EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 87 



Chonostrophia dawsoni Billings 



Plate 20, figures 30-33 

 See pt i, p. 240 



Comparison of the figures here given with those of C . dawsoni 

 from the Gaspe sandstone and with C. complanata Hall will show 

 clearly enough the similarity of these shells with the larger and broader 

 forms which we recognize as pertaining to the former species. The shells 

 under consideration have suffered slight distortion at times but this is in 

 nowise such as to conceal their specific character. 



Localities. Misery stream, first dam in town of Sandwich ; 7 miles 

 north of Kineo, Moosehead lake. 



Orthothetes (Schuchertella) woolworthanus Hall 



See pt i, p. 112 



Some of the examples of this shell show the elongated form which has 

 been rarely observed outside of the New York Helclerbergian. [See Palae- 

 ontology of New York, v. 3, pi. 17, fig. li, im, 10, 2b] 



Locality. Blind Cove point, Telos lake. 



Leptaena rhomboidalis (Wilckens) van ventricosa Hall 



Plate 21, figure 17 



This very characteristic Oriskany shell is well represented. 

 Locality. Stony brook, Moose river, Me. 



Leptostrophia magnifica Hall 



Plate 20, figures 20, 21; plate 21, figures 15, 16 

 See pt i, p. 190 



The shells of this species are highly characteristic often attaining the 

 full size present in the Oriskany of New York and the limestones of 

 Grande Greve. The predominant numbers however are smaller and there 

 is a notable variation in outline with a tendency to an elongate form. It is 

 extremely abundant in places. 



Localities. Matagamon lake, at the dam and about i mile above ; 

 Moosehead lake at Baker Brook point ; Askwith siding, Canadian Pacific 

 Railway. 



Leptostrophia oriskania Clarke 



Plate 21, figures 13, 14 

 See pt i, p. 194 



The specimens of these shells here occurring are all in agreement with 

 the type as to size and structure but they are entirely free from such corruga- 

 tions as appear occasionally in the Becraft Mountain Oriskany and frequently 



