346 CALIFORNIA ACADEMY OF SCIENCES. 



PEOTYPUS. PTYCHASPIS. 



SENECTus Wal., 18S6; Bull. U. S. Geol. Survey No. 30, p. 213, pi. 31, 



figs. 2, 2 a-c. 

 SENECTUS Wal., 1890; 10th Eep. U. S. Geol. Survey, p. 655, pi. 98, 



fig. 7, 7 a-c. Oleuellus zoue. 

 SENECTUS var. PARVULUS. For other references see Bathyurus par- 



vulus. Walcott 10th Rep. U. S. Geol. Survey, p. 568, refers it to 



a variety of P. senectus, 

 Pterocephalia Eoemer, 1852; Kreid. von Texas, p. 93. 



Conocephalites (Pterocephalia) laticeps H. & W., 1877; U. S. Geol. 



Expl. 40th Par., vol. 4, p. 221, pi. 2, figs. 4-7. Pogonip Mt.. 



White Pine, Nev. 

 PUjchopar'ia (Pterocephalia) laticeps Wal., 1884; Pal. Eureka Dist. 



Mon. U. S. Geol. Survey, vol. 8, p. 59. Eichmoud Mine Shaft, 



Euby Hill, northeast side of canon, and in the Hamburg belt, 



Nev. 

 Ptychoparia (Pterocephalia) occidens Wal., 1884; Pal. Eureka Dist. 



Mon. U. S. Geol. Survey, vol. 8, p. 58, pi. 9, fig. 21. Hamburg 



Eidge, Nev. 



sancti-sab^ Eoemer, 1849; Texas, p. 421. San Saba Shale, Texas. 



SANCTi-SABiE Eoemor, 1852; Kreid. von Texas, p. 93, pi. 11. 



Ptychaspis Hall, 1863; 16th Eep. New York State Cab. Nat. Hist., p. 170. 

 barabuensis Winch., 1864; Am. Jour. Sci., 2d series, vol. 37, p. 230. 



Sauk Co., Wis. Taconic. 



yl Wone/tes CYLiNDRicus Bill., 1865; Pal. Foss., vol. 1, p. 406, fig. 385. 



Point Levis, Quebec. 

 (Jonoceph (Ptychaspis) explanatus Whitf., 1880; Ann. Eep. Geol. 



Survey Wisconsin, 1879, p. 48. Hudson, Wis. Taconic. 



Conoceph (Ptychaspis?) explanatus Whitf., 1882; Geol. Wisconsin, 



vol. 4, p. 181, pi. 1, figs. 27, 28. 

 Dicellocejjhallus granulosus Owen, 1852; Eep. Geol. Survey Wiscon- 

 sin, Iowa and Minnesota, p. 575, pi. 1, fig. 7. Taconic. 

 granulosa Hall, 1863; 16th Eep. New York State Cab. Nat. His., p. 



173, pi. 6. figs. 33-40. Trempaleau and Miniska. (^ee P. striata.) 

 granulosa Whitf., 1878; Ann. Eep. Geol. Survey Wisconsin, 1877, 



p. 34. 



granulosa Whitf., 1882; Geol. Wisconsin, vol 4, p. 185, pi. 1, fig. 24. 



granulosa Whitf., 1882; Geol. Wisconsin, vol. 4, p. 185. pi. 1, fig. 24. 



Dicellocephalus miniscaensis Owen, 1852; Eep. Geol. Survey Wiscon- 

 sin, Iowa and Minnesota, p. 574, pi. 1, figs. ,3, 12; pi. 1 a, figs. 

 4, 5. Trempaleau and Miniska, Wis. 



miniscaensis Hall, 1863; 16th Eep. New York State Cab. Nat. Hist., 



p. 171, pi. 6, figs. 41-46; pi. 10, figs. 21, 22. 



minuta Whitf., 1878; Ann. Eep. Geol. Survey Wisconsin, 1877, p. 55. 



At Eobert's Shore, St. Croix Co., Wis. Taconic. 



