EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA I 77 



N, Y. State Mus. Mem. 3, 1900, p. 45, pi. 6, fig. 12-14) comprises large 

 shells with the proportions of M. lata but having the pedicle scar greatly 

 developed and bounded by high dental plates, and the large adductor scar 

 common to all these species obscured almost to obliteration by the pallial 

 ridges and sinuses. The latter are here much more highly developed than 

 in M. champlaini where the muscle scar suffers no obscuration 

 therefrom. 



M e r i s t e 1 1 a champlaini is the designation which, in view of the 

 peculiarities mentioned, we propose for this Grande Greve shell. It serves 

 to express the fact that these shells share the features of a series of essen- 

 tially contemporaneous forms in the American province and at the same 

 time combines these in such a way that, considered ontogenetically, it is 

 always distinguishable from them, while on the whole most nearly allied to 

 the later expressions in the Oriskany sandstone. 



Localities. At nearly all the higher outcrops along the coast at Grande 

 Gr^ve and Indian Cove. 



Species name. Samuel Champlain. 



Meristella lata Hall {op. cit.^ 



Plate 30, figures 21-26 



Very rarely among the Meristellas at Grande Greve but abundantly at 

 Perce occur shells characterized by their broad backed, depressed ventral 

 valves, with low broad umbo incurved at the beak, sharply defined cardinal 

 ridges below which the surface is concave to the hinge. These are in com- 

 plete agreement with the Oriskany species M. lata except as to size. At 

 Perce the individuals are uniformly small, but the same type is larger on 

 the Forillon. 



Localities. Rare at Grande Greve and Indian Cove; common in 

 Perce rock. 



Spirifer murchisoni Castelnau 



Plate 32, figures i-io 



Spirifer murchisoni Castelnau. Essai sur le syst. silur.de I'Amer. septentr. 



.1843. p. 41, pl. 12, fig. I, 2 

 Spirifer ar rectus Hall. Palaeontology of New York. 1859. 3:422, pl. 97, 



fig. I, 2 

 Spirifer murchisoni Clarke. N. Y. State Mus. Mem. 3. 1901. p. 46, pl. 6, 



fig. 26-30 



This species, everywhere abundant in Oriskany outcrop.s, is the com- 

 monest of the Spirifers in the Gaspe limestones. There are no essential 

 particulars in Avhich the shell differs from its expression in the more 

 southerly formation but at the same time there are two pretty well defined 

 differences evident. The more prevalent of these are displayed in shells 



