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POPULAR SCIENCE REVIEW. 
wliicli^ in point of fact; as worked out by Herr Bastian, depends on the 
supply of zoosperms. 
The late M. Serves, with whose many fine essays on Palaeontology our 
readers have from time to time been made familiar, has bequeathed to the 
French Academy a sum to be devoted to a triennial prize of the value of 
60,000 francs, to the best memoir on “ General Anhyology.” 
The Egg of Trematodes.— \xs. a memoir lately read before the Royal 
Academy of Belgium, by M. Ed. Van B.eneden, the author points out that 
in the eggs of these Helminthes, the vitellus before development is divided 
into several cellules. From this he draws a conclusion which he does not 
seem to be aware was already drawn by M. Be Quatrefages, that the ovum 
cannot, as Schwann formerly regarded it, be considered as a typical cell. 
Nature-printed Butterflies. — We would call the attention of those of our 
readers interested in Lepidoptera, to an admirable collection of these insects 
now in the possession of M. Bailliere of Begent Street. W'e call them 
nature-printed, but they are not so strictly. The wings of the insects are 
mounted in their natural state on paper, and the bodies are painted in 
sepia. The collection was originally made by some French amateur, whose 
name unfortunately is not known. The collection extends over eight 4to 
boxes (imitation volumes), the specimens being arranged four or five on 
a sheet, to the number of 4,000. The following groups are represented 
nearly completely : — Papilo, Sphynx, Bonibyx, Noctua, Geometra, Pyralis, 
and Tinea. The work is said to have taken fourteen years to complete, and. 
was evidently undertaken con amove. Nothing can exceed the beauty of 
the insects thus mounted. 
Polymorphism of Anthozoaria and Structure of Tuhipora . — Herr Kolliker 
has published a paper on this subject in the Bihliotheque JJniverselle, which 
the Microscopical Journal thus epitomises : — “ The polymorphism of indivi- 
duals, so remarkable among the Acalephae, had till now no parallel among 
the other Coelenterata. It is, therefore, a discovery as little expected as 
that of a veritable polymorphism, which Professor Kolliker has made among 
various genera of Anthozoaria and Alcyonaria. This polymorphism con- 
sists in this, that besides the large individuals susceptible of taking nourish- 
ment, and provided with generative organs, there exist also other smaller 
asexual polyps, which appear to preside essentially over the introduction of 
sea-water into the organism, and its expulsion, and which are, perhaps, at 
the same time the seat of an excrementitious secretion. These asexual in- 
dividuals possess, like the others, a body-cavity divided into chambers by 
eight septa, and a pyriform stomach furnished with two apertures. They 
are entirely destitute of tentaclovS, and in place of the eight ordinary mesen- 
teric filaments, no more than two are found applied over two consecutive 
septa. The cavity of the body of these individuals is always in communi- 
cation with that of the sexual individuals, but the manner in which this 
communication is established is liable to vary with the genera.” 
Proceedings of the Zoological Society . — During the past quarter the 
Zoological Society has been busy enough, and several valuable papers have 
been read at its various meetings. Among these we may direct attention 
to the following:— On May 14, Professor Huxley read a memoir on the 
classification and distribution of the birds belonging to his divisions 
