296 General Notes, [March, 
Tertiary —M. V. Lemoine compares Pleuraspidotherium, a 
mammal from the Cornaysien fauna of Reims, on the one hand 
with Pachynolophus gaudryi, and on the other with Phalangista 
vulpina of New South Wales. The dental formule of Pleuras- 
pidotherium and Phalangista, are practically identical. The bones 
of the face are remarkable for the development of the intermaxil- 
laries and nasals, and for the almost complete ossification of the 
palatine vault. The lower jaw has a broad commissure, as in 
Pachynolophus, and a special development of the posterior branch 
recalls Phalangista, but is not inclined inwards.——M. F. Fon- 
tannes catalogues the pliocene mollusks of the valley of the 
Rhone and of Rousillon. These include 195 species of gas- 
tropods, of which 44 are new; and 146 bivalves, of which 24 
are new. The same writer describes the shells of the fresh- 
water and brackish group of Aix in Lower Languedoc, Pro- 
vence, and Dauphine, 92 species in all, 11 of which belong to 
Potamides, 11 to Striatella, 3 to Melania proper, 3 to Ripa, 14 to 
M. Neumayr (Neues Jahrb. fir 
Min., Geol. und Palzon., 1884) draws attention to the great 
similarity between the molars of Tritylodon Owen, from Cape 
Colony, and the molar of Triglyphus, described by Fraas from a 
bone bed near Stuttgart. 
Quaternary—A. Mehring (Kosmos, 1883) gives faunistic 
proofs of the former glaciation of North Germany. Against the 
“drift theory,” he urges that the greater portion of the low-lying 
parts of North Germany are either entirely free from animal re- 
mains, or enclose only land and fresh-water forms, which could 
not have been the case had a diluvial sea existed. Even the find- 
ing of marine animal remains in certain spots can be explained by 
position from southward moving glaciers, The nature of the 
deposits and other characters shows that the arctic fauna, the re- 
mains of which are found, had its home in the surrounding 
region. 
MINERALOGY AND PETROGRAPHY.! 
_ accounted for these optical anomalies by what is termed “ pseudo- 
_ symmetry,” ¢. e., the imitation, by certain crystals, of a geometri- 
1 Edited by Dr. Geo. H. WILLIAMS, of the Johns Hopkins Universit , Baltimore, 
ae Md., to whom all papers for review should “egies ee yan 
~ *Bull. Soc. Min, de France, T. v1, 1883, p. 122, 
