831 



Ptycho. 



plate 16, figs. 1, 2, fish found in the brown sandstone quarries 

 at Durham, Conn., fig. 2a, enlarged scales. Irias. 



Ptychoparia adamsi. {GonocephaUtes adamsi^ Billings^ 



U\X. ^ ^'^ pI 26 IS^l^Greo. yt., fig.355; PaL 



" Foss. I. fig. 15. Geo. Can.^ 



1863, fig. 294. Gonocepha- 

 Utes arenosus Billings, Geo. 

 Vt, fig. 358; Pal. Foss. fig. 

 18; Geol. Can., fig. 297). 

 Walcott, Bulletin No. 30, 

 U. S. G. S. page 195, plate 

 26, fig. 1, head from '' Red 

 --. Rock," east of Highgate 

 springs, Vt., figs, la^ 15, narrow and broad forms of head from 

 limestone formation, 2 m. E. of Swanton, Vt. Fig. 1 c, nearly 

 entire specimen from Paiker's quarry, Georgia, Vt. Lower 

 Cambrian ( Oeorgian) formation, Z. G. 



Ptvchoparia calcifera. Walcott. Potsdam Fauna, Sara- 



U C gSS^-f I ^^^^ ^^"> ^' ^•' "^^^^' ^S- ^- ^^"^ ^^^^' ^^' ^' 

 * ■ ' '^ S.G.S. page 62. U.O. Upper Cambrian (Pots- 



dam) formation. To be sought in Pennsyl- 

 vania along the South Mtns, and Chester 

 Valley. Potsdam, /. 



WaL i !8e8 



Ptychoparia emmriclii, Corda's second type of the genus 

 J* T ^ in Europe; Walcott, Bulletin No. 10, U. S. G. S^ 

 ' — pages 13, 14, 35, 37, plate 6, fig. 7, copied from 



Barrande, to discuss the genus Ptychoparia. 



Ptychoparia cordiUera, Rominger, Proc. Acad. N. S. Phila. 

 Jan. 1887, p. 17, pi. 1, f. 7, has 19 segments in its thorax, like 

 Ptychoparia piochense ( Walcott), but a head more like Pticho- 

 paria kingi (Meek). It was found among the Mt. Stevens^ 



