833 



Ptycho. 



Ptychoparia orestes. var. thersites. {Conocephalites 

 thersites^ Hartt, Acad. Geol. p. 653.) Wal- 

 cott. Bulletin No. 10, U. S. G. S. page 40, plate 

 45, fig. 2, type of C. thersytes^ enlarged twiee. 

 Lower Cambrian {St. John) formation^ New 

 Brunswick. Z. C. 



Ptychoparia ouangondiana and variety aurora ( Cono- 



%m0\Jt 



eepha- 



lites on- 



angon- 



diana^ 



Hartt, 



1868, 



Acad. 



Geol. 



Dawson, 



2d ed. p. 



651,654.) 



Walcott, 



Bulletin No. 10, U. S. G. S. page 37, 38, plate 5, fig. 4, X 3, 

 frontal furrow nearly obsolete; 45, distorted,'; 4(?, x 3, young 

 head in proper shape ; 46?, 4/1, 4c, x 2, type, distorted. Plate 5, 

 fig.. 5, X 2, type of Hartt's aurora L. C* 



Ptychoparia piochensis, Walcott. Z. t7. 



Ptychoparia ? prospectensis, Walcott. L, C. 



tychoparia quadrans, Hall & Worthen. Z. C. 



Ptychoparia quadrata. {Conocephalites quadrata^ Hartt. 

 Acad. Geol. Dawson 2d ed. p. 654.) Walcott, Bull. 



\^^'^ 10, U. S. G. S. page 39, plate 5, fig. 1, enlarged 

 i twice., type. Lower Cambrian {Saint John) for- 

 mation^ New Brunswick, Z. C. 



Ptychoparia robbi. Hartt. {Conocephalites formosus^ 



LC 



Hartt, 1868, Acad. Geol* 

 Dawson, 2d ed. pp. 648, 

 654.) Walcott Bull. 10, 

 U. S. G. S. page 36, plate 

 6, fig. 5, enlarged tvnce^ 



