PLATE IV. 



xSOdiam. 



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Fig. 



1. Pontocypris trigonalis, sp. nov. (Page 3.) Carapace ; right valve seen. (See also 



Pi. Ill, figs. 25 and 26.) 



2. — — — Edge outline. The translucent edges 



show the lines of the internal flanges. 



3. — Bosquetiana, sp. nov. (Page 4.) Left valve, inside. Reproduced 



from pi. vi, fig. 18/! 



4. Bairdia Harrisiana, Jones, var amplior, nov. (Page 8.) Left valve, inside. 



5. GytJierideis parallela, &]). no'v. (Page 43.) Eight valve. ^ \ 



6. — — — Edge outline.^ j 



7. Gythereis ornatissima (Eeuss), Young, in the reticulate stage. (Page 21.) Cara- 



pace ; left valve shown. Eeproduced accurately 

 instead of pi. iv, fig. 11 h. 



8. — — — Dorsal edge. Eeproduced for fig. 11 h' . 



9. — — var. reticulata, nov. (Page 24.) Eight valve. 



10. — — — — Beaded. Left valve. 



11. — — — — Dorsal view. 



12. — — — — Posterior outline. 



13. — — var. radiata, nov. (Page 25.) Eight valve. 



14. — — var. tiuda, nov. (Page 23.) Inside of left valve. To replace 



pi. V, fig. 13 a. 



15. — Icenica, sp. nov., var. quadrata, nov. With low ridges. (Page 27. See ^ 



also PI. I, fig. 62.) Carapace, showing j 



left valve. [> x 30 



16. — — — — Ventral view. 



17. — — — — Posterior view. J 



18. — Wrightii,s^. Taov. (Page 25.) Eight valve. X 25 



19. Cytheropteron concentricum (Eeuss). (Page 31.) Showing the ornament in the 



advanced state with continuous ridges. 

 (See also PI. I, figs. 6—10.) 



20. — Sherborni, sp. nov. (Page 42.) Eight valve. ") 



21. — — — Ventral view. j 



22. — umbonatum (Will.), var. acanthoptera {May:s?,oxi). (Page 41.) Leff 



valve. (See PI. I, figs. 11—13.) 



23. ■ — — — — (Marsson). Dorsal view. 



24. — — — — — Posterior view. 



25. — — — — — Narrow form. 



Left valve. 



26. — — — — — Narrow form. 



Dorsal view. 



27. — — — — — Narrow form. 



Left valve. 



28. — — — — — Narrow form. 



Left valve. 



29. — — — — — Narrow form. 



Dorsal valve. 



30. — — var. longispinata (Marsson). (Page 41.) Eight valve. 



(The antero-ventral lump is adventi- 

 tious. See also PI. IH, figs. 11—13.) 



31. — — — (Marsson). Carapace, ventral view. 



32. — pedatum (M.&T&son),\&v. salebrosa,-ao\. (Page 39.) Left valve. (See 



also PI. Ill, fig. 8.^ 



33. — — — (Page 38.) Eight valve. 



34. — — — Ventral view. 



35. — — — Anterior view. 



36. — alatum (Bosquet), var. cornuta (Bosquet). (Page 36.) Left valve. 



37. Bseudocy there ? simplex, sp. nov. (Page 30. See also PI. II, figs. 58 — 60.) Inside 



of left valve. 



38. — — — Edge outline. 



39. Oytherella ovata (Eomer). (Page 44.) Oval variety. Right valve. Corrected 



for pi. vii, fig. 24 h. 



40. CytJierideis acuminata (Eeuss). (Page 43.) Carapace (damaged at posterior end)." 

 41- — — — Edge outline of a single valve." ^ 



' Figured with posterior end upwards by mistake. ' Figured with the binder end upwards by mistake. 



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