816 General Notes, [ September, 
The bat and the bird are the types of the vertebrate machine: 
in them the hard pieces are internal, the motors external, and this 
is the fundamental difference between the two types. The gen- 
eral form of the machine and of the wing, and the distribution of 
consistency to the surface, as well as the rotation of the anterior 
edge, is comparable to what is seen in insects.—/ourn. Roy. Mier. 
Soc., April, 1886. 
UNUSUAL ABUNDANCE OF AURELIA AURITA—From the Ist of 
July until the 10th, Aurelia aurita, the common large jelly-fish, 
abounded in enormous numbers in Casco bay, Maine. They were 
gathered into shoals, for at.least hundreds of yards in extent, 
many of them in a dying condition, floating on their backs, and 
causing calm areas and streaks when the surface of the bay was 
elsewhere ruffled. At high water they stranded on the shore, 
forming patches four or five yards wide and hundreds of yards 
long, closely packed together, and often two deep. T have never 
through twenty years’ observation seen this species in such great 
abundance.—A. S. Packard. 
ence for a terrestrial life, can support life for days in water. 
into a jar of hungry leeches a puff of breath is blown, they br 
es 
~and with habits just like the European leech. In these Bees 
ce the segmental organs are shown to be sense-organs, 
