EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 1 63 



characters in the Gaspe limestones, though it here appears to be a rare 

 form. 



Locality. Grande Gr^ve. 



BRACHIOPODA 



Centronella glansfagea Hall 



Plate 25, figures 1-4 



R h y n c h o n e 1 1 a g 1 a n s f a g e a Hall. N. Y. State Cab. Nat. Hist. 10th An. Rep't. 



1857- p. 125, fig. 1-6 

 Centronella glansfagea Hall. Palaeontology of New York. 1867. 4:399, 



pi. 61A, fig. 1-21, 25, 26 

 Centronella glansfagea Hall & Clarke. Palaeontology of New York. 1894. 



V. 8, pt 2, p. 268, fig. 180, pi. 79, fig. 1-14, 17, 21 



A few specimens of this species have been found in the limestones of 

 Grande Greve and show the characteristics both of exterior and interior. 

 The species is common in the Onondaga limestone of New York and else- 

 where and has been reported by Schuchert from the Oriskany (Decewville 

 beds) of Ontario where these two faunas are commingled. 



The presence of this species in the Grande Greve fauna and the 

 absence of the genus Oriskania which is so characteristic a member of the 

 Glenerie and Becraft Oriskany leads us to note that while externally the 

 difference in these shells is chiefly one of size, both sharing the boat shaped 

 contour with arched and medially elevated ventral and flat or medially con- 

 cave dorsal valve, there are more essential internal distinctions. Oriskania 

 is progressed in many features of structure in its large and divided cardinal 

 process and the thickening of other parts which are a concomitant both of 

 individual and racial age, and there is a further distinction in the form of 

 the loop, in Oriskania the descending branches being broader and blade 

 like, approaching closely (so far as we have been able to make out from 

 silicified specimens) the brachial apparatus of Megalanteris and Beachia. 



Cryptonella (?) ellsi nov. 



Plate 25, figures 8-10 



This is a much more elongate shell than the preceding with relatively 

 slender and projecting umbones and sloping cardinal margins. The beak 

 of the ventral valve is arched but not incurved, the lateral slopes broad and 

 excavated, bounded without by long cardinal ridges extending one half the 

 length of the shell. The valves are about subequally convex but the 

 ventral valve is flattened toward the anterior margin. Width of valve to 

 length as 2 to 3. 



Rare at Grande Greve. 



Species name. Dr R. W. Ells, experienced expositor of the geology 

 of Gaspe. 



