PALAEONTOLOGY OP NEW-YORK. 
54 
however, that in the measurement of strise in the space of two lines, on 
some of the more finely striated species, it is scarcely possible to include 
the same number of striae between the points of the compasses at any 
two places upon the surface. 
Species. Length. "Width. 
Depth. 
Length of arei 
Striae in the 
i. Rear beak. 
s space of 
Middle. 
two lines* 
Near front. 
Orthis ALSUS - 1.18 
1.23 
.40 
.79 
if 
8 
8 
1 
« « 1.08 
1.24 
— 
— 
AO 
8. 
. A 
* Orthis livia-1.12 
1.21 
.40 
.57 
i 
f 
6 
Orthis idoneus .. 1.07 
1.23 
.45 
.55 
if 
'11 
1 
« « .. .80 
.96 
— 
.40 
it 
11 
If 
Orthis semele .. 1.24 
1.40 
— 
.88 
— 
8 
8 
1 Orthis vanuxemi, 1.03- 
1.10 
.43 
.45 
Ah. 
AA 
2 “ “ .. 1.15 
1.28 
.55 
.60 
11 
11 
V - 
8 “ « 1.18 
1.23 
.46 
■ .47 
If 
To¬ 
X 
4 « “ .. 1.00 
1.09 
— 
.47 
If 
ll 
I 
oo 
00 
1.03 
.37 
.44 
11 
H 
f 
1 Orthis penelope, 1.37 
1.59 
— 
.65 
If 
11 
1 ' 
2 « “ .. 1.33 
1.58 
— 
.58 
11 ' 
11 
1 
3 « “ .. 1.43 
1.60 
— 
.73 
11 
11 
X 
4 “ “ 1.15 
1.36 
— 
.58 
11 
11 
f 
5’ « « .. 1.17 
1.39 
— 
— 
If 
If 
f 
6 « “ 1.17 
1.31 
— 
.54 
AS. 
AS 
8. 
1 Orthis leucosia, 1.02 
1.04 
.52 
.46 
11 
TO 
T 
2 « « .. 0.79 
0.83 
.40 
.31 
11 
If 
t 
3 “ “ .. 0.88 
0.95 
.40 
.37 
If 
If 
f 
4 “ .. 0.95 
1.02 
.‘48 
.34 
A4 
±2 
f 
Orthis idas. 1.53 
1.71 
.40 
1.14 
If 
f 
m 
1 Orthis lenticularis, .77 
.77 
.47 
.54 
S "2 
T4=is 
2 “ “ .. .59 
.62 
.28 
.44 
M . 
ft 
TT^T8 
Orthis propinqua, .83 
.98 
.62 
.55 
-■ - 
TO 
I 
1 “ « . 
lf+ 
AA* 
If 
2 “ “ . 
— 
If 
— ‘ 
* In these three columns, the upper figures indicate the dorsal valve, and the lower the ventral valve, 
f Besides several finer intermediate ones. J Counting the intermediate ones. 
