[WILLIAMS] FOSSIL FAUNAS OF THE ST. HELEN'S BRECCIAS 28B 



specimens no evidence of the hig-h area by which *S^. macra is distin- 

 guished from Sp. Helenœ. 



" 1542. Spirifor near Cumberiandiœ 

 St. Helen's Island 



McGill College Collection." 



This fragment contains specimens of Sp. pennatus Helenœ together 

 with several specimens of the Spirifer I have described as Sp. montrea- 

 lensis sp. nov. 



The basis of identification of these latter specimens with S. cumher- 

 îandiœ appears to be their size and the size and number of plications 

 of the surface. The angularity of the sinus, however, distinguishes 

 them from that species and brings them into closer relationship with 

 Sp. concinnus. The combination of these two characters is found in my 

 Ippecies vS'. montrealensis witli which I identify them. 



The specimen 1574 has the same angularity of the sinus in the 

 initial half of the shell but toward the front tlie sinus broadens and 

 flattens as in Sp. montrealensis. 



1574. Spirifer granulosus Con. 

 St. Helen's Island 



McGill College Collection. 



This is another specimen of the same form described under the 

 name Spirifer montrealensis sp. nov. The surface is preserved suffi- 

 ciently well to show roughening, but tlie roughening appears to be in 

 distinct concentric rows like the marking of Sp. concinnus (See Hall, 

 Plate 25, Fig. 2f) and not in irregularly distributed pustules as in 

 Sp. granulosus. The specimen shows 16 distinct plications each side 

 the sinus, the one bounding the sinus being less conspicuous than the 

 plications following. In this character it closely resembles large speci- 

 mens of Sp. concinnus from a limestone from Covington, Virginia, 

 (locality 1392 A' of the United States Geological Survey Collections) 

 with which I have compared it. The angularity of the sinus of S, 

 montrealensis forms a link of relationship between Sp. concinnus and 

 the var. Clintoni of Spirifer granulosus. 



1564. Spirifer 



St. Helen's Island. 



McGill College Collection. ^ 



This is a mass of beach v jrn casts of a shell which I would identify 

 with Sp. montrealensis. 



Xone of the specimens of this collection exhibit characters to dis- 

 tinguish them from the species already described from the Côte St. Paul 

 block as Sp. pennatus var. Helenœ v. nov. and from the fuller series of 



