SOME NEW DEVOXIC FOSSILS 225 



ridges for every one on the anterior surface. Median surface 

 slightly depressed. 



Lower Devonic. Presque Isle stream, Chapman Plantation, Me. 



Leptodomus prunus nov. 

 Elongate shells with anterior umbones and low cincture most 

 distinct at the beaks. Surface quite evenly convex though the 

 beaks are depressed. Umbonal ridge broad and ill defined. Orna- 

 ment consisting of concentric ridges, sharp in the umbonal region 



Leptodomus prunus 



and with closely crowded concentric lines between all, becoming 

 obscure toward the margins. Length of each valve about twice 

 the hight. 



This species is distinguished from L. canadensis Billings 

 of the Grande Greve limestone by its shallower cincture but fur- 

 ther knowledge of the species may show its very close relationship 

 to L. s t r i a t u 1 u s F. Roemer of the upper Coblentzian. [For 

 figures of the latter see Beushausen. op. cit. p. 265, pi. 24, fig. 

 12-14] 



Lower Devonic. Telos lake, Blind Cove Point, Me. 



Goniophora curvata nov. 



Shell of medium size, elongate, hinge line usually concealed, but 

 apparently short, not extending posteriorly to within one third 

 of the shell's length of the end. Beaks anterior, subterminal, valve 

 slightly excavated in front beneath them, making the anterior ex- 

 tremity relatively narrow. The umbonal ridge is obliquely curved 

 and lies high on the valves making the postumbonal slope narrow. 



The specimens of this shell are not common and it would seem 

 the width of the postumbonal slope and the position of the ridge 



