NATURAL HISTORY MISCELLANY. 795 
richness of this locality was again apparent, and we added to our 
collection a number of species, among these may be mentioned 
Liodon ictericus Cope and a new Clidastes. 
The writer originally pointed out the existence of representa- 
tives of the orders Pythonomorpha and Sauropterygia, in this 
Cretaceous basin. Prof. Marsh’s explorations determined the ex- 
istence of Ornithosauria and Crocodilia. The present investiga- 
tion adds Dinosauria and perhaps Testudinata, or the group the 
new form Protostega Cope, represents. 
The preceding account expresses some points of interest ob- 
served. These with others now unnoticed will be included in a 
final report. 
The giants of this sea were the Liodon proriger Cope, L. dyspe- 
lor Cope, Polycotylus latipinnis Cope, and Elasmosaurus platyurus 
Cope. Of these the first was apparently the most abundant. The 
second was the most elongate, exceeding in length perhaps any 
other known reptile. The last named had the most massive body, . 
and exhibited the most extraordinary appearance in consequence 
of the great length of its neck. 
For kind assistance I am much indebted to Captain Edwin 
Butler post commandant at Fort Wallace ; to Dr. W. H. King 
post surgeon; and to Captain Wyllys Lyman. To Lieutenant 
James H. Whitten and Sergeant W. Gardiner who accompanied 
the expedition much of its success is also due. —Epwarp D. 
Corr, Fort Wallace, Kansas, Oct. 9th, 1871. 
MICROSCOPY. 
Anrens’ Brxocutar.— This instrument, the fourth new binocu- 
lar brought forward within a few months, was submitted to the 
Royal Microscopical Society, of London, on the eighth of Febru- 
ary last. It is applicable mainly to high powers, being manifestly 
unable to compete with Wenham’s arrangement for low powers. It 
naturally stands in comparison with the contrivances of Mr. Tolles 
and President Barnard. Like Dr. Barnard’s, which was published 
some months previously, it separates the light above the objective 
into two pencils by double refraction by means of Iceland spar, 
cut and cemented in a somewhat complicated and difficult manner. 
In other respects the two instruments are entirely different. In the 
new arrangement the pencils of light pass upward from the prism 
