EXPLANATION OF PLATE 47. 



Cosmacanthus elegans n, sp. 



Fig. 1. — Lateral view of spine. (Natural size). 



Figs, la, lb, Ic. — Cross sections of spine taken at a, b, c, on figure 1, show- 

 ing form and extent of the medullary cavity. (Natural size). 



Fig. Id. — Posterior view of base of spine showing character of deep medul- 

 lary furrow. (Natural size). 



Fig. 2. — Top view of a tubercle showing typical form and sculpturing 

 (X 12.5). 



Fig. 2a. — Lateral view of the tubercle shown in figure 2. (X 12.5). 



