PLATE 136. 



N.B. — The signification of the characters is the same in all the figures (compare p> 718). 



a. Northern polar spines. 



5. Northern tropical spines. 



c. Equatorial spines. 



d. Southern tropical spines. 



e. Southern polar spines. 



Doeataspida et Belonaspida. 



Diam. Page 



Fig. 1. Tessaraspis arachnoides, n. sp., . . . x 300 836 



Fig. 2. Icosaspis tabulata, n. sp., [ . . . x 200 843 



Fig. 3. Icosaspis icosastaura, n. sp., . . . . x 400 846 



Fig. 4. Icosaspis elegans. n. sp., . . . . . x 300 844 



Fig. 5. Tessaraspis concreta, n. sp., . . . . x 400 838 



Fig. 6. Phatnaspis cristata, n. sp., . . . . . x 400 869 



Fig. 7. Phatnaspis haliommidiuw^ n. sp., . . x 200 871 

 Central capsule within the shell — outline. 



Fig. 8. Coscinaspis polypora, n. sp., . . . . . x 300 827 

 A single lattice-plate of the shell. 



Fig. 9. Phatnaspis lacunaria, n. sp., . . . . . x 400 869 



