

PLATE 137. 









N.B. — The signification of the characters is the same in all the 



figures (compare p. 718). 







a. Northern polar spines. 



b. Northern tropical spines. 



c. Equatorial spines. 



d. Southern tropical spines. 



e. Southern polar spines. 









DORATASPIDA. 



Diam. 



Page 



Fig. 1. 



Phractaspis complanata, n. sp. 5 



. x 400 



809 



Fig. 2. 



Phractaspis prototypus, n. sp. 3 



. x 400 



809 



Fig. 3. 



Phractaspis constricfa, n. sp., . 



. x 400 



810 



Fig. 4. 



Pleuraspis horrida, n. sp., 



. x 400 



811 



Fig. 5. 



Stauraspis stauracantha, n. sp., 



. x 300 



832 



Fig. 6. 



Stauraspis stauracantha, n. sp., 

 A single spine. 



. x 600 



832 



Fig. 7. 



Echinaspis echinoides, n. sp., . 



. x 300 



833 



Fig. 8. 



Echinaspis echinoides, ii. sp., . 



A single spine. 



. x 800 



833 



Fig. 9. 



Coscinaspis parmipora, n. sp., 



. x 400 



827 



