PLATE XXXI. 



Fig. 1. — Dithyrocaris testudinea, Scouler. Part of the ornament of PI. XIX, 

 fig. 8, showing pores. X 40. British Museum, I 109, No. 21. (Page 147.) 



Fig. 2. — D. testudinea. Part of the ornament of PI. XXI, fig. 3, showing 

 intermediate striation. X 50. Mus. Edinb., No. 13. (Page 149.) 



Fig. 3. — D. testudinea. Part of the ornament of PI. XXI, fig. 6, showing pits. 

 X 40. Mus. Edinb., No. 12. (Page 150.) 



Fig. 4 a. — D. testudinea, Scouler. A part 

 abdominal segment and the trifid appendage. 

 X 2. B. M., 59541, No. 27 ; PI. XXI, fig. 5. 



Fig. 4 b. — Part of one of the stylets. X 10. 



Fig. 4 c. — Pitted margin of one of the stylets. 



Fig. 4 d. — Ornament of the abdominal segment. 



Fig. 5. — Chsenocaris tenuistriata (M'Coy). 

 imperfect, showing the longitudinal strias. 



of the ultimate 

 Ventral aspect. 



' (Page 150.) 



X30. 

 X 30. 



Left valve of a small individual, 

 X 3^. Woodwardian Museum, 



Cambridge. Carboniferous Limestone. Settle, Yorkshire. (Page 178.) 



Fig. 6. — Dithyrocaris insignis, sp. nov. Trifid tail-piece. Ventral aspect. 

 Nat. size. Leeds Coll. Mus., No. 44b. Eccup, Yorkshire. (Page 162.) 



Fig. 7 a. — D. insignis, sp. nov. Ultimate abdominal plate, 

 imperfect. Ventral aspect. X 3. Yorkshire Coll. Mus., Leeds, 

 No. 602. Eccup, Yorkshire. 



Fig. 7 b. — Part of the ornament of fig. 7 a. x 20. 



Fig. 8 a. — D. Insignis, sp. uov., var. mtdtijugata, nov. Posterior 

 half of a left-hand valve. Nat. size. Yorkshire College Mus., 

 No. 43. Eccup, Yorkshire. 



Fig. 8 b. — Part of ornament of fig. 8 a. Portion of the dorsal 

 ridge, obscured with shell on one edge. X 20. 



Fig. 8 c. — Part of the same. X 50. 



Fig. 9. — D. insignis, var. multijugata, nov. An imperfect left-hand valve, 

 with the juxta-dorsal ridge of the adjoining valve. Nat. size. Yorkshire College 

 Mus., No. 40. Eccup, Yorkshire. (Page 163.) 



► (Page 162.) 



(Page 163.) 



