PLATE XIX. 



(All the figures of the natural size except Fig. 6 b.) 



Fig. 1. — Dithyrocaris glabra, H. Woodward and R. Btheridge, jun. Left 

 valve. Brit. Mus., 59541, No. 1. (Page 138.) 



Fig. 2. — D. glabra, W. & E. Two displaced and partly overlapping valves. 

 Mus. Sci. and Art, Edinburgh, 1883, 23, 5, No. 1. (Page 138.) 



Fig. 3.— D. glabra, W. & E. Right valve and tail. M. Sc. A. Edin., 1883, 23, 5, 

 No. 4. (Page 138.) 



Fig. 4. — D. glabra, W. & E. Crushed carapace and tail. B. M., 59541, 

 No. 28. (Page 139.) 



Fig. 5. — D. granulata, W. & E. Right valve, imperfect. M. Sc. A. Edinb., 

 Coutts, 1887, f|, No. 9. (Page 145.) 



Fig. 6 a. — D. granulata, W. & E. Carapace, somewhat crushed and imperfect. 

 B. M., 59541, No. 10 ; also PI. XX, fig. 3, magnified. (Page 144.) 



Fig. 6 b. — The same. Part of the surface. X 20. 



Fig. 7. — D. testudinea, Scouler. Carapace crushed and imperfect. B. M., 

 59541, No. 15. See also PI. XXII, fig. 3, cephalic part magnified. (Page 147.) 



Fig. 8. — D. testudinea, Scouler. Two valves crushed and displaced. B. M., 

 I, 109, No. 21. (Page 147.) 



Fig. 9. — D. testudinea, Scouler. Two valves overlapping. Museum of 

 Practical Geology, 6268, ff . (Page 148.) 



