3i8 
The American Geologist. 
November, 1003. 
nichthys found by Dr. Lincoln and described by myself* with 
a few small spines and some shagreen reported by Beecher, are 
♦he only known forms from the MarceHus. In the Hamilton 
proper, an equally striking poverty is observable. A Coccos- 
i from middle Pennsylvania! and a Ctenacanthus from New 
\ ork ( Wright) are nearly all the vertebrate fossils yet an- 
nounced. 
The Genesee and the Portage continue the same story. A 
dorsal plate of Dinichthys (Ringueberg), a mandible (Clark), 
with a small quantity of confused material (Palaeoniscus, Dip- 
terus, \canthodes and a Pristacanthus) compose the fauna of 
these group?, while the Chemung, through the labors of Ran- 
dall, Beecher Sherwood and Lilley, has yielded a somewhat 
larger and more promising fauna, in Heliodus, Dipterus, 
Sphcijophorus, Holonema, Ganorhynchus, Phyllolepis, a Di- 
liichthys, an Onychodus and the more characteristic Holopty- 
chius and Helodus. Lastly, the Catskill, almost entirely barren 
of other fossils, except in its lower portion, holds in most places 
the plates of Holoptychius, Bothriolepis, Sauripteris, Glyptopo- 
mus, Dipterus and Gyracanthus, For details see the table of 
fossils from the Ohio shale. 
Vertebrates of the Devonian in Ohio. 
[Note. — For explanation of references see page 243.] 
a 
a 
M 
6 
« 
3 

u 
a 
u 

V 
S 
sd 
S 
'5 
u 

O 
V 
"5 
Si 
c 

u 

ti 
"5 
Si 
V 
u 
ffl 
V 
■o"5 
> 
V 
U 
Elasmobranchs. 
Machaeracanthut, major Nbv 
abd 
abd 
abd 
abd 
b 
b 
b 
b 
h? 
a 
ad 
M. sulcatus Nbv 
M. peracutus Nby 
Oraeanthus fragilis Nb\ 1" 
O. abbreviatus Nbv$ •.... 
. 
O. granulatus Nbv"'' 
ad 
* American Geologist, 1893. 
t Claypole. Amer. Geologist, 1893. 
i =Acantholepis, see d. p. 33. 
