50 PBOGEESS OF MICROSCOPICAL SCIENCE. [^jTu^nIi,Syi?S 
■wticli is parasitic on Cydippi, and which was studied by MM. Claparede 
and Panceri. He gives a magnified coloured figure of the larva of 
the animal, and proposes to call it Alciope Pancerii. — Siebold and 
KoUiker's Zeitschrift. May. 
Crustacea Parasitic on Ascidians. — The above-named naturalist, 
Herr Buchholz, has published a magnificent memoir on these animals, 
in the May number of Siebold and Kolliker's Zeitschrift. It minutely 
describes a multitude of forms, and is accompanied by seven folding 
plates, giving handsome enlarged coloured illustrations of some very 
singular crustacean parasites. 
Development of the Organs of Generation in Phallusia. — M. Paul 
Stepanoff has published a short account of the development of the 
reproductive system in Phallusia. A quarto plate illustrates the 
paper. — Bulletin de VAcademie Imperiale des Sciences de St. Petershourg, 
t. XIII. 
Comparative Embryology. — Professor Metschnikow is publishing a 
sort of melange of his observations on development. In the Bulletin 
of the St. Petersburg Academy above cited he describes his researches 
on the following : — Metamorphoses of Suncularia ; Development of 
Ophiolepis squammata ; Metamorphoses of Ophiuridce ; Metamorphoses 
of Nemertes ; Development of Bothrocephalus prohoscideus ; The 
Larva of Botryllus ; On the Development of Ascidians — in describing 
this, he refers to a structure which he thinks corresponds to the 
Chorda dorsalis of Vertebrates ! — On the Embryology of Scorpions. 
Structure of the Wing in Orthoptera. — M. de Saussure concludes 
his paper on this subject in the Annates des Sciences Naturelles, t. X., 
May. The author here sums up the conclusions he draws from his 
observations. These, however, are hardly of interest to microscopists, 
as they deal nearly solely with the methods in which the wing is 
folded under the elytron. 
Anatomy of Perichceta. — Those interested in the structure of the 
earth-worm group will do well to read a paper " On the Anatomy of 
Two Species of the genus Perichaeta " by M. Leon Vaillant, in the 
last Annates des Sciences Naturelles. The anatomy is tolerably fully 
stated. The cerebral ganglion resembles that of the earth-worm, but 
the division into two parts is less distinctly marked. The digestive 
apparatus is, he says, extremely like that of the earth-worm. Herma- 
phroditism is the rule. 
The Adenoid Tissue of the Nasal Part of the Pharynx is an excellent 
paper in the Journal de VAnatomie (June), by Professor Luschka, of 
Tubingen. 
The Mucus of the Arch of the Pharynx is also a good, though brief, 
paper in the same journal, and by the editor, M. Ch. Kobin. 
The Structure of the Axis-cylinder of Nerve. — According to M. 
Grandry's late observations, the axis-cylinder is not a uniform, homo- 
geneous filament, but is composed of a number of discs of two kinds, 
alternating with each other, and arranged end to end. — See Eobin's 
Journal, June. 
The Proliferation of the Connective Elements of the Perivascular Canals 
of the Central Nervous System in Children is a paper of two or three 
pages by M. Lupine in the Archives de Physiologie for June. 
