236 NEW YORK STATE MUSEUM 



This Species belongs to the group of S. murchisoni but its differ- 

 entials are pretty well defined. It is a shell more extended on the hinge 

 with more abundant closer and sharper plication, sharper fold and sinus and 

 in respect to surface ornament it has distant and very sharp varices which 

 are fringed with fimbriae. The shell may be compared in respect to form 

 and number of plications with S. s u b m u c r o n at u s Hall and S. 

 cumberlandiae Hall from the Oriskany of Maryland, but it differs 

 from both in sharpness of plication, fold and sinus and in the surface details. 

 Sinus and fold are persistently free of plication or furrow. On a careful 

 study of all the forms pertaining to this group, S. gaspensis will doubt- 

 less be found a clearly defined expression of the type of structure, one 

 which maintains its characteristics with pertinacity. I find associated with 

 shells having the foregoing characters other Spirifers generally of larger 

 size and in which the plications are much flatter and apparently smooth 

 though not differing materially in number. These present a different 

 aspect to that ofS. gaspensis but it is quite possible that they are 

 waterworn shells. 



Localities. Billings stated that the species is very abundant in the 

 Gaspe sandstone, Gaspe Bay, and also quoted it from Split Rock, Perce. 

 We have found it common at most outcrops of the sandstone at and near 

 Gaspe Basin, but the Perce shell which Billings identified with it, is 

 doubtless S. murchisoni. 



Cyrtina hamiltonensis Hall 



Cyrtina hamiltonensis Hall. Palaeontology of New York, 4: 268, pi. 27, fig. 

 1-4; pi. 44, fig. 26-33, 38-S2 



A single indubitable specimen of the common Hamilton shale species 

 has been observed at the Portage road. 



Athyris hera nov, 



Plate 34, figures 13, 14 



The sandstones at Gaspe Basin afforded casts of ventral valves, one of 

 them of noteworthy size, of subcircular outline, considerably arched at the 

 umbo but depressed on the slopes, and with a narrow deep and evenly 

 rounded median sinus ; the surface of the valve bears only the concentric 

 lines of growth and with very fine radial striae visible only in the sinus. 

 The valve has a length and width of 45 mm. 



The larger specimen suggests a Spirifer allied to the rare type of S. 

 1 a e V i s of the Ithaca (Portage) fauna of New York, though more orbicular 

 and with more pronounced sinus. That species has been regarded as a 

 fimbriated shell, but the fine radial lines of this specimen have less the 



