EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA l8l 



than S. eye lop terns, while the latter differs from S. fimbriatus 

 ehiefly in respeet to the sharpness of plieation and probably also in the 

 eharacter of fimbriation for in S. fimbriatus the spinules are double. 

 The Gaspe speeimens are in harmony with the Glenerie Oriskany specimens 

 in respeet to degree of plieation. 



Localities. Grande Greve, Indian Cove and Peree. 



Spirifer raricosta (Conrad) 



Plate 32, figures 22, 23 



Delthyris raricosta Conrad. Acad. Nat. Sci. Phila. Jour. 1842. 8:262, pi. 



14, fig. i8 

 Spirifer raricosta Hall. Palaeontology of New York. 1867. 4: 192, pi. 27, 



fig- 30-34; pl- 30, fig- ^-9 

 Spirifer raricosta Billings. Palaeozoic Fossils, op.ctt. p. 47, i)l. 3A, fig. 5 a-b 



This species in the Appalachian province pertains to the Schoharie 

 grit and Onondaga limestone. At Grande Greve it is rare and I have seen 

 only the speeimens figured by Mr Billings, which are quite typical in the 

 sparse and coarse plications though nothing is left of the surface ornament. 

 The contour of the shell is qualified by compression. The species may be 

 regarded as very rare in this fauna. 



Spirifer plicatus (Weller) 



Plate 31, figures 1-17 



Metaplasia plicata Weller. Geol. Sur. N. J. Rep't on Paleontol. v. 3; The 

 Paleozoic Faunas. 1903. p. 356, ])1. 48, fig. 7-12 



This species described by Dr Weller from his locality 6 A in the 

 Oriskany \op. cit. p. 97] near Montague postoffiee not far from the New 

 York State line, is of small size with depressed dorsal valve and highly 

 arched pedicle valve. The ribs are sparse and of those on the pedicle 

 valve the two bounding the rather narrow median sinus are specially promi- 

 nent and with them the lateral ribs are strongly contrasted in size. The 

 lateral ribs may be, on each side of the sinus, two with trace of a third, or 

 three with trace of a fourth ; these ribs are erect, the furrows broad and 

 sharply defined. Occasionally there is a strong rib in the bottom of the 

 sinus, especially in the specimens from Perce. On the dorsal valve 

 the median fold is very much depressed and may even be grooved medially 

 and the three 01 four lateral plications are likewise broad and rather flat, 

 contrasting somewhat to those of the opposite valve. The exterior of this 

 valve is strikingly like that, of some Cyrtinas. Interiorly neither valve 

 bears septa and the usual cardinal processes are normally developed for the 

 genus. The surface of ribs and furrows bears extremely fine concentric 

 lines which are not fimbriate. 



