952 The American Naturalist. [November, 
As a summary of general results obtained from the study of these 
remains, Mr. Scudder submits the following propositions: 
1, The general facies of the Tipulid fauna of our western territories 
is American and agrees best with the fauna of about the same latitude 
in America. 
2. All the species are extinct. 
3. No species are identical with. any of the few described European 
tertiary Tipulidae. 
4, Of the Florissant genera, eight out of fifteen are extinct. 
5. All the existing genera, except Cladura (American) of the Amer- 
ican tertiaries are genera common to the north temperate zone of 
Europe and America, and are generally confined to those regions, 
Hence a similar climate is inferred; at least, there are no certain indi- 
cations of a warmer climate. 
Mr. Scudder is fortunate in having such beautifully preserved speci- 
mens with which to illustrate his paper. The delicate appendages, the 
markings and venation of the wings, and even the facets of the com- 
pound eyes are shown. The reproduction of the drawings of such 
delicate fossils reflects great credit upon the lithographer. (Proc. 
Amer. Philos, Soc., Vol. X XXII.) 
Diatoms.—A deep-sea dredging in the Atlantic Ocean, off Dela- 
ware Bay, yielded 145 species of diatoms comprising not only marine 
forms, but a large number that are known to be fresh-water, and some 
found hitherto only in a fossil state. They were submitted to Mr. 
Albert Mann for examination, who reports an entire absence of new 
species. This fact, taken in connection with the depth of the water 
(318 fathoms), and the number and variety of species, leads the author 
to conclude that the deposit is composed of fine detritus sifted down 
upon the sea bottom, and conveyed there by currents from a consider- 
able distance. A list of the genera and species is given, with references 
to the drawings and descriptions in published works by which they were 
identified. (Proceeds. U. S. Natl. Mus., 1893.) 
Scott on Agriochoerus.—Some fragmentary skeletons of Agrio- 
cheerus, associated with the teeth from the White river bad lands of 
South Dakota, have confirmed a conjecture made by W. B. Scott that 
Artionyx O. & W. is a synonym of Agriochoerus Leidy. This new 
material permits Dr. Scott to determine the relation that Agriocherus 
bears to the Oreodontide, by comparing the points of resemblance and 
