EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 229 



Euphemus ? quebecensis nov. 



Plate 17, figures it)-22 



To this well known Carbonic genus I refer with hesitancy flat or discoid, 

 involute, horizontally coiled shells having a goniatitic aspect, the final whorl 

 deeply overlapping the preceding and closing the umbilicus. The whorls 

 are narrow but deep, abruptly curved on the periphery ; the stoma expanded 

 but not explanate. The surface is marked by regular simple and continuous 

 elevated revolving lines which become crowded toward the aperture. There 

 is no evidence of a slit-band. The shell has a diameter of lo mm. 



This species represents a very unusual type of structure for a Devonic 

 bellerophontid but is provisionally placed in this association. 



Locality. Gaspe sandstone, Portage road, Gaspe Basin. 



Tropidocydus brevilineatus (Conrad) 



Plate 17, figures 7-16 



B e 1 1 e r o ]) h o n brevilineatus (Conrad) Hall. Palaeontology of New York. 

 1879. 5: 107, pt 2, pi. 26, fig. 5-7 



The shell identified by Hall with Conrad's description attains larger 

 size than T. rotalinea and is at once distinguished therefrom by the 

 sharply elevated retrally curved concentric striae which are not divided by a 

 slit-band. The trilobed expression of the exterior is better defined in the 

 sandstone specimens than in those from the shales of New York as are 

 likewise all exterior markings. The concentric lamellose lines are crossed 

 by fine interrupted revolving lines most distinct on the lateral lobes. 

 Comparison with the types of Hall's description leaves no doubt as to 

 identity to the finest details. 



Localities. Portage road, Gaspe Basin and in the Hamilton shales of 

 Norton's Landing, and Tichenor's Point, N. Y. 



Tropidocydus rotalinea (Hall) 



Plate 17, figures 3-6 



Bellerophon r o t a 1 i n e a Hall. Palaeontology of New York. 1879. v. 5, pt 2, 

 p. lis, pi. 26, fig. 8 



This little species, singularly and distinctly characterized by its highly 

 compressed and deeply trilobed surface, its projecting keel, carrying a slit- 

 band and its revolving elevated surface lines, is extraordinarily rare in the 

 Hamilton (Ludlowville) shales of New York, the type specimen being the 

 only example known, but in the Gaspe sandstone it is one of the commoner 

 gastropods. It differs herein nowise from the New York species even in 

 size. 



Locality. Gaspe sandstones. Portage road, Gaspe Basin ; and in the 

 Hamilton shales at Norton's Landing, Cayuga lake, N. Y. 



