104 



nearly straight edged, except a small rounded sinus near 

 its junction with the body of the shell, below this sinus 

 there is internally a slight protuberance, the aperture is 

 oblong, equally obtuse at each end. 



In general form this so much resembles B. juncius, 

 that one is induced to place them in the same Genus, 

 although there is a sinus in the lip of this ; but in other 

 respects and in the straight form of the lip it differs from 

 Pleurotoraa, to which it might perhaps otherways be re- 

 fer ed. 



A pretty Crag fossil picked up by my communicative 

 Friend, the Rev. G. R. Leathes. 



