EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 1 09 



limits customary to the Pen tamer us gal eat us of the Coeymans 

 limestone of New York. 



Locality. Common in the lower division at Cape Rosier Cove. 

 Billing-s cites it from division i. 



Atrypa reticularis Linne (sp.) 



The expression of this species in the Helderbergian of New York is 

 quite decided and peculiar. The shell is always of medium size, compact, 

 with valves devoid of fringes and lamellae, rather elongate in outline with 

 a distinctly projecting ventral beak. This style of the species is impressed 

 pretty constantly on all its examples. The same expression is maintained 

 by specimens from the lower beds of Cape Rosier Cove. 



Rhynchospira Formosa Hall 

 R h y n c h o s p i r a f o r m o s a Hall. Palaeontology of New York. 3 : 485, pi. 36, f. 2 



A single very characteristic specimen of this Helderberg species has 

 been found at Cape Rosier Cove. 



Rhynchospira globosa Hall 



Plate 39, figures 14—17 



Waldheima globosa Hall. An. Rep't State Cab. Nat. Hist. 1856. p. 47 

 Trematospira globosa Hall. Palaeontology of New York. 1859. 3:215, 



pt 36, fig. I, a-p 

 Rhynchospira globosa Hall & Clarke. Palaeontology of New York. 1894. 



V. 8, pt 2, p. 109 



This species occurs, though not commonly, in the New Scotland beds 

 of New York. Specimens from Cape Rosier Cove, lower beds, agree with 

 New York examples. 



Atrypina imbricata Hall 



Leptocoelia imbricata Hall. Palaeontology of New York. 3:246, pi. 38, 



Atrypina imbricata Hall & Clarke, tf/. <://. v. 8, pt 2, pi. 53, f. 5-10 

 This little shell is present at Cape Rosier Cove. 



Atrypina sp. ? 



Plate 29, figure i8 



We figure a specimen from the Grande Cavee showing the dorsal valve 

 of a large and highly lamellose shell of the expression of A. imbricata 

 of the Helderbergian fauna but without plications. 



