270 Scientific Intelligence. 
4. Sivatherium in Colorado.—Dr. Leidy refers a fragment of 
a fossil ron Colemds facet through Dr. Hayden ‘from Dr. 
Gehrung), with a query to a genus near Sivatherium, which he 
calls Megacerops. He regards the fossil as corresponding to that 
portion of the face which comprises “the upper part of “i Lane 
together with the forehead and anterior horn cores. ” The animal 
to which it belonged was nearly as large as the Sivatherium. The 
distance between the center of the two horn cores is 103 inches ; 
the length of the horn cores above the intervening space 5 inches ; 
the breadth of the face where narrow below the horn cores 7} in. 
He names the = aes —— Coloradensis,—Proe. Acad. Nat. 
1870, p. 13) as hav me been found in a crevice in the lead-bearing 
rocks near Galena, 130 feet below the surface, along eg a last 
lower grinder of the was a Ox, Bison a antiguus. e m of 
the Academy contains other bones from the same babe, beak 
remains of a large extinct Pecvary, £ tatyaonte: lk e8sUs, AN eX- 
_ Raccoon, Procyon priscus, and a large ore, Anemo- 
=) alone. all of which were probably sata of the 
ega 
exxxviii, 449).—Vom ae describes and figures here erystals of 
the followi ing Vesuvian minerals: twins of Anorthite, crystals of 
g an 
mineral from Laach which he names Amblystegite, 
and a description of certain twins of orthoclase. 
Amblystegite occurs in small crystals of a brown to reddish- 
brown color, a gray streak slightly sere adamantine luster. 
The erystals are orthorhombic; #-4:1=135° 50’, 77: 1-8=119° 26’, 
4-4: 44=1638° 47’, 74: 498 © 6h. . B.B. very ; faible and thus differs 
from humite and chrysolite. Composition, 
Si49-8 415-05 Fe25-6 Mg17-7 Oa 0:15=98-30, 
corresponding to the “yes ratio oe B, Si, 12°81: 2°36: 26°56. Only 
sed. 
half a gram was here e mineral is so mixed with mag- 
netic iron as to be s ‘a aaras ted with difficulty for — 
10. Laxmannite of a ap J. £ pr. Ch., cvii, 491) ac- 
cording to Hermann (ib. I, i, 447) is probably Vanquelinite; 
Nordenskiéld made the er vital monoclinic with the inclination 
of the vertical axis 69° 46’; G. = 5°77, H. = 3, color olive-green ; 
and obtained for the composition (mean of two analyses) — 
Bs31 Gr15-91 Pboeiie Cullé64 Fe1-06 H110=99°18 
Hermann observes that ae probably — the same 
mineral in his sitiutalnatae of the species he named ee 
and that if the pure oxyd of are sate of Berze ties be taken as a 
mixture of phosphoric and.chromic acids, the two analyses ners 
see as follows : ; 
<3 SS ene 
