Fossils Near Montreal. — Schuchert. 249 
This Niagaran species was not present in the Redpath 
collection last summer, nor is it listed by Dr. Ami. 
Strophomena profunda must therefore be removed from 
the Saint Helen's Island Helderbergian. 
Stropheodonta varistriata var. arata Hall. 
The National Museum specimens of this form are poor, 
but seem to agree with the New Scotland variety of the 
species, as found at Becraft Mt., near Hudson, New York. 
Strophonella punctulifera (Conrad). 
The specimens thus labeled in the Redpath Museum 
belong to an Orthis near oblata and a Stropheodonta, prob- 
abaly .S". varistriata var. arata. However, the species doubt- 
less occurs on the island, since Dr. Ami has it in his list. 
Spirifer concinnus Hall. 
This is one of the common species and appears in its 
typical form. 
Spirifer miirchisoni Castelnau, early variety. 
This is the commonest fossil of St. Helen's Island, 
and in the Montreal collections is usually found labeled as 
S. cycloptenis. It has, however, the general expression of 
a somewhat under-sized 5". inurchisoni from Cumberland, 
Maryland. It differs from the former species in being, as 
a rule, more alate, with fewer and more prominent plica- 
tions. Tracing these early departures from S. cycloptenis, 
the progression terminates in the Upper Oriskanian in the 
typical 5". murchisoni of large size, extreme inflation, an- 
gulation of the plications, fold, and sinus, and great Un- 
gulate extension of the ventral shell. 
"Spirifer allied to arcnosus" Donald, Decks, and Amo. 
This is apparently the earliest form of the S. arenosus 
type. However, it is not that species, since when small 
it is much like S. concinnus, but towards maturity the fold 
and sinus become plicated. Hall and Clarke figure a sim- 
ilar specimen as 6". concinnus (Pal. N. Y., VIII, Pt. II, 
pi. 30, fig. I ) . In S. arenosus of the Oriskanian, the hori- 
zon for this species, the plication of the fold and sinus is 
not a recently acquired character for it appears in the shell 
when quite small. 
"Stricklandinia gaspensis" Donald and Decks. 
The specimen in the Redpath Museum has nothing in 
common with this species. It is one of those large 
