PLATE XXI. 

 (All of the natural size except Figs. 11 d, 11 e, and 11/.) 



Fig. 1. — Dithyrocaris testudinea, Scouler. Left valve. B. M., 59541, No. 17. 

 (Page 148.) 



Fig. 2. — D. testudinea, Scouler. Inperfect carapace. B. M., 59541, No. 18. 

 (Page 148.) 



Fig. 3. — D. testudinea, Scouler. Right valve. M. Sc. A. Edin., Coutts, 1887, 

 H, No. 13 ; also PI. XXXI, fig. 2. (Page 149.) 



Fig. 4. — D. testudinea, Scouler. Two displaced valves and tail. M. Sc. A. 

 Edin., Coutts, 1887, if, No. 11. (Page 149.) 



Fig. 5. — D. testudinea, Scouler. Abdominal segments and tail. B. M., 59541, 

 No. 27 ; also PL XXXI, fig. 4. (Page 150.) 



Fig. 6. — D. testudinea, Scouler. Right valve. M. Sc. A. Edin., Coutts, 1887, 

 H, No. 12 ; also PL XXXI, fig. 3. (Page 150.) 



Fig. 7 a.— D. Scouleri {?) t M'Coy. Left valve. 1 M r S S F-" 



Fig. 7 b.—D. Scouleri (/•), M'Coy. Counterpart of fig. 7 a. ) ' s 



(bis), No. 17. (Page 155.) 



Fig. 8. — Ghsenocaris tenuistriata, M'Coy, sp. Left valve. B. M., 32938, 

 No. 23. (Vise.) 



Fig. 9. — Ghsenocaris tenuistriata, M'Coy. Left valve. B. M., 44987, No. 24. 

 (Settle.) 



Fig. 10. — Dithyrocaris Scouleri (?), M'Coy. Caudal extremity. B. M., 59541, 

 No. 22. (Page 155.) 



Fig. 11a. — Ghsenocaris tenuistriata, M'Coy, sp. Right valve. Mus. Cambridge. 

 (Settle.) 



Fig. 116. — The same. Edge view. 



Fig. 11 c. — The same. End view. 



Fig. 11 d. — The same. Part of surface at the ventral margin. X 20. 



Fig. lie. — The same. Part of surface at the mesolateral ridge. X 20. 



Fig. 11/ — The same. Part of surface near one end of the valve. X 20. 





