532 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
each pulmonary segment shows a pair of stigma-like invaginations on 
the ventral median line; these fuse in a tube which opens into the 
cavity of the body and becomes connected with a group of cells evidently 
reproductive ; in the superior pulmonary segment these invaginations 
give rise to the “ plaque sexuelle” of authors, in the inferior segment 
to the gonads proper. In the two succeeding segments there are slight 
hints of similar formations. The authoress also sketches the state of 
the nervous, alimentary, and vascular systems. 
New Spiders from Southern Asia.* * * § — T. Thorell describes a dozen 
new species and three new genera, — Eurychoera (Lycosidae), Megullia 
(Oxyopidae), and Geminia (Heteropodidaa). 
New Hydrachnids.f — Herr F. Koenike describes six new species of 
the genus Hydrachna (0. F. Mull.) Hug. He also points out that the 
form described by Croneberg as H. globosa De Geer must be made into a 
new species, H. Cronebergi. 
Wine-Mite.:]; — Dr. E. L. Trouessart discusses Carpoglyplius passu - 
larum Robin, an Acarid which multiplies in the sweet wine of Grenache 
and similar kinds. It not only lives well but propagates rapidly (vivipar- 
ously), in spite of the large percentage of alcohol. It probably comes 
from raisins used in manufacture, as it does not occur on the fresh 
grape. In this connection its presence may have some legal interest. 
e. Crustacea. 
Peripheral Nervous System in Crayfish.§— Prof. 'J. Nusbaum and 
Herr W. Schreiber have studied, by means of the methylen-blue method, 
the sensory peripheral nervous system in the freshwater crayfish. Their 
conclusions are the following : — 
(1) There are bipolar sensory nerve-cells, lying more or less deeply 
beneath the surface, and sending distal processes into the setae (the Rath- 
Retzius type). 
(2) There is a more superficial plexus of nerve-cells lying close 
below the epithelium (Bethe), and consisting of (a) roundish cells with 
a proximal axis-process and numerous short processes ending below the 
roots of the setae ; (6) conical cells with a long proximal process and 
numerous dendritic processes; and (c) multipolar cells with numerous 
ramifying processes, among which an axis-process is not usually dis- 
tinguishable. 
(3) The axis-processes either enter directly into the larger nerve- 
branches, or unite with very long fibres which form a felt-work just 
below the epithelium and unite in larger nerve-branches. 
(4) The dendritic processes of the cells of the nerve-plexus often 
form very beautiful tree-like terminal ramifications, innervating setae, or 
ending on a bare surface. 
(5) There are three kinds of connections between the cells of the 
nerve-plexus — (a) by broad protoplasmic bridges, (b) by long thin un- 
branched processes running from cell to cell, and (c) by nervous ramifi- 
* Bihang Svensk. Veteusk. Akad. Handlingar, xxii. (1897) No. 6, 36 pp. 
t Zool. Anzeig., xx. (1897) pp. 394-8. 
t Comptes Rendus, cxxv. (1897) pp. 363-6. 
§ Biol. Centralbl., xvii. (1897) pp. 625-40 (8 figs.). 
