300 Notice of Ehrenberg’s I emo ir on Microscopic Life. 
No less than one hundred and twenty forms of siliceous and 
calcareous animalcules and siliceous parts of plants were detected 
by Ehrenberg among marine Alge brought from Vera Cruz by 
his brother. Among the figures of these forms, we notice fig. 
43, plate 3, (Planularia? Pelagi,) as strikingly like a fossil Poly- 
thalamian shail abundant in meiocene tertiary of Petersburg, Va. 
e pass now to the notice given by Ehrenberg of the locali- 
ties of the United States, and we regret that our limits will not 
allow us to insert his account without abridgment. 
“The first specimen of the infusoria of the United States whichI — 
received, consisted of a portion of the fossil infusoria from West Point, 
a specimen of which was sent over by Dr. Torrey, and received in 
1839. Since that time the richest American materials have been ob- 
tained from the United States, where the distinguished native men of 
science have devoted themselves to the examination of these relations 
with great zeal and success. 
“* Richmond, Va.—A rich booty, consisting of the fossil forms alone 
of Virginia, has been discovered by the exertions of Prof. W. B. Ro- 
gers, the geologist of Virginia. Some of the species haye been repre 
sented in Prof. Bailey’s sketch of American Bacillaria, and he alludes: 
to the apparent resemblance of this geological formation to that of Oram 
e 
The strict comparison of these relations possesses now a peculiar 
ar geo- 
logical interest. I have taken the following list of 11 Virginian fons 
forms from Prof. —— S$ memoir. 
Baile 
Ehrenberg. 
1. Pyxidicwlar fig. 2, = Pyxidicula cruciata. 
2. Gallionella sulcata, fig. 7, = Gallionella sulcata. . 
3. Actinocyclus sulcata, fig. 10, Actnopgetus octonarius.* iy 
“se 
. fig. £i, oe senarius. 
5. Coscinodiscus lineatus, fig. 12, = Coscinodiscus lineatus. 
6. patina, fig. 18, = _ minor. 
7. 22 radiatus, fig. 14, = ws gigas. 
8. ” argus, = - argus. 
9. 2 oculus iridis, = a oculus iridis. 
“In the specimens of the tertiary ‘infusorial stratum’ of Richmond, 
kindly sent to me through Prof. Bailey from Prof. Rogers, I have, UP 
to this time, observed the following fifty forms, and have compared 
them direetly with the European forms, and also with those from Ora? 
in Afri 
$$ 
* Under the new genus Actinoptychus are now placed those species of the old 
genus Actinocyclus which possess internal partitions or folds, while — the old 
sai Ee are retained those in which the external rays are not connected W 
n 
iw ye 
, = 
