PLATE XVni. 



Fig. 1 a. — Dithyrocariti glabra, H. Woodward and R. Etlieridge, jun. Left 

 moiety or valve. Mus. Geol. Survey Scotland, 4368, F ff, No. 11 (= ' Geol. 

 Mag.,' 1874, pi. V, fig. 4). (Page 136.) 



Fiff. 1 f>- — The same. Part of the surface, with and without the outermost 

 film. X 40. 



Fig. 2.—D. glahra, W. & E. Right valve. M. G. S. Sc, 4078, F |f, No. 12 

 (=' Geol. Mag.,' 1874, pi. v, fig. 5). (Page 137.) 



Fig. 3 rt. — D. ovaUs,W. & E. Carapace, crushed and open. M. G. S. Sc, 

 F ^/, No. 4 (=' Geol. Mag.,' 1874, pi. v, fig. 1). (Page 140.) 



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



Fig. 4.— X». granulata, W. & E. Left valve. M. G. S. Sc, F \^, No. 6; 

 also PI. XX, fig. 2, magnified (=' Geol. Mag.,' 1874, pi. v, fig. 2). (Page 142.) 



Fig. 6 a.— D. grnaulata, W. & E. Left valve. M. G. S. Sc, 4076, F ff, 

 No. 13 (=' Geol. Mag.,' 1874, pi. v, fig. 3). (Page 144.) 



Fig. 5 h. — The same. Antero-dorsal region. X 3^. 



Fig. 6.—D. ijranvlata, W. & E, Carapace. Brit. Mus., 5'.»541, No. 9 ; also 

 PI. XX, fig. 1, magnified. (Page 144.) 



Fig. 1.—Gahiptocaris striata, Woodward, sp. M. G. S. Sc, M 576 a, F •^, 

 No. 15 (= ' Geol. Mag.,' 1874, pi. v, fig. 6). Two valves pressed together, 

 showing the left imperfect. 



Fig. 8 a. — Dithyrocaris Belli, Woodward. Two valves overlapping, imperfect. 

 B. M., No. 25 (= ' Geol. Mag.,' 1871, pi. iii, fig. 5). (Page 176.) 



Fig. 8 b. — The same. Postei'o-ventral region of the left valve. X 5. 



Fig. 8 c. — The same. Part of surface. X 15. 



