PALEOZOIC OSTRACODA. 9T 



APPENDIX. 



NOTES ON THE SPECIES OP OSTRACODA DESCRIBED AND FIGURED IN 



DECADE III, OF THE GEOLOGICAL SURVEY OF CANADA, 



PUBLISHED IN 1858. 



Since the date of this publication a better knowledge of these and 

 their allied forms has been obtained ; and, their grouping and relation- 

 ship being better understood, changes in their nomenclature have 

 taken place. 



1. Beyrichia Logani, p. 91, pi. xi, figs. 1-5. 



This (with its varieties reniformis, fig. 1, and leperditioides, fig. 5, was 

 referred to the genus Primitia in the ' Ann. Mag. Nat. Hist.,' ser. 3^ 

 vol. XYI, 1865, pp. 416, 417, by Jones and HoU, on account of its 

 simple sulcus or pit and the absence of Beyrichian lobes. 



2. Leperditia Canadensis, var nana, p. 92, pi. xi, figs. 6, 7, 9, 10. 



This is the typical L. canadensis. At first some l/eperditia^, allied to 

 Conrad's Ij. fabulites, were grouped with the foregoing, and in the pre- 

 paration of the memoir in Decade III, the relatively small size of the 

 latter gave rise to the varietal term nana, which is not really required. 

 Fig. T may be regarded as a smooth and rather elongate variety. 



3. Leperditia Canadensis, var. lahrosa, p. 93, pi. xi, fig. 8. 



This was originally proposed as a variety in the "Ann. Mag. Nat. 

 Hist.," ser. 3, vol. I, 1858, p. 245, where there is no mention of " nana.''' 

 It may well be specifically distinct. 



This small Leperditia has an oblong shape and a definite lip or fiat 

 margin at each extremity. 



As formerly indicated, this form, now regarded as a species, is more 

 nearly allied to L. Canadensis than to L. fabulites. 



Note. — Leperditia Josephiana, Louckiana, and labrosa are known from 

 the Trenton Limestone of Canada. Ij. Josephiana, also from the Tren- 

 ton Limestone of Tennessee, andjD. labrosa from the Black-river Lime- 

 stone of Canada. 



4. Leperditia Canadensis, var. Loucliana, p. 93, pi. xi, fig. II. 



Leperditia Canadensis (?), Jones. Ann. Mag. Nat. Hist., ser. 3, vol. I, 1858, p. 245, 



pi. ix, fig. 16 (afterwards var. Louchiana). 



Leperditia Canadensis, var. Louckiana, Jones. Geol. Surv. Canada, Org. Rem., 



Denade III, 1858, p. 93, pi. xi, fig. 11. 



Leperditia fahvlites (Conrad;, var. Louchiana, Jones. Ann. Mag. Nat. Hist., ser- 



5, vol. VIII, 1881, p. 343. 



Leperditia Louckiana, Jones. Op. cit., vol. XIV, 1884, p. 340. 



5. Leperditia Canadensis, var. Pauquettiana, p. 94, pi. xi, fig. 12. 



6. " " " Josephiana, p. 94, pi. xi, fig. 16. 



