PLATE 137. 



jyr./}._The signification of the characters is the same in all the figures (compare p. 718). 



a. Northern polar spines. 

 6. Northern tropical spines. 



c. Equatorial spines. 



d. Southern tropical spines. 



e. Southern polar spines. 



DORATASPIDA. 



Diam. Page 

 Fig. 1. Phractaspis complanata, n. sp., 



Fig. 2. Phractaspis prototypus, n. sp., 

 Fig. 3. Phractaspis constrict'a, n. sp., . 

 Fig. 4. Pleuraspis horrida, n. sp., 

 Fig. 5. Stauraspis stauracantha, n. sp., 



Fig. 6. Stauraspis stauracantha, n. sp., 

 A single spine. 



Fig. 7. Echinaspis echinoides, n. sp., . 



Fig. 8. Echinaspis echinoides, n. sp., . 

 A single spine. 



Fig. 9. Coscinaspis parmipora, n. sp., . x 40 



