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POPULAR SCIENCE REVIEW. 
A large Machairodus , of which a nearly complete skeleton has been 
obtained, differs from the great Brazilian species ( Machairodus neogceus) in 
the form of the skull, and in having only two instead of three lower molars. 
M. Gervais proposes to call it M. necator. 
The remains of Glyptodonts confirm the separation of those animals into 
several genera, as proposed by Burmeister. One of them is described as a 
new species under the provisional name of Glyptodon rudis, but the author is 
of opinion that it will constitute the type of a new genus. Its bony plates are 
quadrangular and rough on the outer surface, but without rosaciform tuber- 
cles, and without radiating lines. The rings of the caudal sheath are composed 
of separate pieces, which interlock after the same fashion as the dorsal plates. 
Another undescribed species, of which only a small portion has been brought, 
seems to be nearly allied to Hoplophorus, but is distinguished from the 
known species of that genus by its bony plates, which consist of a smooth 
central polygonal disc with blunt angles, having on its sides smaller smooth 
plates in the form of arcs of a circle. The author names this species Hoplo- 
pJioi'us discifer. M. Ameghino, one of the collectors of these fossils, has 
also obtained in the La Plata region numerous objects of human workman- 
ship, some of which are believed to date back to the period of the great ex- 
tinct Mammals. ( Comptes rendus, June 3, 1878.) 
An American Jurassic Pterodactyle . — Professor Marsh describes (SiUimarfs 
Journal , September 1878), the first indication of a Pterosaurian from American 
rocks older than the Cretaceous, the species found in which are generally of 
gigantic size, and so far as is known belonged to that toothless group of these 
reptiles which Professor Marsh proposes to name Pteranodontia. The speci- 
men now described is from the “ Atlantosaurus beds” (Upper Jurassic) of 
Wyoming, which have lately yielded the remains of so many interesting 
forms of reptiles. It is the distal portion of a metacarpal bone of the right 
wing, and indicates a Pterodactyle with an expanse of wings of four or five 
feet. Its shaft shows an oval section, but near the condyle becomes sub- 
trihedral, with a distinct ridge on the under surface. It is hollow, with thin, 
smooth walls. The outer condyle is placed obliquely, as in the Cretaceous 
species ; the lower groove between the two condyles is unusually narrow ; 
and the inner condyle is nearly circular in vertical outline. The fragment 
presents no characters by which its generic relations can be established, and 
Professor Marsh describes it under the provisional name of Pterodactylus 
montanus. 
Geology of Sind. — Mr. W. T. Blanford has communicated to the Asiatic 
Society of Bengal (“Proc.,” January 2, 1878) some notes on the geology of 
Sind, a map of which has just been completed by the Indian Survey. The 
greater part of the province consists of the alluvial flat of the Indus, but in 
the west ranges of hills occur containing Tertiary and, as is now believed, 
■Cretaceous rocks. A thin flow of basalt supposed to represent the Deccan 
traps underlies the undoubted Tertiaries. Mr. Blanford gives the following 
table of the beds of Sind : — 
