24 



TEHEBRATULA aifinis. 

 TAB. CCCXXlV,—Fig, 2. 



SpEd. Char. Orbicular, strongly striated ; up- 

 per valve gibbose, with an elevated sinus 

 in the front, lower valve nearly flat. 



xliNGE line rather straight, almost equal to the width of 

 the shell in length : the sinus in the front is obtuse, 

 filled with a tongue-shaped elevation of the lower valve : 

 the striae are deep and very regular. 



The strong resenablance this bears to the recent Tere- 

 bratula dorsata of Lamarck, &c. (Anomia dorsata Auct.) 

 makes it at first sight to be taken for it, especially if 

 figures alone are consulted ; but the great inequality of 

 the valves is a sufficient distinction. 



The specimens are from near Horncastle, and appear 

 to be from decomposing Mountain Limestone ; they were 

 given to me by Mr. G. Weir. 



Smaller ones have also been sent me from the Malvern 

 Hills by Miss Molesworth, and from Dudley by Mr. 

 Ryan. 



