SOME NEW DEVON IC FOSSILS 



195 



figure drawn from a sculpture cast, displaying the sharp concentric 

 growth lines which are crowded together on the infolded part of 

 the test. The length is 28 mm and the anterior width 19 mm. 

 In the Devon ic of the Appalachian gulf no chitons have been 



Probolaeum 



canadense 



found, though these bodies are knowm from several horizons in 

 the transatlantic Devonic. There is noteworthy similarity in the 

 form and aspect of P. canadense to Chiton sagittalis 

 Sandberger (Stringocephalus limestone). 1 



Lozver Devonic. St. xAdban beds, Cape Rosier Cove, P. O. 



PELECYPODS 



Aviculopecten alcis nov. 



Shell slightly oblique with anterior beak and short anterior wing. 

 Hinge and posterior wing not extending as far back as the shell 



A v i c ul o p 



alcis 



outline. Curvature of the margin gently convex in front and 

 anterolateral^,- narrowed and slightly produced behind. Body of 

 the shell gently convex; length and hight equal. Surface covered 

 by fine radial riblets of unequal size, close together, generally with 

 some tendency to fasciculation behind, fine and fainter and closely 

 crowded in front. These are all crossed bv verv fine concentric 



Verstein. rhein. Schichtensys. p. 239, pi. 26, fig. 2; 



