78 Geology, &c. of the Connecticut. 
Fig. 3. is probably the same as Fig. 2.; but perhaps not. 
The outline is given because the fins were more distinct 
than in the specimen from which Fig. 2. was copied. 
These are all of the natural size. Concerning their names, 
‘feeling altogether incompetent, I do not even attempt to de- 
ide. [have not had an apportunity to compare them close- 
ly with the Westfield send ang and do not know whether 
they coincide. 
Another oid occurs with these fishes, which re- 
sembles the commoa silver eel, (Muraena anguilla,) or some 
other species of the oat: iiibe. The width varies from half 
an inch to a whole one, and the length from one to two feet. 
The substance of the eel (if indeed it be one,) is not con- 
verted into coal, but there isa substitution of the shale of a 
finer grain, except the head, which is coal. No fins appear, 
_except, perhaps, in one instance, a pectoral one. “3 
“times, along the centre of the impression, there is a small 
relief, answering to the place of vertebrae. The course of 
the i impressions is usually serpentine. 
he geological situation of these ict icthyolites is interesting. 
The shale containing them passes under Moun nt Toby, there 
being a gradual ascent from this spot to the top of the 
‘mountain, two miles distant: so that they lie beneath rocks 
of the coal formation at the. depth of nearly nine hundred 
feet, most of the varieties described on the profile annex 
ed to the map here alternating with one another. The fol- 
lowing sketch exhibits a section of the shale of Mount Toby, 
so far as the geest would admit of examination, on a line 
ee from the locality of the icthyolites to the highest 
point of the mountain. 1 do not suppose it perfectly accu- 
ries but itis probably sufficiently so to answer the intend- 
ed purpose, viz. to exhibit the situation of the ichthyolites. 
The numbers in a parenthesis refer to those on the profile 
that are synonymous, The dip of these strata rarely ex- 
ceeds ten degrees, and is usually less. 
No. 1. (No. 59.) Very Coarse dark grey pudding-stone, 
for an account of it see the reference to the profile, on 
ded No. 8. atthe end. 
. 2. Bituminous Shale. This contains icthyolites— 
ata “nearly horizontal—dip never exceeding five degrees. 
Thickness of the stratum, about ten feet. 
No. 3. Same as No. 1. except sometimes alternating with 
