PLATE XXIII. 



(All the figures are of the natural size.) 



Fig. 1. — Dithyrocaris Golei, Portlock. Right valve nearly perfect, and part 

 of another overlying; also PI. XXIV, fig. 4. M. P. G., 6262, ^ (= Portlock's 

 pi. xii, fig. 2). (Page 164.) 



Pig. 2.—D. Golei, Portlock. Tail. M. P. G., 6261, Kf- (Portlock's pi. xii, fig. 4). 



Fig. 3.— J). Golei, Portlock. Tail. M. P. G., 6261, Sp- (Portlock's pi. xii, fig. 5). 



Fig. 4.—D. Golei, Portlock. Tail. M. P. G., 6265, \A (Portlock's pi. xii, fig. 3 a). 



Fig. o.—D. lateralis. M'Coy. Tail. M. G. S. Sc, m 4268 b, and counterpart, 

 m 42667 £, No. 26. 



Fig. 6.— D. lateralis, M'Coy. Tail. Mus. Cambridge. 



Fig. 7.—D. testudinea {?), Scouler. Tail. B. M., 59541, No. 30. (Page 150.) 



Fig. 8.—D. testudinea, Scouler. Tail. B. M., Rankin, No. 29. (Page 151.) 



Fig. 9. — D. Dunnii, sp. nov. Tail. Dunn Coll., - h -. 



Fig. 10. — D. Dunnii, sp. nov. Tail. Dunn Coll., -/. 



Fig. 11. — D. glabra, W. & E. Two displaced valves and a tail. M. Sc. A. 

 Edinb., 1886, 91, 1, No. 5. (Page 140.) 



