EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA IO/ 



cognata' is very close in all visible features save that the crescence ridge 

 in the latter is somewhat sharper. It may also be compared to M. e 1 e v a t a 

 Krantz of the lower Coblentzian.' Professor Kayser suggests a similarity 

 with M. siege n en sis Beushausen. ' At all events the short obliquely 

 cordate shell is not familiar in Appalachian faunas of this age. 

 Locality. Edmunds Hill. 



Modiomorpha protea Clarke 



Plate 26, figures 4-8; plate 27, figure 7 



Modiomorpha protea Clarke. N. Y. State Mus. Bui. 107. 1907. p. 220 



Shell elongate, subrhomboidal, beaks anterior, posterior hinge not ele- 

 vated, crescence line high, relatively approximate to hinge. Length and 

 hight as four to three. Anterior margin broadly rounded, not narrow, basal 

 margin sloping gently downward to near the umbonal ridge, thence bending 

 up and back in a broad angle ; posterior hinge angle rounded. Umbonal 

 ridge subangular, sharply defined by the rapid slope of the surface toward 

 the hinge, but not elevated above the general convexity of the sides of the 

 valves. 



Anterior adductor scar with the little foot muscle scar well defined. 



This species is somewhat variable in outline, some of the specimens 

 assigned thereto being considerably larger than others. This variation, 

 however, is not expressed in the typical specimens at Edmunds Hill as well 

 as in the examples referred to the same species occurring at Presque Isle 

 stream. 



Localities. Edmunds Hill and Presque Isle stream. 



Modiomorpha sp. 



Plate 27, rigure 10 



A single internal cast represents a form of this genus with narrowed 

 anterior extremity and comparable to M. cymbula Hall of the Ithaca 

 group of New York 4 and such shells as M . modiola Beushausen of 

 the Coblentzian. 5 



Locality. Edmunds Hill. 



1 Fauna d. Untercoblentzsch. 1902. p. 88, pi. 10, fig. 15, 16. 



2 Beushausen. Lamell. d. rhein. Devons. p. 23, pi. 2, fig. 9— 11. 



3 op. cit. p. 24, pi. 2, fig. 8. 



•* Pal. N. Y. v. 5, pt 1, p.282, pi. 36, fig. 19, 20. 

 sLamellibr. rhein. Dev. p. 22, pi. 2, fig. 1-5. 



