Zoology. 278. 
1. Analysis af the Glassy Scoria of Kilauea, Hawaii, (Proceed. 
Bost. Soc. Nat. Hist., July, 1846, p. 121.)—This glassy scoria inelu- 
_ ding some of the capillary glass of the volcano, has been analyzed by Mr. 
J. Peabody in the laboratory of Dr. C. T. Jackson, with the following 
result : silica 50-00, protoxide of iron 28°72, lime 7-40, alumina 6: 16, 
potash 6-00, soda 2:00, 100-28, 
re IV. Zoouoey. 
1. Description of two New Species of Fossil Echinodermata, from 
the Eocene of the United States; by Samven Georce Morton, M. D., 
(Proceed. Acad. Nat. Sci. Philad. iii, 51, May, 1846.)—Cidaris Alaba- 
msis. Compressed, pentagonal, the angles rounded so as to form a 
ten sided figure. T'en rows of tubercles, with nine or ten in each row. 
Ambulacra arranged in five pairs, with delicate, slightly oblique fissures 
Separated by a double elevated line. Surface between the tubercles 
and ambulacra finely granulated. : 
_ Galerites? Agassii, Elevated, hemispherical, with four pairs of 
_ambulacra which diverge from the apex and meet at the margin, having 
each two rows of pores connected by transverse fissures. Surface 
marked by numerous, distinct granulations, which are continued over 
the whole base df the fossil. — . 
- Thave much pleasure in dedicating this remarkable species to M. 
Louis Agassiz, whose profound researches into this class of organized 
beings, have thrown much.new light on their structure, affinities and 
 Seological relations: © > <ae4 gators big 
Both these fossils were found by Dr. Albert Koch, in the Eocene 
- Strata of Washington Co., Alabama, and by him politely submitted to — 
Me for description. 
Above and below : upper surface of the interfemoral membrane hairy, 
: Willi the exception of a small part at its posterior extremity which is 
