29 



LUTRARIA angustala. 



TAB. CCCXXVIJ. 



Spec. Char. Transversely elongated, costated, 

 gibljose, anteriorly rather compressed ; cos- 

 tae obliqne, noiiierous, acmte. 



CosTi; about twelve; cariaa-fonned ; the surface is 

 reiulered rugged by rather deep irregular transverse 

 striic, and intermediate ridges : it does not appear that 

 either side is gaping ; the posterior one is rounded, and 

 extends a very little way from the beaks : the substance 

 of the shell is thin, so that the carinse are as conspicuous 

 within it as outside. 



From the cabinet of the Rev. John Ireland : found at 

 Nuaney, near Frome, in a calcaneus gritstone : the 

 shell still adheres to several parts of the specimen. 



