PLATE XXIX. 



Nat. size. Mus. Geol. Surv. 



Quarry, Penton, Cannobie. 



IP- 



a J 



Neihoni, s] 

 Collection, 



i. liov. Caudal appendages. Nat. size, 

 marked K. East Kilbride. 



Neilson 



(Page 187.) 



Proc. Boston Soc. N. H.,' 

 Coal-measures, Illinois. 



Fig. 1. — Dithyrocaris Dunnii, sp. nov. A trifid tail, imperfect. 

 Scotland, F|". No. 17. Larriston Burn. (Page 186.) 



Fig. 2.— D. Dunnii. M. Gr. S. Sc, P f , No. 19. Harebow H 

 Part of a caudal trifid. Nat. size. (Page 186.) 

 Pig. 

 Pig. 

 Pig. 3 c 



Pig. 4. — Bhaehura {Dithyrocaris?) venosa, Scudder. Copied from 

 vol. xix, pi. ix, fig. 3. Caudal appendages, ventral aspect. Nat. siz 

 (Page 188.) 



Fig. 5 a. — Dithyrocaris carlonaria, Meek and Worthen. Copied from ' Geol. Surv. 111.,' vol. v, 

 pi. xxxii, fig. 1 a. Caudal appendages, ventral aspect. la. Coal-measures, Illinois. Nat. size. 

 (Page 190.) 



Fig. 5 h. — D. carlonaria. Sectional area of thick part of the stylet (part of fig. 1 a). 

 Fig. 6. — D. carbon aria. Caudal appendages, dorsal aspect. Copied from M. and "W.'s fig. 1 b. 

 Fig. 7. — D. Kochi, Ludwig. Copied from 'Palseontogr.,' vol. xi, pi. 1, fig. la. Devonian, 

 Herborn, Dilltbal, Nassau. Caudal appendages. Dorsal aspect. Nat. size. (Page 191.) 



Fig. 8. — D. Kochi. Copied from Ludwig's fig. 1. Caudal appendage. Ventral aspect. Nat. 

 size. Devonian, Herborn. (Page 191.) 



Fig. 9. — D. breviaculeata, Ludwig. Copied from ' Palreontogr.,' vol. xi, pi. 1, fig. 2. Caudal 

 appendage. Ventral aspect. Devonian, Butzbacb, Nassau. (Page 191.) 



Fig. 10 a. — D. testudinea, Scouler. An ultimate abdominal segment. Dorsal 

 aspect. Neilson Collection. J. East Kilbride, x 3. 



10 5. — D. testudinea, Scouler. Ventral aspect, x 3. 

 Sectional area, x 3. 

 Ventral aspect, x 3. 

 Ornament, x 100. 

 Dorsal aspect, x 3. 

 Ventral aspect, x 3. 

 Sectional area, x 3. 

 Ornament, x 20. 

 Dorsal aspect, x 3. 

 Ventral aspect, x 3. 

 Sectional area, x 3. 



Diagram of the lines on the outside of an 

 ultimate abdominal segment; the dorsal lines dark and the ventral lines dotted. X 3. 



Fig. 15 a. — Ptychocaris? Jascliei (Kflmer). Copied from ' Pala?ontogr.,' vol. v, 

 pi. ii, figs. 13 a— c. Fragment. Nat. size. Devonian, Klosterholz, Hartz. 

 Fig. 15 b. — Outline of the sectional area. 

 Fig. 15 c. — Magnified part of the ornament. 

 Fig. 16«. — Copied from (Kayser) ' Abhi 

 figs. 13, 13 a. Fragment. Nat. size. 

 Fig. 16 I. — Sectional area. 



F L 



Fig. 10 c. — D. testudinea, Scouler. 

 Fig. 11 a. — D. testudinea, Scouler. 

 Fig. 11 b. — D. testudinea, Scouler. 

 Fig. 12 a. — D. testudinea, Scouler. 

 Fig. 12 b. — D. testudinea, Scouler. 

 Fig. 12 c. — D. testudinea, Scouler. 

 Fig. 12 d. — D. testudinea, Scouler. 

 Fig. 13 a.—D. testudinea, Scouler. 

 Fig. 13 b. — D. testudinea, Scouler. 

 Fig. 13 c. — D. testudinea, Scouler. 

 Fig. 14. — D. testudinea, Scouler. 



I (Page 153.) 



Kart. Preuss.,' vol. ii, Heft 4, pi. 



(Page 193.) 





