346 CALIFORNIA ACADEMY OF SCIENCES. 



PROTYPUS. PTYGHASPIS. 



SENECTUS Wal., 1886; 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. Olenellus zone. 

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



viiluH. Walcott 10th Eep. U. S. Geol. Survey, p. 568, refers it to 



a variety of P. senectus, 

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



Conocephaliles (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. 

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



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



Ruby 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. S, p. 58, pi. 9, fig. 21. Hamburg 



Ridge, Nev. 



SANCTI-SAB.E Roemcr, 1849; Texas, p. 421. San Saba Shale, Texas. 



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



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



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



Sauk Co., Wis. Taconic. 



Arionellus CYLitiUHivvs Bill., 1865; Pal. Foss., vol. 1, p. 406, fig. 385. 



Point Levis, Quebec. 

 Conoceph (Ptychaspis) explanatcs Whitf., 1880; Ann. Rep. Geol. 



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



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



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

 Dicellocephallus granulosus Owen, 1852; Rep. Geol. Survey Wiscon- 

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

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



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

 granulosa Whitf., 1878; Ann. Rep. 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; Rep. 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 Rep. New York gtate 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 Robert's Shore, St. Croix Co., Wis. Taconic. 



