SOME NEW DEVON" IC FOSSILS 



207 



r i g m a g e n s i s Freeh, from the Coblentzian, A. reticulata 

 Sowerby, from the Aymestry limestone, but such comparisons are 

 resemblances only in one or another feature. Xo closely allied 

 form is now recognized. 



Lower Devonic. Dalhousie. N. B. 



Pterinea radialis now 



This is one of a group with an Actinopterialike exterior, but it 

 has the highly developed anterior muscle scar, the umbonal and 

 the lateral teeth of Pterinea. Xo attempts therefore at correlation 

 with species which have been determined as Actinopteria and 

 Avicula are here called for. The shells have the size and propor- 





Pterine 



radialis 



'Upper figures the usual form at Chapman Plantation; lower figures exemplify the larger size 

 attained at Matagamon lake. 



tions of the foregoing (P. cf. fasciculata) and the following 



species. The hinge line is but slightly extended posteriorly, the 

 anterior wing well marked, convex and sulcated ; the crescence 

 line oblique and the valve highly convex in the umbonal region, 

 with abrupt anterior and more gradual posterior slope. The sur- 



