SCIENTIFIC SUMMARY. 
445 
ZOOLOGY AND COMPAEATIVE ANATOMY. 
The visual powers of the Eye of Crustacea. — M. Bert, whose curious re- 
searches on animal engraftation we described some time since in these pages, 
has been making some experiments on the effects of light on the eyes 
of Crustacea, and which were communicated to the French Academy of 
Sciences by M. Milne Edwards. M. Bert has found that the obscure radia- 
tions produce no effect on the eyes of these animals. The colour which has 
the greatest effect is that of the yellow part of the spectrum. — Couiptes^ 
EenduSj Aug. 2. 
A new Aealeph, Callinema ornata, has been discovered on the American 
coast by Professor A. E. Verrill. It is a very large and fine new jelly-fish, 
rivalling in size even the common red one, Cyanea arctica, which it slightly 
resembles, and for which it might be mistaken at a distance. It is, how- 
ever, more yellow in colour, the large complicated ovaries hanging down 
below the disc being light orange, and the long frilled mouth appendages 
bright lemon-yellow. The tentacles are about eighty in number, arranged 
in a nearly continuous circle, and may extend fifteen or twenty feet in large 
specimens. They are also very remarkable in being fiat and broad, with one 
edge double and divided into crenulated scallops, which are margined with 
white, producing a very beautiful appearance. The whole body and ten- 
tacles give a white phosphorescent light. The largest specimen was eigh- 
teen inches in diameter. It is remarkable that so conspicuous an animal has 
so long escaped observation. It belongs to a family previously unknown on 
the coast, and forms the type_of a new genus. — Vide American Journal of 
Science, J uly, 
Berardius Arnuxii. — A notice of this Ziphid whale was read before the 
Phil. Society of Canterbury, New Zealand, at a late meeting. The notice was 
by Dr. Haast the eminent geologist. 
The Practical Zoology of the Oyster. — M. Coste, member of the Institute, 
Inspector-General of Fisheries, has been charged by the Minister of Agri- 
culture and Commerce with an enquiry into the causes of the late mortality 
in the oyster beds, and the means of preventing a recurrence of the calamity. 
The great heats have been fatal to the fish in all the beds of the south-west 
coast of France and in the Channel. 
Recent Researches on the Calopteryginm. — At the meeting of the Eoyal 
Academy of Belgium, on June 5, M. de Selys-Longchamps made a commu- 
nication on the Calopteryginae. In his first synopsis he described no less 
than 100 species of these. In a supplement published in 1856 he made 
known 118 more ; and in the present paper he adds thirty-two more new 
species. 
Deep-sea Dredging in 2,435 fathoms. — At the meeting of the British Asso- 
ciation the Eev. A. Merle Norman read a letter from Professor Wjwille 
Thomson describing some of the results of the recent dredgings of thS Por- 
cupine. Professor Thomson had recently di’edged in the Bay of Biscay 
to the depth of 2,800 fathoms, and the letter gave an interesting account of 
the casting of the dredge at such a depth. About 14 cwt. to 2 cwt. of ooze' 
was the general result of a cast of the dredge, and the thermometric instru- 
