New Species of Devonian Fossils. 129 



Discussion: This species belongs to the group of S. punctuli- 

 fera, but is distinguished from that form by the fineness of its 

 striations and by being less strongly arcuate. 



The fine striations make it closely resemble vS". keyserensis of 

 the Keyser formation, but that older species is smaller, more 

 elongate, and has the hinge-line more extended. 



Occiirrence: Common in the Birdsong and Olive Hill forma- 

 tions at many localities in Benton and Decatur counties. 



Leptostrophia beckii tennesseensis, n. var. 

 Plate III, fig. 18 



Desa Iption: This fine large Leptostrophia is distinguished 

 from L. beckii only by the character of the corrugations which 

 ornament its surface. Instead of the fairly regular and even- 

 crested concentric corrugations of L. beckii, this variety is 

 marked by concentric ridges that are not only crooked but also 

 undulate in height. The result is the characteristic wavy or 

 "dimpled" surface shown in the figure. 



Occurrence: This variety is confined to the Birdsong shale, 

 and was found at Perryville and at other localities along Big 

 Lick and BirdsonsT creeks. 



FAMILY PRODUCTID^ 



Chonetes wadei, n. sp. 

 Plate II, fig. 14 



Description: Shell very minute, semi-circular, moderately con- 

 vex, more strongly arched toward the anterior margin than in 

 the umbonal region. Hinge-line straight and slightly longer 

 than the shell below. A cardinal spine about i mm. long and 

 directed slightly outward is located i mm. from the beak. 

 Another probably existed near the cardinal extremity. Surface 

 covered by exceedingly fine rounded striations, of which about 

 eleven occupy a space of 2 mm. About sixty may be counted 

 along the margin of the valve. Dorsal valve and interior 

 unknown. 



Dimensions: Length, 3.5 mm. ; width, 6 mm. ; convexity, 

 about 1.2 mm. 



