GEOLOGY. 495 
adyanced wives? It is rather hard for Nature to follow, or even 
compete, with the fast driving of the evolutionary disciples, but as 
she is after all a very good natured old lady I have no doubt she 
will do her best not to stay too far behind the prevailing views of 
evolution. 
Concerning the new species, “ O. inermis,” the description of 
the single specimen does not give any character by which to sep- 
arate it from the old species, C. pellucidus. I have not seen Prof. 
Cope’s type, and, though he states that his specimen is a male, 
he omits to inform us to which of the two forms of males it 
belongs, but his description applies perhaps to the second form of 
the male, the characters of which are always less marked than in 
the first— Dr. H. HAGEN. 
GEOLOGY. 
New anp RemarKaBie Fossirs.— We copy from the “ College 
Courant” the following summary of the latest published results 
of Prof. Marsh’s expeditions to the West ;—The extensive collec- 
tion of fossil vertebrate remains which were made in the West by 
the Yale expeditions of 1870 and 1871, are yielding, in the hands 
of Professor Marsh, results of the greatest value to palwon- 
tological. science. Ten important papers upon the new material 
thus obtained have already been contributed by ‘ this indefatigable 
palæontologist” to the “ American Journal of Science,” the last 
three of which relate exclusively to the collections of 1871. The 
first of these later papers, published in April, contains a descrip- 
tion of some Pterosaurian remains, additional to those discovered 
by the expedition of 1870, of which an account was pub- 
. t a year ago. To the gigantic species of ptero- 
dactyl then obtained, Professor Marsh gave the name Pterodac- 
tylus occidentalis. The expedition of 1871, in exploring the 
iginal locality in Western Kansas, not only obtained further 
Portions of the same skeleton, but secured other specimens which 
Prove the existence of two other gigantic pterodactyls during the 
i Cretaceous. The characters of Pterodactylus occidentalis 
derived from the study of portions of five individuals. They 
Sow clearly that the species belongs to the short-tailed or true 
erodactyls, and that it contains some of the largest “ flying 
ons” yet discovered, the spread of wing in these individuals 
