REPORT OF THE STATE PALEONTOLOGIST 1902 1051 



between the first two plications being narrower than the three 



interspaces next succeeding. The seventh plication margins 



the cardinal slope, on which the eighth plication (corresponding 



to the interspace between the eighth and ninth plication of the 



pedicle valve) is undeveloped. 



A single specimen was obtained by the Columbia University 



field party from the upper Manlius of Mount Bob. The exact 



position of the specimen was not noted, but it probably belongs 



to the horizon of the upper Stromatopora beds of Becraft 



mountain. 



Whitfieldella cf. nitida Hall 



A single crushed specimen has the characters of the larger 

 individuals of this species. The greatest width appears to 

 have been below the middle, the shell in this respect approaching 

 W. intermedia in form. 



A consideration of this very meager fauna, which here occu- 

 pies the very summit bed of the Manlius, shows its affinity to 



be with the Cobleskill limestone 

 of Schoharie and the bullhead 

 waterlime of Buffalo. 1 That it 

 is a somewhat more advanced 



fauna than that of the Cobles- 

 Fig. 10 Whitfieldella of. nitida im • i, ~ -u xi, £ x. xi.„-l 



kill is shown by the fact that 

 the more specialized S. eriensis is the predominating type. 

 The affinity of the fauna with that of the Tentaculite beds of the 

 Manlius is shown by the occurrence of S. vanuxemi. 



Second and third Stromatopora beds. Two feet below the upper 

 Stromatopora bed is another about a foot thick but less con- 

 tinuous than the first. The intervening beds are rather shaly. 

 The Stromatoporas in this second bed are fragmentary, having 

 been broken and worn to some extent before they were 

 embedded. Where the Stromatopora fragments are wanting, 

 the rock is typical Manlius limestone with Leperditia 

 a 1 1 a . The Stromatopora appears to be the same as that in 

 the upper bed. 



1 Hartnagel has shown the probable equivalence and continuity of the latter 

 horizon with the Coralline or CobleskuTlimestone of eastern New York. (J. M. C.) 



