162 Miscellaneous. 
The existence of fossil plants as well as of fish-remains in the 
Devonian shales and sandstones of Scaumenac Bay was noticed by 
Dr. Abraham Gesner in 1842; and from these rocks Mr. Foord also 
obtained four species of ferns, which have recently been reported on 
by Principal Dawson. 
The analogies between the fossil fauna of the fish-bearing beds of 
Scaumenac Bay and that of the Old Red Sandstone of Scotland and 
Russia are very striking.  Pterichthijs canadensis is still doubt- 
fully distinct from the Bothriolepis ornata of Kurope; the fragments 
of a Diplacanthus obtained by Mr. Foord have apparently much the 
same characters as the D. striatus of Agassiz; and the genus Phane- 
ropleuron can now be shown to occur in the Devonian rocks of 
Canada as well as in those of Scotland. Husthenopteron has many 
features in common with T'ristichopterus; one species of Glyptolepis 
from Scaumenac Bay seems to be identical with the G'. microlepi- 
dotus of Agassiz, from Lethen Bar, while the other bears a general 
resemblance to the G. leptopterus of the same author; and, lastly, 
Cheirolepis canadensis is certainly very closely allied to two Scotch 
species. 
; These Devonian rocks at Scaumenac may have been of freshwater 
or estuarine origin; for no traces of any marine invertebrata have 
yet been detected in any of them, and the fossil fishes which they 
contain are invariably found associated with land plants.—Amer. 
Journ. Sci., June 1881. 
Migrations of the Poplar-Aphis (Pemphigus bursarius, Linn.). 
By M. J. Licurensrein. 
In August of last year* I had the honour to announce to the Aca- 
demy that the Aphis of the woody galls of the poplar (Pemphigus 
bursarius, partim, Linn., sub Aphis), placed under a bell glass on 
its escape from the galls, upon a plant of /ilago germanica, produced 
young which, having in their turn acquired wings, had furnished 
sexual insects, laying in abundance upon fragments of poplar-bark 
placed within their reach in my study. 
These sexual forms, which had no rostrum, copulated and fur- 
nished numerous fecundated ova. 1 say numerous, because the 
females themselves were very numerous; for each of them, like all 
the Pemphigine of which I know the sexual forms, has only a single 
ovum in its body. 
The copulation is preceded by several moults, which appear to 
me to be fourin number. Although they had no mouth, and con- 
sequentiy could not.feed, these little animals inereased in size, like 
seeds put to soak. ‘The male dies first, after having fecundated 
several females. When the female arrives at the moment of ovipo- 
sition, we sec issuing from her body very numerous white filaments, 
* See ‘ Annals,’ November 1880, p. 404. 
