SOME NEW DEVONIC FOSSILS 221 



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. 



Lower Devonic. Edmunds Hill and Presque Isle stream, Chap- 

 man Plantation, Me. 



Modiella modiola nov. 



This is a more elongate, more slender and generally larger shell 

 than M. pygmaea Hall, the posteriorly expanded and convex 

 body of the shell being narrower, the byssal sulcus less deep and 



Modiella modiola 



the anterior fold very much reduced in diameter. The shells are 

 thus subacuminate or modioloid and very obliquely arcuate. Aver- 

 age examples have a length of 18 to 24 mm. 

 Middle Devonic. Gaspe Basin, Gaspe. 



Grammysia modiomorphae nov. 



Shell large, elongate, generally with strong oblique medial de- 

 pression dividing the valves into two lobes, sometimes a low ridge 

 lying in the bottom of this depression ; beaks at the anterior one 

 third of the hinge, slightly elevated, appressed and incurved ; hinge 

 line direct, not elevated ; marginal outline incurved in front of the 

 beaks, rather narrow at the anterior extremity, broadly incurving 

 on the basal margin at the median sulcus, recurving in a broad 

 angle at the postlateral extremity. The median sulcus varies in 

 width and strength in different examples, at times being highly 

 and somewhat unequally developed on both valves, rather more 

 on the right and again being only a low, broad depression. 



Muscle scars obscure, only the anterior adductor being oc- 

 casionally shown on our specimens. Surface markings concentric 

 striae strongly marked at the anterior margin. 



The elongate form of this shell and its subequal extremities give 

 it the appearance of a Modiomorpha. The evidence seems to 

 indicate however that it is a Grammysia of unusual expression, 



