EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 45 



and the large and fine S. n obi lis McCoy 1 exemplifies both characters 

 in very simple expression, both of these species being recognized as of 

 Middle Devonic age. The former species is commonly regarded as present 

 in the Eifelian. 



Horizon. Nos. 8, 9. 



Stropheodonta (Brachyprion) major Clarke 



Plate 9, figures 13-15 

 See pt 1, p. 190 



Brachyprion majus Clarke. N. Y. State Mas. Mem. 3. 1900. p. 54, pi. 8, fig. 8-13 



This species, described from the Oriskany horizon at Becraft mountain, 

 N. Y., is common at Dalhousie. It has the fasciculate arrangement of the 

 striae fully expressed at an early growth stage and on to maturity. 



Horizon. Nos. 1, 8, 9. 



Stropheodonta (Brachyprion) schuchertana Clarke 



Plate 9, figures 7-12 



Brachyprion schuchertanum Clarke. N. Y. State Mus. Mem. 3. 1900. p. 56, 

 pi. 8, fig. 1-7 



This was also described from the Oriskany of eastern New York and 

 is one of the commonest of the brachiopods at Dalhousie. 

 Horizon. Nos. 1, 8, 9. 



Strophonella punctulifera (Conrad) 



Plate 9, figures 16-18 

 See pt 1, p. in 



The specimens of this species seem to be in complete agreement with 

 those of the New York Helderbergian and of the St Alban beds of Gaspe. 

 If there is a noteworthy feature of difference it lies in the unusual width 

 of the cardinal areas of the two valves. In surface characters it approaches 

 the form we have designated, S. con tin ens var. e q u i p 1 i c a t a, from 

 the Grande Greve limestone, a member of a series whose derivation does 

 not bring it into immediate affinity to S . punctulifera. 



Horizon. Nos. i, 8, 9. 



Leptaena rhomboidalis Wilckens 



Plate 10, figures 1-6 



See pt 1, p. 183 



Of the expression of the Helderbergian shell. Extraordinarily abun- 

 dant in the upper layers of the section, exhibiting the pink tint of the shell 



1 Idem, p. 86, pi. 18, fig. 19-21. 



