PLATE XXV. 



Fig. 1. — Dithyrocaris glabra, W. & E. Part of the dorsal ridge of one of 

 two valves. X 2£. B. M., 59541, No. 6. (Page 139.) 



Fig. 2.— D. glabra, W. & E. Part of the dorsal ridge of the left valve. X 2£. 

 B. M., 59541, No. 8. (Page 139.) 



Fig. 3 a. — D. insignis, sp. nov. Part of right valve among displaced fragments 

 of two valves. Mus. Leeds Coll. X 2^. (Page 159.) 



Fig. 3 b. — The same. Part of the surface. X 10. 



Fig. 3 c. — The same. Part of the surface. X 50. 



Fig. 4a. — Possibly from the same specimen. Part of a dorsal ridge. X 3. 



Fig. 4 b. — The same. Part of its surface. X 10. 



Fig. 4 c. — The same. Outline of its elevation. X 10. 



Fig. 4d. — The same. Part of its surface. X 10. 



Fig. 4 e. — The same. Part of its surface. X 50. 



Fig. ha. — Probably from the same specimen. Fragment of a valve. X 10. 



Fig. 5 b. — The same. Part of its surface. X 50. 



Fig. 6 a. — D. Scouleri, M'Coy. Carapace and tail. Copied from M'Coy's 

 * Carb. Foss. Ireland,' pi. xxiii, fig. 2. (Page 155.) 



Fig. 6 b. — The same. ■) 



i?' r mi ? Parts of the ridges, 



.tig. 6 c. — The same. ) 3 



Fig. 7.—D. sp. (?). From a plaster cast. Griffith Coll. Dublin. (Page 157.) 



Fig. 8 a. — Hibbertia orbicularis, gen. and sp. nov. X 2. (Burdiehouse.) 



Fig. 8 b. — The left-hand postero-ventral angle. X 5. 



Fig. 9 a. — D. Golei (?) vel tricomis (?). A separate dorsal ridge. M. G. S. Sc, 

 F H, No. 20. (Page 175.) 



Fig. 9 b. — The same. Part of its surface. X 5. 



Fig. 9 c. — The same. Outline of its elevation. X 5. 



Fig. 10 a. — Kirkbya plicata, J '. & K. Carapace, showing the right valve. X 25. 

 On the same specimen with fig. 9. (Page 175.) 



Fig. 10 b. — The same. Dorsal view. X 25. 



Fig. 10 c. — The same. Part of the surface. X 50. 



