CLINTON GROITP. 



93 



Fig. 8 a. Dorsal view of an imperfect specimen. 



Fig. 8 i. A portion of the same enlarged, showing the elevated decussating striae, and another 



portion where these are obliterated by abrasion or exfoliation. 

 Fig. 8 c. Dorsal view of a cast of this species, with the aperture and a part of the last volution 



broken off. 

 Fig. 8 d. Lateral view of the same specimen. 

 Fig. 8 e. Transverse section of the last volution, where broken off. 



Position and locality. This fossil has been found only at Lockport in the chert of the 

 lower limestone bed, and but a few feet above the Medina sandstone. 



(Collection of Col. Jewett.) 



488. 9. BUCANIA? BELLA-PUNCTA (?i. sp.). 



Pl. XXVIII. Fig. 9. 



Last volution rapidly expanding from a small spire ; apex or inner volutions unknown ; 

 surface marked by small punctures arranged in longitudinal series ; form of aperture not 

 ascertained. 



In two specimens examined, the back of the outer volution only is visible, the apex or 

 smaller extremity is incurved, but the number or extent of the volutions is uncertain. The 

 marking on the surface is very peculiar ; but there is no carina, which usually marks species 

 of this genus. 



Position and locality. In the dark shale below the iron ore bed in Wolcott, Wayne county. 



396. 7. BUCANIA TRILOBATA. 



Pl. XX VIII. Fig. 10 a, h. 

 Reference, £. trilobatus, page 13 this volume. 

 This species, which occurs in the Medina sandstone at Medina, appears again in the ferru- 

 ginous shaly sandstones between the ore beds, and also in a lower position, associated with 

 Avicula rhomboidea. A single specimen shows that it attains a large size, though the smaller 

 figure is of the usual size of this species, both as it occurs here and in the Medina sandstone. 

 It is impossible to ascertain what were the original surface markings, since all the specimens 

 seen, either in the Medina sandstone or Clinton group, are casts preserving no remains of the 

 original shell. 



Fig. 9 a. A specimen, natural size. 



Fig. 9 J. A large individual, much compressed in a longitudinal direction. 



Position and localities. This species occurs in the central and lower part of the group in 

 the several exposures in the neighborhood of Blackstone's and Wadsworth's quarries, New- 

 Hartford, Oneida county. 



