PLATE 136. 



fl.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 et BELONASPIDA. 



I Miim. Page 



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



."'-I' 



Fig. 2. Icosaspis tdbulata, 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 haliommidium, 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. P/iatnaspis lacunaria, n. sp., . . . . . x 400 869 



