PLATE XXXI. 



of the ultimate 

 Ventral aspect. 



■ (Page 150.) 



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

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



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

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



Fig. 3. — D. festudinea. 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&.— Part of one of the stylets. X 10. 

 Fig. 4 c. — Pitted mai'gin of one of the stylets. X 30. 

 Fig. 4 d. — Ornament of the abdominal segment. X 30. 

 Fig. 5. — Ghasnocaris tenxiistriata (M'Coy). Left valve of a small individual, 

 imperfect, showing the longitudinal striee. 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, j 

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

 No. 602. Eccup, Yorkshire. 



Fisr. 7 h. — Part of the ornament of fig. 7 a. X 20. 



8 a. — D. insignis, sp. nov., var. raultijugata, nov. Posterior 



Yorkshire 



- (Page 162.) 



Fis. 



Nat. size. 



College Mus., 



8 a. Portion of the dorsal 

 X 20. 



(Page 163.) 



half of a left-hand valve. 

 No. 43. Eccup, Yorkshire. 



Fig. 8 h. — Part of ornament of fig. 

 ridge, obscured with shell on one edge. 



Fig. 8 c. — Part of the same. X 50. 



Fig. 9. — D. insignis, var. midtijngata, 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.) 



