40 



TEKEBEATULA? imbricata. 

 TAB. CCCXXXlV.—Figs. ^andi. 



Spec. Char. Transversely oval, gibbose, im- 

 bricated ; longitudinally sulcated ; front 

 slightly elevated ; sulci obsolete. 

 I^ATHER longer than the last ; the surface is composed 

 of about 12 sulcated laminae lying close upon each other, 

 with remote edges ; the beaks are prominent incurved ; 

 the hinge line short, and the front very slightly sinuated. 

 Fi"". 3 is taken from a Derbyshire Limestone specimen, 

 and fig. 4 from one found at Settle in Yorkshire. This 

 species has probably been confounded with the pre- 

 ceding by Martin. 



