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



Leptostrophia magnifica Hall 



Plate 39, figure lo 

 For description see p. iqo 



This species in full proportions is present in the lower beds of Cape 

 Rosier Cove. 



Leptostrophia becki Hall 



S t ro p h o d o n t a beckii Hall. Palaeontology of New York. 1859. 3: 191, 

 pi. 22, fig. I, a-t 



The representatives of this characteristic Helderberg species are small 

 but sufficiently characteristic. 



Locality. Grande Cavee of Griffon Cove river. 



Leptaena rhomboidalis Wilckens 



Plate 34, figures i, 2 



Strophomena rhomboidalis Billings, op. cit. p. 27 



The specimens of this species are well characterized by the very steep 

 anterior fold which carries a broad median depression and two or more broad 

 radial undulations. In this and other respects the specimens are altogether 

 of the type of the Helderbergian examples and are noticeably distinct from 

 those of the higher beds. 



Localities. At Cape Rosier Cove and also in the beds at the Grande 

 Cavee, 



Strophonella punctulifera Conrad (sp.) 



Plate 37, figures lo, ii 



Strophomena punctulifera Conrad. An. Rep't Palaeontology of New York, 



1838. p. 117 

 St. eu glyph a Conrad idem. p. 36 

 S t r op h o d o n ta p u n c t u 1 if e r a Hall. Palaeontology of New York. 1859. 3: 



188, pi. 2T, fig. 4 ; pi. 23, fig. 4-7 

 Strop hodonta punctulifera Billings. Palaeozoic Fossils, op. cit. p. 30, pi. 3, 



fig- 2 

 Strophonella punctulifera Hall & Clarke. Palaeontology of New York. 

 1892. V. 8, pt I, pi. 12, fig. 10-12 



This well known Helderbergian species is quite common in the lower 

 division of Cape Rosier Cove. 



Strophonella leavenworthana Hall 



Plate 37, figures 7-9 



Strophodonta leavenworthana Hall. Palaeontology of New York. 1859. 



3 : 189, pi. 21, fig. 5-7 ; pi. 23, fig. 1-3 

 S t r o p h o n e 1 1 a 1 e a V e n w o r t h a n a Hall & Clarke. Palaeontology of New York. 



V. 8, p. I, pi. 12, fig. 6-9 



Specimens of this species are smaller than those of the New Scotland 

 beds of New York but the latter are otherwise without variation from the 

 type common at the Grande Cavee. 



