PLATE 140. 



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

 a. Northern polar spines. 

 if s 



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. 



Fig. 



12. 



Fig. 



13. 



Fig. 



14. 



Fig. 



15. 



Belonaspida, Hexalaspida et Diploconida. 



loconus amalla, n. sp., 



Diploconus hexaphyllus, n. sp. 



Diploconus cyathiscus, n. .sp., 



Diploconus cotyliscus, n. sp., 

 Polar view. 



Diplocolpus serratus, n. sp., 



Diplocolpus cristatus, n. sp., 



Diplocolpus costatus, n. sp., 



Diplocolpus sulcatus, n. sp., 



Diplocolpus dentatus, n. sp., , 



Meridional section through the centre of the shell. 



Hexacolpus infundibulum, n. sp., 



Hexacolpus trypanon, n. sp., 



Hexaconus echinatus, n. sp., . 



Coleaspis vaginata, n. sp., 



Meridional section through the shell. 



Coleaspis hydrotomica, n. sp., 



Hexonaspis hexapleura, n. sp., 



A single spine with its thick apophyses. 



Fig. 16. Hexonaspis hastata, n. sp., 



Diam. Page 



x 300 885 



x 300 886 



x 300 885 



x 400 886 



x 300 888 



x 400 887 



x 400 887 



x 300 888 



x 300 888 



x 300 881 



x 300 881 



x 300 878 



x 300 866 



x 400 867 



x 400 879 



x 400 



879 



