220 QUARTERLY CHRONICLE. 
Herr Hugo von Mohl contributes a very lengthy paper 
“On a new Adaptation of the Screw Micrometer,’ which 
appears to be of considerable importance; for details we 
must refer our readers to the ‘ Archiv.’ 
The paper of Dr. Richard Greef, of Bonn, ‘ On the 
Nervous System of the Arctiscoida (Tardigrada, Doyere),” is 
perhaps the most interesting in the number. It is beautifully 
illustrated by a large drawing of the disposition of the 
nervous system in Arctiscon Milnei and smaller detailed 
figures. We hope to give a more lengthy notice of this 
paper in our next number. 
“On the Histology of the Cestodea,’ by Dr. Edward 
Rindfleisch. The author has investigated the minute struc- 
ture of the cestoid worms in a very careful manner ; he enume- 
rates four kinds of corpuscles which occur in the homoge- 
neous substance of these animals, which are distinguished by 
the arrangement of their substance in layers, by their calci- 
fication, and the action of carmine on them when treated 
with that dye. They are—Ist. Corpuscles which become 
dyed intensely red, are entirely homogeneous, and contain no 
lime. 2nd. Corpuscles which become dyed blood-red, with 
concentric layers, and are also free from lime. 3rd. Corpus- 
cles becoming dyed blood-red, with concentric rings, in the 
centre of which a clear shining spot shows the commence- 
ment of the calcification. 4th. Corpuscles (ringed or homo- 
geneous), which are free from dye and are entirely calcified. 
Another paper by the editor, entitled “A Contribution to 
the Knowledge of the Light-giving Organs of Lampyris 
splendidula ;’? one by Fritz Miller, of Desterro, “ On the 
Marginal Vesicles of Aglaurepsis ;’ and a notice of Thiersch 
and Miiller’s injecting fluids, complete the list of original 
papers in the first number of this very valuable journal. We 
trust our new contemporary may meet with its well deserved 
success. 
Archiv fur Naturgeschichte. Third Part, 1864.—This perio- 
dical contains the second part of a paper by Dr. Richard 
Greef, on “‘ The Bell-like Uterus and the Ovary of Echino- 
rhynchus.”’ We have not yet seen the later numbers of the 
journal. 
The Archivo per la zoologia, l’anatomia, e la fisiologia, 
published at Modena, and edited by Professor Giovanni 
Canestrini, of that university, contains the continuation and 
conclusion of a valuable paper by Sign. E. Oehl, “ On 
the Alteration and on the process of Renvvation of Cut 
Nerves in the Frog,’ illustrated by two plates. Those of our 
readers interested in the physiology of the nervous system, 
will find this a valuable contribution to science. 
