“aoe Martey having yet been } 
184 Sctentific Intelligence. 
not to have lived since the Carboniferous period; various new 
forms of sea-urchins, described by A. — having oe nearest 
allies in the Cretaceous, ete. The discovery of the living Cys- 
tidean mestle in the last number of this Journal is ae fact 
of the same kind, a a so remarkable that it may not seem unrea- 
Giuable to anticipate hereafter the discovery of living Ammonites 
and Trilobites 
These investigations have thrown great light upon the mode 
of of deposition of certain geological formations, especially the chalk, 
at the same time illustrate the manner in which, under the in- 
fatice of currents of different temperatures, a chalk and a sand- 
stone, with entirely distinct faune, may be deposited side by side 
others, aus allied to fossil forms, are supposed to have been mod- 
ot during Loses lapse of time by “natural selection,” or in some 
other w: 
oose, an : eve 
has probably” pe altogether too far in uniting species; as in cou- 
sidering the black-bear, the grizzly-bear, the barren ground bear, 
and the European bear all one species; and in his treatment_of 
the genus Blarina. He has also overlooked a specimen of Nea- 
soren tris in the Museum, from Norway, Me., = us 
_ Ine in the Proc. Boston Society of Natural History. 
IV. ASTRONOMY. 
Report on the Recent Eclipse of the Sun ; issued under the 
sean of the Superintendent of the A ‘aval Observatory.— 
This handsome volume of more than 200 pages has appea 
first of any of ihe reports of the ipbacaunie pepdision, only - 
detached portions of those of the Na utical Almanac > and Coast 
