10 North American Palaeozoic Crustacea. 



oculifera, Hall & Whitfield, 1875 ; Pal, Ohio, vol. 2, p. 103, pi. 4, figs. 9, 10. 

 ociilifera, Miller, 1874; Cincinnati Quart. Jour. Sci., vol. 1, p. 118. 

 oculina, Hall, 1859; Pal. New York, vol. 3, p. 378, pi. 79 b, figs. 2a-e. 



Lower Helderberg. 

 Pennsylvanica, Jones, 1858 ; Annals & Mag. Nat. Hist. London, 3d series, 



vol. 1, p. 253, pi. 10, figs. 16, 17, 18. Onondaga. 



Pennsylvanica, Jones, 1858 ; Geol. Survey Pennsylvania, vol. 2, p. 834, 



figs. 696. 

 petrifactor, White & St. John ; see Beyrichia lithofactor. 

 petri/hctor , var. relata, White & St. John ; see Beyrichia lithnfactor, var. velata. 

 persulcata, Ulrich, 1879 ; Jour. Cincinnati Soc. Nat. Hist., vol. 2, p. 12, 



pi. 7, fig. 6. Hudson River, 



plagosa, Jones, 1858 ; Annals & Mag. Nat. Hist. London, 3d series, vol. 1, 



p. 243, pi. 9, fig. 2. Niagara, 



punctulifera. Hall, 1861 ; Desc. new species Fossils, p. 83. Hamilton, 



punctulifera, Hall, 1862; 15th Kept. New York State Cab. Nat. Hist. p. 111. 

 pustulosa, Hall, 1860; Canadian Naturalist, vol. 5, p. 157, fig. 19. 



Silurian. 

 pustulosa, Dawson, 1868; Acadian Geology, p. 608, fig. 216. 

 quadrilirata. Hall & Whitfield, 1875 ; Pal. Ohio, vol. 2, p. 105, pi. 4, 



figs. 6, 7. Hudson River. 



quadrilirata. Miller, 1875 ; Cincinnati Quart. Jour. Sci., vol. 2, p. 351. 

 regularis, Emmons, 1855 ; American Geology, pt. 2, p. 219, fig. 74 b. 



Hudson River, 

 regularis. Miller, 1875 ; Cincinnati Quart. Jour. Sci., vol. 2, p. 351. 



Compare B. quadrilirata, Hall & Whitfield. 

 reniformis, Jones, 1858 ; Geol. Survey Canada, Dec. 3, p. 91, pi. 11, fig. 1. 



See B. Logani. Chazy, 



Richardsoni, Miller, 1874; Cincinnati Quart. Jour. Sci., vol. 1, p. 347, 



fig. 40. Hudson River, 



rugulifera, Jones, 1858 ; Annals & Mag. Nat. Hist., 3d series, London, 



vol. 1, p. 242, pi. 9, fig. 4. Niagara, 



sigillata, Jones, 1858 ; Annals & Mag. Nat. Hist., 3d series, Loudon, vol. 1, 



p. 242, pi. 9, fig. 5. Niagara. 



simplex (Jones) Emmons, 1855 ; Am. Geology, vol. I, pt. 2, p. 218, fig. 74 a. 



Hudson River. 

 Cytherina spinosa, Hall, 1852 ; Pal. New York, vol. 2, p. 317, pi. 67, figs, 17-20. 



Niagara, 

 striato-marginatus. Miller, 1874; Cincinnati Quart. Jour. Sci., vol. 1, 



p. 233, fig. 26. Hudson River, 



symmetrica, HaU, 1852; Pal. New York, vol. 2, p. 317, pi. 67, fig. 16. 



Niagara, 

 trisulcata, Hali; 1859 ; Pal. New York, vol. 3, p. 381, pi. 79, figs. 5 a, b. 



Lower Helderberg. 

 tumifrons, Hall, 1871 ; Desc. new species Foss. Hudson River group, p. 7. 

 tumifrons, Hall, 1872; 24th Rept. New York State Mus. Nat. Hist., 



p. 231, pi. 8, fig. 11. Hudson River. 



