PLATE 138. 



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. 



Fig. 1. 



Fig. 



2. 



Fig. 



3. 



Fig. 



4. 



Fig. 



5. 



Fig. 



6. 



Fig. 



7. 



Fig. 



8. 



Fig. 



9. 



Fig. 



10. 



Fig. 



11. 



DORATASPIDA. 



Coscinaspis peripora (vel Dorataspis peripora), n. sp., 

 Dorataspis fasiger a, n. sp., . 

 Dorataspis micropora, n. sp., 



Dorataspis typica, n. sp., .... 



Fig. 4a. Polar view of the central union of the twenty spines, 



Ceriaspis inermis, n. sp., . 



Ceriaspis favosa, n. sp., 



Hystrichaspis fruticata, n. sp., 



Hystrichapsis pectinata, n. sp., 



Hystrichaspis fur cata, n. sp., 



Hystrichaspis dorsata, n. sp., 



Hystrichaspis cristata (vel Siphonaspis cristata, n. sp.), 





Diam. 



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