PLATE XXII. 



Fif. 1 a. — Chsenocaris Youngii, sp. nov. Carapace, showing the left valve. 

 J. Young Coll. (Robroystone.) X 7. 



Fig. 1 b. — Tbe same. Carapace, showing the right valve. X 7. 



Fig. 1 c — The same. Carapace, end view. X 7. 



Fig. 1 d. — The same. Carapace, back view. X 7. 



Fiff. 1 e. — The same. Part of surface at the mesolateral ridge. X 30. 



Fig. 2. — Chsenocaris ? Bichteriana, sp. nov. One valve, imperfect at the edges. 

 X 5. From Saalfeld. 



Fig. 3. — D. tcstudinea, Scouler. Cephalic portion. X 3. B. M., 59541, No. 15 ; 

 also PL XIX, fig. 7. (Page 147.) 



Fig. 4. — D. tricornis, Scouler. Part of surface of fig. 5, PL XXIV. X 30. 

 (Page 174.) 



Fig. 5 a. — D. tricornis, Scouler. Part of right valve. Dunn Coll. C 14. 

 (Redesdale.) (Page 173.) 



Fig. 5 h. — The same. Part of the dorsal ridge. X 5. 



Fig. 5 c. — The same. End view of the dorsal ridge. X 5. 



Fig. 5 d. — The same. Left-hand side of part of the dorsal ridge. X 10. 



Fig. 5 c. — The same. Part of the surface. X 15. 



Fig. 6 a.—B. funicnUta, sp. nov. Right valve. M. G. S. Sc, F " , No. 7. 

 (Page 158.) 



Fig. 6 b. — The same. Part of the postero-veutral region. X 8. 



Fig. 6 c. — The same. Part of the ventral edge, x 8. 



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



Fig. 7. — D. Golei, Portlock. Imperfect left valve of small individual. M. G. 

 Surv. Scot., m 4271, F "/ , No. 21. (Page 167.) 



