Petal. 



62G 



Fossiliferous limestone (250' beneath Pittsburgh Coal) in 

 Fayette Co. L, p. 36. Barren measures. XI V* 



Petalorhynchus distortus, N. & W. Geol. 111. Vol. 6, 



Xr. va.. n. K7C aa. av .li) 1875, page 406, plate 



Geo\ 

 5li. 



12, fig. 7 j^, convex 

 ^"^ ^^T ^ face of medium sized 

 v^*- ^'- ' ^IS^ fish-tooth ; J, concave 



face showing deeply arched basal margin ; <?, profile section ; 

 8, a^ 5, (?, a smaller specimen. /(^j{. Z^jt^i^ limestone leds. XL 



Petalorhynchus pseudosagrittatus, ^St. John, and Wor- 



y^\^ 



lb. ic 



ca. 



SealJlhVol.6,xiu 



then, Pal. Illinois, Vol. 6, page 405, plate 12, figs. 1 6K, 6, c, small 

 fish-tooth, convex, concave faces, section ; a, J, o, large tooth, 

 ditto ; 3 a^ outline of convex face of very large pointed tooth, 

 with forked root ; 4 a^ medium tooth. St, Louis. XL 



Petalorhynchus spatulatus, St. John and Worthen, GeoL 



X/ -'M^y^ ^^^ il' J>^ fi Illinois, 



Vol. 6, 

 1875, 

 page 

 408, 



plate 12. fig. 5 ^, convex side of large j swollen fish-tooth with 

 swollen point; J, side view , 6 a^ convex face, J, concave face, 

 c, profile section, of small tooth. St. Louis limestone^ XL 

 Petalorhynchus (Petalodus) striatus, New. and Worthen, 



Geol. Sur. Illinois, Vol. 2, 1866, 

 page 40, plate 2, fig. 8, back view; 

 8 a, front view, natural size^ of 

 this unique and pretty species, re- 

 jfjjr^ c^f^T^^ ^mny^ sembling distantly P. sagittatus^ 



Agassiz. Burlington, XL, 

 Petrabliattina sequa, Scudder. A hexopod insect from 

 near Fairplay Colorado. Proc. Acad. N.S. Phil., 1885, p. 38- 

 — Trias. 



