

NORTH-CAROLINA GEOLOGICAL SURVEY. 

 FIG. 225. 



297 



FIG. 225A. 



TELLINA LTJSORIA. (Fig. 225A.) 



Shell oblong, narrowed posteriorly, slightly gaping or re- 

 flected; pallial sinus deep; 

 concentrically striate ; pos- 

 terior margin marked with 

 one or two folds; surface 

 still brown ; concentric striae 

 are in the form of raised 

 sharp lines, not impressed 

 lines of growth. The Tipho- 

 nal inflection is in contact with the pallial line, in which re- 

 spect it agrees with P. Sammobia, but its hinge teeth are 

 2 2 in both valves. 



GENUS DONAX. 



"The general form is trigonal, or wedge form, valves closed, 

 front produced, posterior short ; margins usually crenulated ; 

 hinge teeth 22 ; laterals 11 in each valve ; pallial sinus 

 deep." 



