130 Carl O. Dunbar, 



Discussion: This little shell seems to be closest to C. siibaciiti- 

 radiatiis from the New Scotland of Maryland, from which it 

 differs in being less arcuate, proportionately wider, and in hav- 

 ing about twice as many striations and these correspondingly 

 finer. 



Occurrence: A single well preserved specimen was found near 

 the center of the Bear Branch member of the Olive Hill forma- 

 tion at Olive Hill. 



Name: Named after the writer's friend. Doctor Bruce Wade, 

 who directed him to many localities in the southern part of the 

 Tennessee valley. 



Chonetes fornacula, n. sp. 



Plate H, fig. 25 



Description: Shell minute, very strongly convex, longitudinally 

 semi-elliptical in outline. Greatest width at the hinge-line, 

 below which the sides are very slightly constricted, converging 

 gently to the more sharply rounded anterior margin. Umbo of 

 the ventral valve very gibbous, overarching the hinge-line. 

 Curvature about uniform from beak to anterior margin along 

 the median line, but sharper from the middle of the valve toward 

 the lateral margins and then flattening out near the slightly 

 extended cardinal extremities. Surface covered by relatively 

 coarse angular striae which increase by intercalation. About 

 fourteen striae may be covmted around the margin of a specimen 

 4 mm. wide. Cardinal spines not known. 



Dimensions: Length, 4 mm.; width, 4 mm.; height. 2 mm. 



Discussion: This minute Chonetes belongs to a group of small, 

 arcuate, coarsely striated forms which includes C. billingsi. C. 

 mucronatus, C. laticosta and C. higlilandensis. The Camden 

 chert species is smaller, proportionately longer, and more strongly 

 arched than any of these forms. It most closely resembles C. 

 laticosta of the Corniferous, but in addition to the differences 

 noted above, that species is less constricted in front of the hinge- 

 line. 



Occurrence: Rare in the Camden chert, in the vicinity of 

 Camden. 



