198 Geological Society. 
between the colours of the upper- and underparts ; tail as in 
the other members of the group; the fur is extremely soft. 
In the female the colours are not so bright, and the red on 
the underparts is almost wanting. 
Measurements of the type, in skin (g) :— 
millim. 
lead tid (G0 ys sh. hascer siciaete opie 188 
Hind foot without claw...........-.. 43 
Rail (irpken), 05 cere meres 0s oxen — 
Tail of female without fur............ 143 
WILDSTUr te. tnt. s ciateeets 180 
” ” 
Hab. 'Tingasi, Monbuttu. 
Specimens examined :— 
Brit. Mus. 87.12.1.38. ¢. Killed 16.9.83. (Type.) 
age oO Cees oy LOO.Bo, 
These specimens were mentioned by Mr. Oldfield Thomas 
(P. Z. 8S. 1888, p. 9) under S. pyrrhopus, with a note saying 
that Tingasi was by far the most easterly recorded locality 
for the species ; also (P. Z. 8. 1890, p. 447) under S. pyrrho- 
pus typicus (parti). 
PROCEEDINGS OF LEARNED SOCIETIES. 
GEOLOGICAL SOCIETY. 
April 3, 1895.—Dr. Henry Woodward, F.R.S., 
President, in the Chair. 
The following communication was read :— 
‘On a Comparison of the Permian Freshwater Lamellibranchiata 
from Russia with those from the Karoo Formation of Africa.’ By 
Dr. Wladimir Amalitsky, Professor of Geology in Warsaw Uni- 
versity. 
The freshwater shells from the Russian Permian deposits be- 
longing to the genus Palwomutela are also known from the Karoo 
Beds of South and Central Africa, as pointed out by the Author in 
1892. He has recently had the opportunity of studying the actual 
specimens from the Karoo Beds, and finds in them species of the 
groups Paleomutela Inostranzewr, P. Keyserlingi, P. Verneuilit, and 
P. Murchisoni ; also of a new genus, the forms of which he had 
previously referred to Naiadites, Dawson. All these groups are 
found also in Russia, and he gives a list of species found in the 
upper horizons (A, B, and C) of the Permian beds of Russia and in 
the Karoo beds. These upper beds of Russia have been determined 
by the Author as the freshwater equivalents of the Zechstein ; con- 
sequently the Beaufort Beds of the Karoo Series, if considered as the 
