843 



Ptyo. 



eyes set apart a distance | their length ; very thin head bones. 

 The other shows two slender rather long hind legs; animal 

 probably had no fore limbs. Coal measures. XIII. 



Ptyonius pectiuatus, {Sawropleura pectinata^ Proc. Acad. 



faiOliti). 





FLY%vvh f,4 



Nat. Sc. Philada., 1868.3 Pal. Ohio, Vol. 2, 1875, page 377, 

 plate 27, fig. 7, twice natural size ; plate 28, figs. 2,4,6, natural 

 size ; plate 29, fig. 2, and plate 30, fig. 2, twice natural size ; 

 plate 35, figs. 1, 2, 3, and plate 40, fig. 1, natural size. At 

 least eight well defined specimens were collected at first, and 



