84 The American Natnralist (January, 
with notes on Leucothoide, Pardaliscide, and Gammaride. The 
American Gammarus ornatus is shown to be the same as G. locusta, 
while there are notes on three other species which range to American 
seas. 
Arthropoda.—Mr. Arthur Dendy reports (Wature, Feb. 14, 1889) 
the discovery of a new species of Peripatus in Victoria, Australia. 
Albert D. Michael describes (Jour. Roy. Micros. Soc., Feb., 1889) 
the anatomy of the mite Uropoda krameri. The paper is not one ad- 
mitting of abstract. The general features of the species are Gamasid, 
but as in its shape it approaches the Bropodide, so it does in its 
structure. 
Hexapoda.—According to the Jour. Roy. Micros. Soc. for Decem- 
ber, Dr. D. Casagrande claims that in the silk-worm (in which he 
traced the metamorphosis of the alimentary canal from the larval to the 
adult stage) ‘‘ the epithelium of the cesophagus and of the hind gut 
of the perfect insect is derived from the mid gut; in such a case the 
cesophageal and hind gut epithelium in the adult insect cannot be re- 
garded as ectodermic in origin, as they are in the larva, but must be 
entodermic, arising as they do from the mid gut.” The writer has re- 
cently shown (A. Nat., XXII., p. 471, 1888, and more fully in a paper 
soon to be issued) that in Crangon the alimentary tract proper is 
wholly of ectodermal origin. Now no one has yet published any com- 
plete account of the development of the digestive tract in the Hexa- 
pods, but there is much reason for suspecting that in this group a 
similar condition of affairs exists. The observations of Dr. Casagrande 
are strongly confirmatory of this view, which,if it be true, relieves us 
from the necessity of replacing organs derived from one germ layer by 
cells derived from another.—J. S. KINGSLEY. 
Vertebrata.—T. H. Morgan concludes (J. H. U. Circ., No. 70) 
that in Amblystoma punctatum part of the blastopore is converted into 
the neurentric canal, and part persists as the anus, while in Rana hale- 
cina the blastopore completely closes. 
The South American bat (Noctilio leporinus) is stated to eat fish. 
Specimens have recently been studied in which fish-scales were found 
in the stomach. 
Mr. P. L. Sclater sends to Mature, No. 1012, the substance of a 
suggestion made by Mr. W. Rodier, of New South Wales, for the ex- 
termination of rabbits, which has at least the elements of plausibility. 
It is to catch as many of the rabbits as possible by means of traps, 


