124 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Crustacea of the ‘ Caudan ’ Expedition. — M. J. Bonnier * * * § gives an 
account of the Hedriophthalmia collected by Prof. Koehler in his deep- 
sea dredgings in the Bay of Biscay. Of the fifty-two species collected 
many are new, but we notice that a number of them are based on single 
specimens, and many of the exanqfies are said to be considerably injured.- 
Specimens were taken from depths varying from 200 to 1700 metres. 
There are three new genera of Cumacea, two of Isopoda, and two of 
Amphipoda. 
In conclusion the author describes a new Copepod of the family 
Choniostomatidse, which was taken from the branchial apparatus of a 
Cumacean ; this is, it would seem, the first time that a member of this 
family has been observed to lead a parasitic life. 
The Schizopoda and Decapoda j* found during the expedition were 
entrusted to M. M. Caullery, who has distinguished forty-eight species, 
five of which are new and representative of two new genera and one 
subgenus. A number of the already described forms have not till now 
been known to inhabit the Bay of Biscay. 
The Copepoda J generally fell to the care of M. E. Canu, who reports 
on a small but interesting collection, which is attractive as leading to the 
hope that a large number of interesting additions will be made to the 
“ French Oceanic Fauna,” when a more complete and methodical study is 
made of the pelagic life of the French shores. Neoscolecithrix is a new 
genus formed for N. Koehleri sp. n. 
Embryonic Nervous System of Crustacea.§ — M. N. de Zograf has 
made a fresh investigation of this system in the Nauplius of fresh-water 
Oopepods by the aid of the method of Ramon y Cajal. He has found by 
it, under the chitinous covering layer, special cells arranged in the same 
way and in the same places as he found by the aid of methylen-blue. 
These cells are continued into long nervous filaments, which are con- 
nected with one another by very thick branches, and which terminate in 
the sub- oesophageal ganglion. In one exceedingly successful preparation 
the author can demonstrate two rows of subcuticular cells, connected 
with one another by the branchings of their filaments. 
Entornostraca of Lake Mezzola.|| — Dr. N. Rizzardi gives a list of 
these in an appendix to Prof. P. Pero’s recent monograph on the lake in 
question. There are eight pelagic species, including Linceus sjphsericus 
and Cypris ovum, said to be rare in Italy. The genus DapJinia seemed 
to be unrepresented. 
Revision of Cladocera.^ — M. J. Richard has undertaken'and completed 
a work for which he will receive the thanks of microscopists. Dealing, 
as it does, freely with details, we cannot do more than call the attention 
of our readers to it. The extent of the author’s work may be somewhat 
estimated by the fact that he cites no less than 587 titles in his biblio- 
graphy, which is brought down to 1896. 
* Resultats Scient. de la Campagne du ‘ Caudan,’ fasc. iii. (1896) pp. 527-689 
<13 pis ). 
f Op. cit., ii. pp. 365-419 (5 pis.). X Op. cit., ii. pp. 421-37. 
§ Comptes Rendus, cxxiv. (1897) pp. 201-3. 
II Boll. Soc. Rom. Stud. Zool., v. (1896) pp. 126-9. 
H Ann. Sci. Nat., ii. (1896) pp. 187-363 (6 pis.). 
