a of ae ee een ey ee 
Association n 313 
5 eRe Yes ? {= oo eee ai . ais 
lated equal in value to that derived from imilar means on the 
coast of Sweden, as bearing ‘the great | dyn ami es of yur earth. 
Prof. Bailey read a paper sere! to the ob he had made 
upon the microscopic fossils in specimens from the infusorial stratum 
and adjacent miocene deposits at Petersburg, Va., which had been sent 
to him for examination by M. consis iatek of that nese nlinsers 
erer of the locality. — 
He stated that the infantil Ga ,and naanehided: nat of Senne 
tella, Pecten, &c. contained all shee species: of | Coscinodiscus, Actinocy- 
clus, Dictyoca, &c. which he had previously described as characteristic 
of the pes me at Richmond ¢ ‘and, ee ace clifis 5 and that in ad- 
curious oreReEN fossil which mes suspected asi vet a ser pes of a 
ygoceros. 
In the niacat spichcanple fi odaaster no’ sre of Depiaiabe but 
found them abundant among the contents of the shells sent by M. Tuo- 
mey from the miocene beds. of Pi | of these 
were shown, among which were species a ‘Textularia, Rotalia, Trilo-. 
culina, and also of a minute crustacean, resembling a Cypris in form, — 
but which Mr. Dana. ra inigeimed jim: might be analogous to the) mar 
nie genus Cy therin 
Prof. B. then nine that tes had detected Polythalmia, ina appctlads 
of shelly limestone in the collection of Dr. Chilton in New York, which 
was used in ‘the construction of the Alamo, and which was probably 
quarried in the neighborhood of the. fortress: © ‘The species. appeared 
similar to. those of the ereticeous roup. fe also stated that he had 
* ar as Md. ‘sent by M. Tu 
y igotiferotin: 7 "As amber occurs at the same ~ 
locality, he: suggested — ey i might have produced 
h it aecompal 
Ap 
‘Prof. H. D. Roge m rea “the following letter from his. 
brother, Prof. pin sy & per of er on the limits of 
the prtaeepes rine in Jaane 
gett » University of vieginiss April 23, 1843. 
os sover” vat the infusorial stratum on the Rappahan- 
‘as referred to in my Report for the year 1840, 
de pact a | similar deposit at numerous other locali- 
ties, ing from the Potomac River to near the southern boundary 
of the state. “Among these points may be enumerated the Stratford 
cliffs on the Potomac, the vicinity of Westmoreland Court House, and 
Vol. xxv, No. 2.—July-Sept. 1843. 40 
