210 ■ ROYAL SOCIETY OF CANADA 



examining the specimens in the Peter Redpath Museum referred to 

 *' Spirifer allied to Arenosus " of Donald, Deeks and Ami, Schuchert 

 says that it "is not Spirifer arenosus/' " tho' apparently the earliest 

 fcrm of the S. arenosus type." i 'The specimens in the collection studied 

 by me are distinctly Spirifer arenosus, of good size and well developed, 

 thus showing the prejsence of the early phase of the species as exhibited 

 in the Cumberland, Maryland, Oriskany and also in the Moose river 

 sandstones of Northern Maine. 



Study of the Fossils. 



'The material obtained by blasting from the three exposures of lime- 

 stone situated on the northeastern edge of the brecciated area was sent 

 me in bulk labelled lots 1, 2, and 3. I had it broken up in the labor- 

 atory keeping the lots separate and giving them numbers: 252.1 to Lot 

 1, 252.2 to Lot 2 and 252.3 to Lot 3. I conclude from the reading of 

 Nolan and Dixon's paper ^ that the lot marked Lot 1, by Ardley, came 

 from the larger limestone mass described as " the north exposure, 200 

 fert in length." "a dark grey, fine grained semi^crystalline limestone 

 which is someivhat bituminous. It has been brecciated along the contact 

 loith the breccia, and the angular fragments have been cemented by a 

 paste lohich diffem in composition from the limestone." Lots two and 

 three came from the smaller (100 square feiet) south exposure which is 

 cut by a dyke. " The rock is a fine grained, light grey, friable lime- 

 ston,e." Lot 2 is from the main mass. Lot 3 from the smaller mass east 

 of the dyke. An exhaustive study of the fossils discovered in the several 

 masses has furnished the following lists of species, which I have severally 

 designated as tlie Spii'ifer arenosus fauna (252.1) and the Gypidula 

 pscudogaleata fauna (252.2 and 3), from the diagnostic species dis- 

 tinguishing them. 



Lists of Species. 



The Spikifer arenosus fauna. 



(List of species from Lot 1, (252.1), the northern exposure of lime- 

 stone mass in the northeast part of the area of the limestone breccias, 

 St. Helen's Island,.) 



1. Chaetetes sphaericu's. Hall. 



2. Small Crinoid stems. 



3. Orthis (Ehipidomella), cf. oblata. Hall. 



1 Ara. Geol. XXVII. 1901, p. 249. 



- Nolan, A. W., and Dixon, .T, D., Geology of St. Helen's Island, Canadian 

 Record of Science, Vol. IX, 1903, pp. 53-66. (See p. 561.) 



