34 QUARTERLY CHRONICLE. 
represents the sexually mature form. 4. These stages of de- 
velopment are marked by the stripping off of the skin; there 
are therefore eight corresponding moults. 5. The mandibles 
arise first in the second stage, as powerful j ek -prolongations 
at the basal joint of the mandibular foot. 6. Only the hinder 
antenne already possess at the youngest age the complete 
jointing and figure of the sexually mature animal. 7. In the 
second stage the anterior maxille and anterior feet, except 
the antennz and mandibles, are attached. 8. The maxillze of 
the second pair originate first in the third stage, consequently 
later than the following pair of jointed bodies, distinguished 
as the first foot. 9. The maxillee of both pairs and the hinder 
foot present in their first appearance a nearly corresponding 
form as a triangular plate running out into a little hook. 
10. The anterior feet proceed from the top to the base in 
their jointing. 11. The abdomen gives rise to two long furcal 
joints. 
: Dr. Claus also contributes a paper “ On the Sexual Differ- 
ences in Halocypris.” 
A very lengthy and exhaustive memoir also appears from 
Professor Wilhelm Keferstein, entitled ‘‘ Contributions to the 
Anatomical and Systematic Knowledge of the Sipunculide,” 
which, though perhaps not a microscopical paper, will doubt- 
less be found of much value by the readers of this Journal. 
A complete résumé is given of all that is known of the ana- 
tomy of these doubtful annelids, and the known species dis- 
cussed, while many new forms are added to the list and new 
anatomical details described 
The same indefatigable naturalist contributes a paper on 
the “ Anatomy of Janella bitentaculata, Q. et G., of New 
Zealand. 
Herr Mecnikow has a paper “ On some little-hnown Lower 
Animals,’ in which he deals with the anatomy, &c., of 
Chetonotus, Chetura, Icthydium, and others. 
Perhaps the most valuable paper in the quarter’s ‘Zeitschrift’ 
is that by Dr. Hermann Dorner, “On the genus Branchiobdella 
of Odier.’ In this paper the author deals in a most able 
manner with the anatomy of Branchiobdella and its allies, 
and discusses the homologies of its organs and those of the 
genera investigated by Claparéde, Kélliker, Herring, and 
others. 
Dr. Leonard Landois publishes the fourth part of his 
monograph “ On the Lice which infest Men.’ In this part he 
treats of the Pediculus capitis, and also reverts to Pthirius 
inguinalis. 
We avail ourselves of a short translation of a paper by 
