LIT TRAM A angustata. 
TAB. CCCXXVII. 
Spec. Char. Transversely elongated, costated, 
gibbose, anteriorly rather compressed ; cos- 
tae oblique, numerous, acute. 
Costae about twelve; carina-formed; the surface is 
rendered rugged by rather deep irregular transverse 
striae, 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 earinas are as conspicuous 
within it as outside. 
From the cabinet of the Rev. John Ireland : found at 
Nunney, near Frome, in a calcarious gritstone : the 
shell still adheres to several parts of the specimen. 
