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Astronomy. 285 
4. Commensalism among Animals—Van BrNEDEN, at the 
meeting of the Royal Academy of Belgium, on the fifth of March 
last, continued his observations on commensalism, or the living 
together of different species of animals. He first cited the follow- 
ing facts which he had received from Mr. Al. Agassiz. A species 
Lepidonotus, of California, is always found attached on an 
Sawcsecion (A. ochraceus "Bra andt) near its mouth, on differ- 
ent parts of the ambulacral rays, sometimes five of them on a sin- 
gle individual. A small fish of the genus Clupea is often found 
lodged in the folds of the fringes of a species of Pelagia grid 
ay qulaguecras ancl) species o trudinea live 
in the of a Beroé (Mnemiopsis Leydit) of Buzza ne 
Fes the Beros- never being seen without four or five of these 
worms, and often eee seven or eight. Between the buccal 
a C 
side Studies), a speci es oaee 14 eet in diamet eter, there 
i um oO of these 
Actiniz reside common y on each Cyanea. In an Awrelia of our 
coasts, a large number of Crustacea of the family Hyperina are 
often harbored. Another interesting fact is ee commensalism of 
the young Comatule on the adult. The of the species of 
the coast of South Carolina attaches itself 7 pee basal cirri, and 
they live like a small colony of young Pentacrini. As s of 
pecie 
Planaria, the P. angulata Miiller, lives always in free “ commen- 
sal” on the under surface of the American Limulus, near the base 
of the tail. 
Van Beneden next speaks of the relation of the siliceous Hyalo- 
nema to the pa a polyps (a peer: of t POaee); and makes it 
as a case of co nsalism of polyps on a sponge. He adds the 
fact that Mr. Diaar Schmidt has found i in the Adriatic a Polythoa 
iving on a species of sponge of the genus Awinella. He closes 
with repeatin an opinion he had plore, ei (in the Zool. 
Iv. ASTRONOMY. 
1. Discovery of a new Asteroid, the 11\th; ads Dr. C. H. F. 
Perers. From a communication by the author to one of the 
editors, dated, Litchfield Herren 3 of Hamilton College, Clin- 
ton, N. Y., Aug. 16, 1870,—I take pleasure in forwarding the 
observation made upon an ate, the 111th of the group, dis- 
covered here a before last. 
4 32°88 —13 12 29°6 
The planet was of about 114 magnitude. 
1870. Aug. 142 38 31 HO. mtlAR=2 2 35 20° acai 10 ‘5-41 10 Comp. 
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