I96 NEW YORK STATE MUSEUM 



lines and coarse concentric wrinkles which are quite irregularly- 

 spaced. This description is based wholly on a left valve to which 

 it has seemed unsafe to refer any associated right valves. Though 

 there are ribbed Aviculopectens in all the formations here brought 

 under consideration I know none which agrees with or approaches- 

 this. 



Lozver Devonic. Moosehead lake, 7 miles north of Kineo, Me. 



Aviculopecten flammiger nov. 



This is a shell of somewhat variable exterior which approaches- 

 in outline the Pterinopecten proteus Clarke of the Be- 

 craft Mountain Oriskany [see N. Y. State Mus. Mem. 3, p. 32, 

 pi. 4, fig. 7], but it is unlike that in exterior. The round sub- 

 circular shell is strongly radiated, the primary radii being some- 

 times coarse with broad fascicles of intermediate striae, sometimes 



ecten flammige: 



finer and less distinctly fasciculate. In the number of these pri- 

 mary ribs there is the greatest variation. All are crossed by sharply 

 elevated concentric striae. The anterior wing is deeply sulcate and' 

 sinuous, the posterior relatively large and with concentric striae 

 only. Only left valves of this species have been observed and 

 they are readily recognized in spite of their variable ornament. 



Lozver Devonic. Askwith siding, Misery stream and Moose 

 river, Ale. 



Aviculopecten jumeaui nov. 



Shell of considerable size, suberect, explanate below, with sub- 

 orbicular outline tending to obliquity posteriorly. Beak anterior,, 

 anterior wing short, posterior broad flat or subconcave, the point 

 not extending beyond the posterior curve of the shell ; sharply 

 incurved on the lateral margin. Surface with fasciculate bands 

 somewhat after the type of ornament in Actinopteria tex- 

 tills; coarse distant ribs with intermediate smooth spaces divided. 



