SOME NEW DEVONIC FOSSILS 227 



the valves obliquely backward though without greatly affecting 

 the regularity of the basal margin. Umbonal ridge sharply devel- 

 oped, not crested ; extending to the postlateral angle. Postum- 

 bonal slope broad and concave, its outer edge constituting the 

 entire posterior margin of the valve which slopes forward to the 

 hinge. This concave area is traversed by an obscure radial ridge. 

 Surface of the valves covered with fine concentric striae in low 

 and irregular undulations over the shell body ; these however are 

 absent on the posterior slopes where sharp concentric lines alone 

 are visible. Length about one third the hight. 

 Lower Devonic. Dalhousie, N. B. 



Carydium elongatum nov. 



This is distinguished from its associate C. gregarium Beus- 

 hausen by its longer and narrow valves which are quite regularly 

 convex from a transverse median line, the surface sloping thence 

 uniformly above and below, leaving the umbones depressed. The 



Carydium elongatum 



anterior end is visibly narrower than the posterior though the latter 

 is not greatly expanded. The beaks are situated about one third 

 the hinge length from the anterior end and the region in front of the 

 beaks is somewhat excavated. The hight of the shell is about one 

 third of the length. The surface is covered by concentric lines only. 

 Lower Devonic. Dalhousie, N. B. 



Cypricardella norumbegae nov. 



Shell short, subrectangular, broader behind than in front, beaks 

 well forward, umbones prominent, umbonal ridge well developed 

 and dividing the valves so as to leave a broad postumbonal slope 

 which is slightly depressed or concave. Hinge line short, not 

 extended in front. Shell margin curving from a broad anterior 

 extremity with an outward bend into the basal margin which 

 becomes direct near the umbonal ridge where it turns sharply 



