MUSEUM BULLETIN NO. 21. 
any trace of this fossil in beds higher than those from which 
Tyrrell originally reported it. Loose slabs of the dolomite from 
this bed, which are crowded with C. decussatus, may be found 
in the drift throughout the Grand Rapids district. It is particu- 
larly abundant in large, loose slabs in the bed of the stream flowing 
out of the old cut-off channel. Other specimens, evidently 
transported by glacial action, were observed on the high ridge 
west of Grand Rapids village. These slabs suggest a 
northerly extension of this bed in which C. decussatus is as 
abundant as it is in the river section. C. decussatus greatly 
predominates in the number of individuals over all the associated 
species combined. Other species are in fact scarce in this bed. 
The following species have been recognized in this fauna: 
Sponge spicules. 
Favosites niagarensis Hall. 
Halysites catenulatus L . 1 
Alveolites niagarensis Rominger . 1 
Lyellia papillata Rominger . 1 
Stropheodonta sp. 
Orthis cf. flabellUes Foerste. 
Conchidium decussatum Whiteaves. 
Euomphalus sp . 1 
Diaphrosionta sp. 
Trochonema sp. 
Bed (f) of the section is the lowest accessible bed near the 
head of the rapids. Fossils are common in this bed but not 
easily obtainable in a determinable condition. The collection 
from bed (f ) includes : 
Stromatopora sp. 
Favosites sp, 
Zaphrentis sp. 
Meristina? sp. 
Stropheodonta sp. 
1 Species recorded from this bed by Tyrrell, GeoL Surv^Can., Aim. Rep. Vol. V, p. 147E, 
(1893) not collected by the writer. 
