204 NEW YORK STATE MUSEUM 



anterior ear smooth, but on the posterior slope they are continued 

 to the hinge. The posterior wing is cancellated and the cardinal 

 line more strongly striate. The left valve which is less convex 

 than the other has the radial riblets developed only on the median 

 area, both anterior and posterior wings being smooth save on the 



i 



Pterinea edmundi 



posterior hinge where is a cancellated group of three or four strong 

 radii. The variations in the outline of this species reach an extreme 

 in the variety subrecta, which retains the same style of orna- 

 ment as the foregoing and relative proportions and development 

 of the parts, but is quite erect. This appears to be a persistent 

 feature which we find exemplified in several examples. 



Lower Devonic. Edmunds Hill, Chapman Plantation, Me. 



Pterinea cf. fasciculata Goldfuss 



Pterinea fasciculata Goldfuss. Petrefacta Germaniae, 2 :i37, 



pi. 129, fig. 5 

 Pterinea fasciculata Freeh. Devon. Aviculiden Deutschlands 



1891. p. 84, pi. 8, fig. 1 ; pi. 9, fig. 1-3 



This species is radially and coarsely ribbed, quite convex and 

 •oblique along the crescence line, the anterior wing strongly 



Pterinea cf. fasciculata Goldfuss 



■developed on the abrupt anterior slope and the hinge teeth both 

 beneath the beak and behind it very pronounced. It is very 



