1911] Teller, Fossils from the Palaeozoic Formations. 257 



Chariocephalus whitfieidi Hall. Potsdam. 



Ptychaspis minisccensis, Sixteenth Ann. Kept. N. Y. State Cab. of 



Nat. Hist., Hall, 1803, p. 171, pi. 16, figs. 41-47, and ply 10, 



fig's. 21, 22. 

 Ptychaspis miniscamsis, Sixteenth Ann. Kept. X. Y. State Cab. of 



of Nat. Hist., Hall, 1S63, p. 17.3, pi. 6, figs. 19-53, and pi. 10, 



fig. 20. 

 Locality — Trempealeau, Wis. 

 Types — Am. Mus. of Nat. Hist. 



Conaspis eos Hall = Ptychoparia cos. 



Conocephalites anatinus Hall = Ptychoparia anatina. 



Conocephalites binodosus Hall = Ptychoparia binodosa. 



Conocephalites cnlymenoides Whitfield = Ptychoparia calymenoides. 



Conocephalites d\ xdematus Hall = Ptychoparia diademata. 



Conocephalites (Arionellus ?) dorsalis Hall = Ptychoparia dorsalis. 



Conocephalites eos Hall = Ptychoparia cos. 



Conocephalites eryon Hall = Ptychoparia eryon. 



Conocephalites (Ptychaspis ?) explanatus Whitfield = Ptychaspis 

 exptanatus. 



Conocephalites hamulus Shumard = Anomocare hamulus. 



Conocephalites hamulus Hall = Anomocare hamulus. 



Conocephalites iowensis Shumard = Crepicephalus ioivensis. 



Conocephalites iowensis Hall = Crepicephalus iowensis. 



Conocephalites minor Shumard = Ptychoparia minor. 



Conocephalites nactus Hall = Ptychoparia nacta. 



Conocephalites nasutus Hall = Ptychoparia nasuta. 



Conocephalites optatus Hall = Conocoryphe optata. 



Conocephalites perseus Hall = Ptychoparia perseus. 



Conocephalites quadratus Whitfield = Ptychoparia quadrangularis. 



Conocephalites shumardi Hall = Ptychoparia shumardi. 



Conocoryphe optata (Hall.) Upper Cambrian. 



Conocephalites optatus. Sixteenth Ann. Kept. N. Y. State Cab. of 



Nat. Hist., Hall, 1863, p. 222, pi. 5a, fig. 7. 

 Conocoryphe optata, Bull. Am. Mus. of Nat. Hist.. Whitfield, 1898, 



Vol. 11, Pt. 1, p. 8. 

 Locality — Trempealeau, Wis. 

 Types — Am. Mns. of Nat^ Hist. 



