﻿PLATE LXIIL 



Concavum-zone. 



Sonninia acanthodes, 8. Buckman. 

 Fig. 1. — Front view of the specimen depicted in PL LX. (Page 319.) 



SONNINIA MARGIN ATA, 8. Buckman. 



Fig. 2. — Front view of the specimen depicted in PL LXII. (Page 321.) 



(The plate is a copy of an enlarged photograph, and is within a fraction of 

 the natural size, but the aperture of fig. 2 has been corrected, and the dotted 

 lines show the projection of the ribs.) 



