268 Bulletin Wisconsin Natural History Society. [Vol. 9, No. 4. 



Ptychoparia nacta (Hall.) Upper Cambrian. 



GonocephaUtes nactus, Sixteenth Ann. Eept. N. Y. State Cab. of 



Nat. Hist., Hall, 1863, p. 200, pi. 7. fig-. 58. 

 Ptychoparia nacta, Bull. Am. Mus. of Nat. Hist., Whitfield, 1898, 



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



Locality — Month of Black Biver. Wis. 

 Types— Am. Mus. of Nat. Hist. 



Ptychoparia nasuta (Hall.) Upper Cambrian. 



GonocephaUtes nasutus, Sixteenth Ann. Kept. N. Y. State Cab. of 



Nat. Hist., Hall, 1863, p. 155, pi. 7, figs. 3-9. 

 Ptychoparia nasuta, Bull. Am. Mus. of Nat. Hist.. Whitfield, 1898, 



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



Locality — Kickapoo, Wis. 

 Types — Am. Mus. of Nat, Hist. 



Ptychoparia pero Walcott. Upper Cambrian. 



Proc. U. S. Nat. Museum. Walcott, 1S90, Vol. 13. p. 274, pi. 21, 



fig'. 6. 

 Locality — Trempealeau, Wis. 

 Type — U. S. National Museum. 



i 

 Ptychoparia perseus (Hall.) Upper Cambrian. 



GonocephaUtes perseus, Sixteenth Ann. Kept. N. Y. State Cab. of 

 Nat. Hist., Hall, 1863, p. 153, pi. 7. figs. , 7-23, and pi. 8, fig. 33. 



Ptychoparia perseus, Bull. Am. Mus. of Nat. Hist.. Whitfield. 1898, 

 Vol. 11, p. 12. 



Locality — Kickapoo, Wis. 



Types — Am. Mus. of Nat. Hist. 



Ptychoparia quadrangularis (Whitfield.) Potsdam. 



GonocephaUtes quadrat us, Ann. Sept. Wis. Geol Surv., Whitfield, 



1879, p. 47. 

 GonocephaUtes quadratns, Geol. of Wis.. Whitfield, 1882, Vol. 4, 



p. 180, pi. 1, figs. 15, 16. 

 Ptychoparia quadrangularis, Bull. U. S. Geol. Surv., Vodges, 1890, 



Vol. 63, p. 144. 

 Locality — Eau Claire. Wis. 

 Types — Univ. of Wisconsin. 



