PLATE 134. 



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. Dodecaspis tricincta, n. sp., . . . . . x 400 834 



The enclosed central capsule contains numerous spherical nuclei 



Fig. 2. Lychnaspis minima, n. sp., . . . . x 400 841 



Six-sided basal pyramid of an equatorial spine, with the leaf-cross, seen 

 from the centre. 



Fig. 3. Zonaspis cingulata, n. sp., . . . . . x 400 834 



Equatorial section through the central capsule, n, nuclei; g, yellow 

 bodies (intracapsular xanthellae). 



Fig. 4. Zonaspis cingulata, n. sp., . . . x 800 834 



Central pyramidal base of an equatorial spine, with the leaf-cross. 



Fig. 5. Stauraspis cniciata, n. sp., . . . . x 400 831 



Central union of the radial spines, three polar spines being taken off. 



Fig. 6. I/ychnaspis longissima, n. sp., . . . . x 400 841 



Fig. 7. Lychnaspis minima, n. sp., . . . . . x 400 841 



' Five-sided basal pyramid of a tropical spine, with the leaf-cross, seen from 

 the centre. 



Fig. 8. Lychnaspis minima, n. sp., . . . . . x 400 841 



Six-sided basal pyramid of a polar spine, with the leaf-cross, seen from 

 the centre. 



Fig. 9. Icosaspis elegans, n. sp., . . . . x 400 844 



An Isolated polar plate. 



Fig. 10 Icosaspis cruciata, n. sp., . . . . . x 400 844 



An isolated equatorial plate. 



Figs. 11, 12. Dorataspis species, . . . . . x 100 



Diagram of the composition of the shell of twenty plates (and also of the 



central union of the basal leaf-cross). 

 Fig. 11. Oblique equatorial aspect. 

 Fig. 12. Accurate polar aspect (compare p. 804, 805). 



Fig. 13. Coscinaspis isopora, n. sp., . . . . . x 400 828 



An isolated equatorial plate (with two aspinal and six coronal pores). 



Fig. 14. Coscinaspis isopora, n. sp., . . . . . x 400 828 



Two isolated tropical plates (6, northern ; d, southern), each with two 

 aspinal and five coronal pores). 



Fig. 15. Diporaspis nephropora, n. sp., . . . x 400 816 



Fig. 16. Acontaspis hastata, n. sp., . . . . x 400 829 



