4 PKOF. T. R. JONES ON SOME TAL^lilOZOlC OSTRACODA 



VIII. Betrichia. Ranging from the Lower Silurian to the Car- 



boniferous. 



1. B. trisuhata, Hall. PL I. fig. 2. Upper Silurian. New- 



York State. 



2. B. Ilallii, sp. nov. PI. lY.fig. 21. Upper Silurian. New- 



York State. 



3. B. aranulata^ Hall. PI. I. fig. 3. Upper Silurian. New- 



York State. 



4. B. oculina, Hall. PL I. fig. 4. Upper Silurian. New- 



York State. 



5. B. Biwhicma ?, Jones. PI. III. fig. 25. Lower Silurian. 



Cincinnati. 



6. B. parasitica (Hall). Woodcut, fig. 1, p. 17. Upper 



Silurian. New-York State. 



7. B. ClarJcei, sp. nov. Woodcut, fig. 2, p. 17. Upper 



Silurian. New- York State. 



8. B. ceqiii/atera, Hall. PI. II. fig. 6. Upper Silurian. Nova 



Scotia. 



9. B. tuherculatn, Boll, var. pustulosa^ Hall. PI. II. fig. 1. 



Upper Silurian. Nova Scotia. 



10. B. 7iamiUo7iensls, sp. nov. PI. II. fig. 3. Hamilton Group. 



New-York State. 



11. B. ciliata, Emmons. PL IIL figs. 12-16, and PL lY. 



• figs. 16-18. Lower Silurian. Cincinnati. 



12. B. oculifera, Hall. PL lY. figs. 19, 20. Lower Silurian. 



Cincinnati. 



IX. IsocHiLiNA. Prom the Lower Silurian to the Devonian. 



1. /. lineata, sp. nov. PL II. figs. 5 & 8. Hamilton Group. 



New- York State. 



2. /. (2)fabacea, sp. nov. PL II. fig. 11. Hamilton Group. 



New- York State. 



3. I. Seeli/i (Whitfield). PL I. fig. 7. Lower Silurian. Lake 



Champlain. 



4. /. (jregaria (Whitfield). PL I. figs. 9, 10. Lower Silurian. 



Lake Champlain. 



5. /. cristata (Whitfield). PL I. fig. 8. Lower Silurian. Lake 



Champlain. 



6. Isochilina ?, sp. PL I. fig. 15. Lower Silurian. Lake 



Champlain. • 



X. Lepeeditia. Prom the Lower Silurian to the Carboniferous. 



1. i:.(?) seneca, Hall. PL I. figs. 13, 14. Hamilton Group. 



New-York State. 



2. Z. (?) simia^a, HalL PL I. fig. 12. Upper Silurian. Nova 



Scotia. 



3. L. Jiudsonica, Hall. PL I. figs. 5 & 11. Hamilton Group. 



New- York State. 

 3*. L. hudsonica? PL IIL fig. 20. Lower Silurian. Cin- 

 cinnati. 



