168 CONTRIBUTIONS 



FAMILY COLUMELLARIA. 



GENUS MITRA. Lamarck. 



M. lineata. Plate 5. Fig. 174. 



Description. Shell subfusiform, longitudinally and in- 

 distinctly ribbed, furnished with a small transverse line 

 below the suture ; substance of the shell thin ; spire some- 

 what elevated ; suture small ; whorls , flattened ; 



mouth narrow ; columella with four folds^ outer lip 

 sharp ; within striate. 



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



Observations. A single specimen only of this species, 

 and that with the spire fractured, has been examined by me. 

 The folds are placed towards the base, which causes it to 

 look somewhat like a Pyramidella. The figure of Mr 

 Murchison's M. cancellata from Gosau, has some resem- 

 blance to our shell.* 



M. minima. Plate 6. Fig. 175. 



Description. Shell fusiform, smooth ; substance of the 

 shell thin; spire somewhat elevated, rounded at the apex ; 



* Geol. Soc. Trans, vol. 3, pi. 39, fig. 30. 



