340 
PALAEONTOLOGY OF NEW-YORK. 
I have repeated, in this volume, figures of but two of the species already given in the 
Report of the Fourth District. These are fig. 3, plate 83, and fig. 1 e, plate 84, which will 
be described in connexion with the other species on the same plates. In addition to these, the 
following species, represented in the woodcut (figs. 1, 2, 5, 6 and 7), were found near Newark 
in Wayne county, and are described in the Report of the Fourth Geological District of New- 
York, page 138. 
Fig. 1. Cornulites - sp. Fig. 5. Spirifer - sp. 
2. Orthoceras laeve. G. Atrypa - sp. 
3. Loxonema boydii, see also fig. 3, pi. S3. 7. Avicula triquetra. 
4. Euomphalus sulcatus, “ fig. 1 c, pi. 84. 
FOSSILS FROM THE LIMESTONE AT GALT, CANADA WEST. 
The fossils from this locality are peculiar, being nearly all of new species, and, with one or 
two exceptions, different from those within the limits of New-York. My attention was first called 
to the peculiar bivalve shells on Plates 80 and 81, in 1847. In 1848,1 visited the locality, and 
obtained many other species. From the nature of the limestone, which appeared to succeed the 
well characterized limestone of Niagara falls, and from the similarity of some of the fossils 
with those of the Onondaga-salt group of New-York, I was inclined to refer the formation to 
the base of the latter group. A simple inspection of the Plates 79-84, will show that these 
fossils are typical of a distinct period from that of the Niagara group; and though the few 
species yet known from the base of the Onondaga-salt group in New-York seem scarcely suffi¬ 
cient to indicate a well marked period, or to claim positive identity in age with those of the 
Galt limestone, yet we are compelled either to regard them thus, or to rank the latter as a 
group entirely distinct from any yet recognized. The Galt fossils, as a group, are not only 
distinct from those of the Niagara period, but equally distinct from those of the succeeding 
geological periods of the Lower and Upper Helderberg limestones. They do in fact make a 
nearer approach to those regarded as devonian types, than to any group of Silurian age ; and 
yet we are able to prove their position to be quite below the limestone holding Pentamerus 
