QUARTERLY CHRONICLE. 55 
ance of the cone and its fibrils depends on the amount of 
tension. The termination of the nerve in beetles is similar 
to that in the Batrachians, but there is no general similarity 
between the Articulata and Vertebrata in this respect. The 
axis cylinder presents no modification of structure or appear- 
ance in the three higher classes of Vertebrata, but spreads 
out in the form of a finely granular plexus, accompanied by 
an aggregation of minute globules. Whether these researches 
are confirmatory of Dr. Beale’s, M. Rouget does not say. His 
results seem certainly to agree better with those of our own 
countryman than with those of Kuhne or Kolliker. (‘Comptes 
Rendus,’ Nov. 21st, 1864.) 
A paper on the same subject as this will be found in 
the last number of ‘ Kolliker und Siebold’s Zeitschrift’ for 
this year, by Dr. Lehman, of Copenhagen, detailing the 
results of some important original investigations. 
The Embryology of Insects. By Dr. Aucust WIESEMANN. 
—Two very valuable papers on this subject have lately been 
published, one in the October number of Reichert’s ‘ Archiv,’ 
and the other occupying the whole of the July number of 
Kolliker’s and Siebold’s ‘ Zeitschrift.2. We have not space to 
notice the various details of microscopic and minute anatomy 
which are given by the author, but would just draw attention 
to the subject as one of great interest. Dr. Weismann’s 
papers are profusely illustrated. 
On some peculiar Structures in the Seminal Fluid of Janthina. 
By Frirz Miier. (‘ Wiegman’s Archiv,’ 1863, p. 179.)— 
During some observations made on the shores of the Mediter- 
ranean the author detected numerous little bodies, apparently 
possessed of head and tail, freely swimming in the seminal 
fluid of Janthina. He at first considered them as parasites, 
but on a subsequent examination found that their filamentous 
appearance and movement was due to the aggregation of 
zoosperms ; and hence he concludes that they are sperma- 
tophora. The question, however, is one admitting of further 
investigation, likely to be attended with interesting results. 
(See ‘ Ann. and Mag. Nat. Hist.,’ Dec., 1864.) 
On the Muscular Submucous Layer of the Intestine of 
Mammifers. By M. Lovis Fascr. (‘ Robin’s Journal.’)— 
The disposition of the muscular layers of the intestines, as 
shown by M. Fasce, is as follows :—1. Muscular fibres placed 
beneath Lieberkuhn’s tubes, surrounding them partly, always 
disposes in the same direction. 2. Connective tissue sepa- 
rating the above from, 3, circular muscular fibres. 4. 
Longitudinal fibres. This layer is three times as thick as 
