366 CALIFORNIA ACADEMY OF SCIENCES. 



Leperditiu.!:. 



Leperditia Eouault, 1851; Bull. Soc. Geol. France, 2d series, vol. 8, p. 



377. Cambrian. Carboniferous. 



IsocHiLiNA Jones, 1858; Annals Mag. Nat. Hist., London, 3d series, vol. 



1, p. 248. Cambrian. Devonian. 



JoNESELLA Ulrich, 1890; Jour. Cin. Soc. Nat. Hist., vol. 13, p. 121. 

 Lepiditta Matt., 1885; Trans. Eoy. Soc. Canada, vol. 3, p. 62. Para- 



doxides zone. Taconic. 



Beyrichid^. 



Beyrichia McCoy, 1846; Synopsis Sil. Foss. Ireland, p. 57. 



Cambrian. Carboniferous. 

 Beyrichiella J. & K., 1886; Geol. Mag., new series, decade 3, vol. 3, p. 

 438. Carboniferous. 



Beyrichiopsis J. & K., 1886; Geol. Mag., decade 3, vol. 3, p. 484. 



Carboniferous. 

 Klcedenia Jones and Holl, 1886; Annals Mag. Nat. Hist., London, 5tli 

 series, vol. 17, p. 362. Silurian. 



HiPPONiCHARiON Matt., 1885; Trans. Koyal Soc. Canada, vol. 3, p. 64. 

 Paradoxides zone. Taconic. 



Beyrichina Matt., 1885; Trans. Boy. Soc. Canada, vol. 3, p. 65. Para- 

 doxides zone. Taconic. 

 Ulrichia Jones, 1890; Quart. Jour. Geol. Soc. London, vol. 46, p. 543. 



Devonian. Carboniferous. 

 Depranella Ulrich, 1890; Jour. Cin. Soc, Nat. His., vol. 13, p. 117. 



Cambrian. 

 Ctenobolbina Ulrich, 1890; Jour. Cin. Soc. Nat. His., vol. 13, p. 108. 



Silurian. Devonian. 

 Tetradella Ulrich, 1890; Jour. Ciu. Soc. Nat. His., vol. 13, p. 112. 



Cambrian. 

 HippA Barr., 1872, Syst. Sil. Bohfeme, vol. 1, suppl., p. 516. 



Primitid^. 



Primitia Jones and Holl, 1865; Annals Mag. Nat. Hist., Loudon, 3d 

 series, vol. 16, p. 416. Cambrian. Carboniferous. 



Primitopsis Jones, 1887; Notes on some Sil. Ostracoda from Gothland, 

 p. 5. Silurian. Devonian. 



ScHMiDTELLA Ulrich, 1S92; The Am. Geologist, vol. 10, p. 269. Cambrian. 



Aparchites. 



Aparchites Jones, 1889; Annals Mag. Nat. Hist., 6th series, vol. 3, p. 

 385. Cambrian. Silurian. Devonian, 



Eurychillina Ulrich, 1889; Contrib. Micro. PaliBont., part 2, p. 52. 



Cambrian. 

 Halliella Ulrich, 1890; Jour. Cin. Soc. Nat. Hist., vol. 13, p. 184, 



Devonian. 



