NATURAL SCIENCES OF PHILADELPHIA. 
177 
Dr. Carson observed that the white fruited variety of Gaylussacia 
resinosa exhibited this evening, was very unusual, and desired that its 
locality, Warrior's Ridge, Huntington County, Pennsylvania, should be 
placed on record. 
Dr. C. M. Cresson called attention to the specimens of ripple-marked 
sandstone presented by him this evening. They were taken from Second 
Mountain in the gap, through which the west branch of the Schuylkill passed, 
Schuylkill Co., Pa. The formation is No. 10 of Rogers' enumeration, other- 
wise known as the Vespertine White Sandstone. These ripple-marked plates 
occur in thin laminae, and those at present exposed consist of three layers : 
two outer layers ripple-marked upon the surfaces next to the centre plate, and 
plane upon the exterior surfaces, and a centre plate ripple-marked upon each 
side, the markings fitting those of the enclosing laminae. These waves are 
extremely regular and very nearly parallel with each other. The apices or 
crests of the waves are about 3'' apart, and the depression varies from |" to f 
The thickness of the plates averages about 1|- inches. 
SepL 2\st. 
Vice-President Lea in the Chair. 
Forty members present. 
The following paper was presented for publication in the Proceedings : 
"Description of a new Tanager from the Isthmus of Darien, and note 
on Selenidera spectabilis, by John Cassin,'' and was referred to a Com- 
mittee. 
Dr. Leidy exhibited a large specimen of Cryolite, obtained by Mr. 
Frischmuth from a locality on the river Schuylkill, near Philadelphia. 
The death of Mr. John A. Yancleve, of Dayton, Ohio, late Corres- 
pondent of the Academy, was announced by Dr. Jas. C. Fisher. 
Sept 2m, 
Vice-President Bridges in the Chair. 
Thirty-three members present. 
A paper read before the Biological Department, entitled " Secondary 
formation of Blood Crystals by W. A. Hammond, M. D.," was ordered 
to be printed in the Proceedings of the Department. 
The following paper was ordered to be printed : 
Description of a New TANAGER from the Isthmus of Darien, and note on 
SELENIDERA SPECTABILIS, Cassin. 
BY JOHN CASSIN. 
Having recently had an opportunity of examining a collection of birds made 
on the Isthmus of Darien, I have been much gratified as well as surprised to 
find both sexes of the Toucan, recently described by me, under the name of 
Selenidera spectabilis, (Proc. Acad., 1857, p. 214.) The collection alluded to 
was made by a party under the command of Lieut. N. Michler, U. S. Topog. 
Eng., that surveyed a route for a ship canal across the Isthmus, by order of the 
Government of the United States. 
In the collection, there is also a single specimen of a Tanager of the same 
group as Calliste gyrola, gyroloides and Desmarestii, but distinct from either, 
1858.] 13 
