386 Microscopic Organisms in Hornstone. 
et from the Corniferous limestone of <atat ae western New — con- { 
ng the greatest variety of these organic forms. A few specimens have 
— found in hornstone of the Black River Lipeatiall from Griiitoen, N.Y. 
which are be cath abundant in the hornstone from peter ee of 
and western New York. Fig. 27 is are to be part of 1 
1: <2.7 + aoe G-1000th 
to 7-1000th of an inch in pao the true nature of which has not been 
determined. 
a Gasteropod. 
igs. 28, 29 and 30 oo structures found in hornstone from the Black 
River limestone from a NeYy 
tion of an Fa) Soa i body, ;45 inch in 
diameter osed in a distinct Shell, the 
ellipsoidal acharother of which _was clear- 
himestone, the shell oe filled with very 
qua 
rad Alen in the figure, found in the hornstone 
from the Black River limestone, is filled 
with a crystalline substance of a silky ap- 
nee, very nearly trans 
pearance 1 nt. Nea 
the larger end is a disk, d, which is prob- 
d 
at the suggestion of Prof. Dana, who fur- bled me 
nished the specimens a of Seca . the examination of which re enabled 
to make these most interesting coma Yours, M C Waits. 
New Haven, Conn., March 22, 1862. 
