﻿PLATE LX. 



Concavum-zone. 



Sonninia acanthodes, 8. Buchman. 



Side view of the typical example of the species, showing the spines ending at 

 the beginning of the last whorl, and followed by reclining ribs more or less covered 

 with test. (The inner margin is drawn much too conspicuous in the last half- 

 whorl.) Bradford Abbas, Dorset. From my father's Collection. (Page 319.) 



(The plate is a copy of a photograph, and is within a fraction of natural size, 

 being 210 mm. [8j inches] as against 225 mm. [8f inches], the diameter of the 

 fossil.) 



