896 Scientific Intelligence. 
From the Introduction we learn that 
“The number of species of all ary Masa and described, in the 
Report, is oak 325, of which nearly 300 were discovered or first made ' 
known to science through the agency of a Illinois Geological fie 
Of these 325 species, 50 are plants, 156 invertebrate animals, and 119 ver- ‘ 
tebrates. Altogether they represent 115 genera, 25 of which have been 
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are plants, 67 invertebrates, and 30 vertebrates—the latter of which, 
with one exception (a Batrachian), being all fishes. Of the 115 genera 
represented, 81 are more or less ully characterized, and most of them 
illustrated in this volum ‘ 
From the cursor aiunien we have been enabled to make, we 
find many important oe to our knowledge of American Paleontol- 
ogy in this volume. At present we can only notice a few of them 
Mr. Worthen states thet. the fossil fishes abound in four horizons— 
usually limited to asingle stratum, rarely more than a few inches in 
thickness. In the beds which form the base of the Carboniferous sys- 
tem in Illinois, these remains are comparatively rare; but in the upper 
strata they become exceedingly abundant. The lowe st bed occurs in the 
upper part of the Burlington limestone. It i is a stratum of brownish- 
-measures, 17 feos the Chester limestone, 18 from the St. Louis 
limestone, 49 from the Keokuk limestone, 14 from the Burlington lime- 
investigated in oe ela must be conducted. Next follows an 
coh RVG, ae deseri ‘=P ~ n of a new fossil Batrachian, discovered aay ages 
ven, ni orris, Gea nois, ina bed n he 
oF dis via ecaicall dy county, Illino 
In Section Il will be found a great deal of information bearing on 
the classification of the Crinoidea ; especially as regards such genera as 
Actinocrinus, Cyathocrinus and Poteriocrinus the relations of which ate 
here discussed at length. The new gown Strotocrinus (M. & WwW) 3 
has the formula of Actinocrinus in the lower part of the body, but is 3 
em ape by the remarkable strata of the upper portion, which is 
greatly expanded and forms a rayed horizontal disc, th @ plane ¢ of 
which i is at right suiha Wicthe pe! axis. The interior of ‘Se egauis, 
