36 BULLETIN OF THE LABORATORIES 



Clionetes scitula. Hall. 

 (Plate I, Fig. 4.) No. 1397. 



Shell small, semi-oval, hinge-line about equal to greatest width, 

 tumid along the medial line. Ventral valve, moderately convex along 

 a line from the beak to the front margin, about one-third the entire 

 width, thus elevated near the front, lateral margins depressed; beak 

 slightly prominent, hinge-line somewhat angled, armed at either ex- 

 tremity with at least two spines. Surface marked by fine but rather 

 prominent, distant stri?e which do not bifurcate, sometimes somewhat 

 alternate. Width about 8 mm, height 5 mm. Dorsal valve nearly 

 plane. Near the base of the series at Moot's run, probably 50-60 feet 

 below congl. I. 



Our specimens agree even to details of hinge structure with 

 those of New York. The spines are strong and oblique. 



Another form found near congl. II, or about 80 feet above the 

 present species, resembles this in form, but has more numerous bifur- 

 cating stride. This we compared with C. setigera, H., but though 

 closely agreeing otherwise, our species has oblique spines on the hinge. 



Clionetes tinnidus, sp. n. 

 (Plate II, Fig. 21.) 



Shell of medium size, closely resembling C. acutiradiata of the 

 Corniferous group of New York. 



Ventral valve very convex (as much so as C. hemispherica of the 

 Upper Helderberg), hinge extended, with mucronat^ extremities, 

 straight, apparently with few oblique spines; body of the shell nearly 

 semi-circular, forming nearly a segment of a sphere, being suddenly 

 depressed to the flat ears, which are acutely triangular. Umbo some- 

 what prominent. Surface marked by numerous (50), regular, nearly 

 continuous, rounded striae, which rarely bifurcate. Exfoliated speci- 

 mens show numerous oval pores between the stride. Dorsal valve not 

 known. This very pretty species is found in the irregular calcareous 

 nodules at base of the section at Moot's run and adds a significant 

 Devonian color to the facies. The resemblance to C. hemispherica is 

 close, but the outline is as in C. acutiradiata, H. 



Width 12 mm, height 7 mm. 



