EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA I 75 



Localities. Occasionally in the limestones about Grande Greve. V^ery 

 abundant at Perce. Very common in the Gaspe sandstones at Gaspe Basin. 



Coelospira concava Hall 



Plate 29, figures 19-22 



Leptocoelia concava Hall. Palaeontology of New York. 1859. 3:245, 



pi. 38, fig. 1-7 

 Coelospira concava Clarke. N. Y. State Mus. Mem. 3. 1900. p. 42, pi. 5, 



fig. 23-26 



This species is rare, only a few specimens of the valves having been 

 found among the etchings. It is a common form in the Helderbergian 

 fauna of New York and likewise in the Oriskany of Becraft mountain and 

 Glenerie. 



Locality. Grande Gr^ve. 



Nudeospira cf. ventricosa Hall 



See Palaeontology of New York. 1859. 3: 220, pi. 14, fig. i; pi. 28B, fig. 2-9 



This is one of the rarest of the brachiopods of the fauna and has been 

 observed only in imperfect specimens. Nudeospira ventricosa is 

 a species of the Helderbergian fauna of New York and Maryland. 



Localities. In the middle limestones at Grand Greve. 



Rhynchospira or Retzia 



A single specimen shows the presence in the fauna of spire-bearers 

 of this type, the example in hand having a noticeable similarity to 

 Rhynchospira formosa Hall of the Helderbergian. 



Locality. Grande Greve. 



Meristella champlaini nov. 



Plate 30, ligures 1-20 



Prob. Athyris laevis Billings. Logan's Geology of Canada. 1863. p. 393 

 Athyris (Merista) arcuata Billings. Palaeozoic Fossils. 1874. v. i, pt 2, 

 pi. 3, fig. 9, a, b 



Specimens of Meristella are among the commonest fossils in the 

 Grande Greve limestones. Adult forms share with immature individuals a 

 well defined habit which can be readily expressed in words but not so readily 

 discriminated from the known characters of one and another of the many 

 species of the genus which have already been described from the faunas of 

 about this age. We can not fully identify the commonest of these shells 

 occurring on the Forillon with any of the described species but can express 

 the differentials best in terms of such species. 



