SILTJRIAlf OSTKACODA FROM NORTH AMERICA, ETC. 



545 



Nos. conti- 

 nued from 

 p. 544. 



14. 

 15. 



16. 

 17. 

 18. 



19. 

 20. 



21. 



22. 



§ II. Silurian Ostracoda. 

 § I. F7'om Anticosti. Arranged geologically. 



N"os. of 



the 

 Silurian 

 Species. 



1. Beyrichia diffissa, sp. nov. ... 



2. Leperditia frontalis, sp. nov. 



3. JPrimitia Billingsii, sp. nov. 



4. Bollia semilunata, sp. nov. . 



5. Bythocypris (?) Lindstrcemii, 



sp. nov 



6. Bairdia anticostiensis, sp. n. 



7. Macrocypris(?) suhcylmdrica, 



sp. nov 



8. Bythocypris {"i) ohtusa, sp. n. 



9. Folycope sublenticular is, sp. 



PI. XXI. 



10. 

 9. 



11. 

 3. 



5. 

 4. 



Anticosti 

 G-roup. 



Division 3. " 

 „ 3. 



: ::} 



Lowest. 



Upper or 

 Middle 

 Silurian. 



Middle or 



Lower 

 Silurian. 



Lower 

 Silurian. 



Genera from Anticosti. 



Generic TSos. 



(See pp. 535-543 



for I.-VIII.) 



I. Primitia in Division 1. 



II. Beyrichia 



lY. BoLLIA 



IX. Leperditia 



X. Bythocypris ? 



XI. Bairdia , t- 



XIL Macrocypris? \ }!PJT^__ 



XIII. POLYCOPE , 



3. 

 1. 



3. 



1 and Lowest Div. 



Division. 



§ II. From Dundas, Ontario, Canada, 



Nos. conti- 

 nued from 

 p. 550. 



23. 

 24. 



Nos. of 



the 

 Silurian 

 Species. 



10. 



11. 



Primitia rmmdula, J. 

 Beyrichia Kloedeni, M'Coy. 



§ III. From the Dominion of Canada, Coll. Geological Survey 

 of Canada. 



25. 12. Primitia mundula, J. 



26. 13. ovata (?), J. & H. 



27. 14. Beyrichia tuherculata, Boll. 



• , var. fustulosa (Hall). 



, var. Bronni (Eeuter). 



(Bquilatera, Hall. 



Primitia mundula, J., and varieties. 

 Ulrichi, J. 



28. 

 29. 

 30. 

 31. 

 32. 

 33. 

 34. 

 35. 



I^OTE.- 



15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 



, spp. 



Isochilina Ottawa, 



Upper Silurian. 



!- Lower Silurian. 



J., var. 

 Leperditia, spp. 

 Beyrichia, spp. 

 Polycope, sp. 



The foregoing list supplies us with one genus (Polycope) as an addition 

 to the Lower-Silurian forms (already known in the Devonian and Carboni- 

 ferous strata) ; and enables us to place Macrocypris, Bairdia, and Bytho- 

 cypris more certainly than heretofore in the Lower-Silurian column of the 

 Table at page 2 of the February No. of the Quart. Journ. Geol. Soc. 



