 

 In the Eocene formations this genus is exceedingly abundant, both in species and 

 in individuals, as if the climatal conditions of the seas of that period were more 

 immediately favorable to its development. 



* Etym. Fusus, a spindle. 



f Etym. Il\eu|oa, the side, and Top), an incision, 



