148 CONTRIBUTIONS 



described, but may be distinguished by its larger folds and 

 the transverse striae, which, though numerous over the 

 whole shell, are not so closely set. In some specimens 

 on the folds there is a slight imbricate appearance. 



F. Delabechii* Plate 5. Fig. 151. 



Description. Shell subfusiform, furnished with rather 

 sharp longitudinal folds cut by imbricate transverse striae ; 

 substance of the shell thick ; spire somewhat elevated, acute 

 at apex ; whorls seven, subangular ; canal short, flexed ; 

 mouth subangular ; outer lip crenate, within striate. 



Length 13-20ths, Breadth .3, of an inch. 



Observations. This species in many of its characters 

 resembles the two last described. It may be known, 

 however, by its imbricate stria3 and obtuse angle on the 

 superior part of the whorl where the folds are somewhat 

 pointed. A single perfect and mature specimen only has 

 been observed by me. 



F. ornatus. Plate 5. Fig. 152. 



Description. Shell fusiform, furnished with rather 

 oblique folds on the middle of the whorls, transversely, 

 very minutely and alternately striate ; substance of the 

 shell thin ; spire rather elevated, pointed ; whorls seven, 

 subangular ; canal rather short, obliquely curved ; mouth 

 subangular ; outer lip sharp. 

 Length .6, Breadth 5-20ths, of an inch. 



* Named after the distinguished author of the " Geological Manual," 

 " Tabular View," &c., De la Beche. 



