PLATE XX. 



Fio-. 1 a. Dithyrocaris granulata, W. & E. Carapace flattened, open. X 2-g. 



B. M., 59541, No. 9 ; also PI. XVIII, fig. C. (Page 144.) 



Fig. \ i, —The same. Two cephalic and one nuchal ridge. X 5. 



Fi g . 2 a.—D. granulata, W. & B. Left valve. X 2\. M. G. S. Sc, F ^, 

 No. 6 ; also PI. XVIII, fig. 4. (Page 142.) 



Fig. 2 b.— The same. Part of surface, including the dorsal ridge. X 14. 



Fio-. 2 c. — The same. Outline of the ridge. X 14. 



ID 



Fig. 2 d. — The same. Part of the surface. X 40. 



Fig. 3 a.—D. granulata, W. & E. Carapace, somewhat crushed. X 2\. B. M., 

 59541? No. 10 ; also PI. XIX, fig. 6. (Page 144.) 



Fig. 3 b.— The same. Outline of the elevation of the carapace. X 2|. 



Fig. 3 c. — The same. One of the cephalic ridges. X 5. 



Fio-. 3 d.— The same. View of the broken end of the dorsal ridge. X 10. 



Fig. 3 e. — The same. Part of the surface. X 40. 



Fig. 3/._ The same. Outline of the elevation of the dorsal ridge. X 15. 



Fig. 3 <j.— The same. Part of the dorsal ridge. X 15. 



