1911] Teller, Fossils from the Palaeozoic Formations. 265 



Ogygia barrandii (Hall.) Trenton (Ord.) 



Aiaphas barrandi, Kept. Geol., Lake Superior Land District, Hall, 



1851, Pt. 2, p. 210, pi. 27, figs. la-d. 

 Asaphas barrandi, Geol. of Wis., Hall, 1S62, Vol. 1, p. 41, fig. 4. 

 Ogygia barrandii, Bull. Am. Mus. of Nat. Hist,. Whitfield. 1898, 



Vol. 11, Pt. 1, p. 70. 

 Locality— Platteville, Wis. 

 Types— Am. Mus. of Nat. Hist. 



PemphigaspiS bullata Hall = Microdiscus ? bullatus. 



Ptychaspis explantus Whitfield. Potsdam. 



Conocephalites (Ptychaspis ?) explanatus, Ann. Eept. Geol. Surv. 



Wis., Whitfield, 1S79, p. 48. 

 Conocephalites (Ptychaspis ?) explanatus, Geol. of Wis.. Whitfield, 



1882, Vol. 4, p. 181, pi. 1. figs. 27, 28. 

 Locality — Hudson, Wis. 

 Types— Univ. of Wisconsin. 



Ptychaspis granulosa Hall = Ptychaspis striata. 



Ptychaspis miniscaensis (Owen.) Upper Cambrian. 



Dikelocephalus miniscamsis, Geol. Eept. Wis., Iowa and Minn., 



Owen, 1852, p. 574, pi. 1, figs. 3 and 12, and pi. 1A, figs. 4, 5. 

 Ptifchaspis miniscansis, Sixteenth Ann. Eept. N. Y. State Cab. of 



Nat. Hist., Hall, 1863, p. 171, pi. 6, figs. 41-46, and pi. 10, 



figs. 21, 22. 



Obs. Probably the same as Chariocephalus whitfleldi. 



Locality — Trempealeau, Wis. 

 Types-Am. Mus. of Nat. Hist. 



Ptychaspis minuta Whitfield. Upper Cambrian. 



Ann. Eept. Geol. Surv. Wis., Whitfield, 1S77, p. 55. 



Geol. of Wis., Whitfield, 1882, Vol. 4, p. 186, pi. 1, figs. 25. 26. 



Locality— Eoberts Store, St. Croix Co.. Wis. 



Types — Univ. of Wisconsin. 



Ptychaspis striata Whitfield. Upper Cambrian. 



Dilelocephalits granulosus, Geol. Eept. Wis., Iowa and Minn., 



Owen, 1852, p. 575, pi. 1, figs. 5, ?, and 7. 

 Ptychaspis granulosa, Sixteenth Ann. Eept. N. Y. State Cab. of 



Nat. Hist., 1863, p. 173, pi. 6, figs. 33-40. 

 Ptychaspis striata, Bull. Am. Mus. of Nat. Hist.. Whitfield, 1898, 



Vol. 11, Pt. 1, p. 12. 

 Locality — Trempealeau . Wis. 

 Types — Am. Mus. of Nat. Hist. 



