ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
35 
in tlie adult. Two hundred and fifty-four specimens of the male of the 
crab had been collected in 1892-3 and were available for examination, 
while 493 individuals were collected at Plymouth in January of the 
present year. The results fully confirmed those arrived at for the young. 
It is not possible at present, of course, to say whether we have here 
indications of a permanent change, or whether there is mere oscillation 
such as, for all we know, may be constantly going on in the relative 
dimensions of the various parts of the members of all species. It is clear 
that a similar set of measurements must be taken two or three years hence. 
Lucifer Reynaudi.* — Herr B. Rosenstadt has made a study of the 
organisation and post-embryonic development of this very interesting 
decapod. After treating of its general form and integument, the author 
describes in considerable detail the extremities, the musculature of the 
body, and the nervous system. The intestine and its appended glands 
are also fully dealt with. The condition of the specimens did not allow 
him to dissect the blood-vessels. Special attention is called to the com- 
plete want of gills in Lucifer. With regard to the excretory organs, 
it is of interest to know that they have some resemblance to the glands 
described some time since by Mr. E. J. Allen, in the axis of the gills 
of Palsemoneies varians. In conclusion, the structure and development 
of the reproductive apparatus is dealt with. The author finds that 
the vasa efferentia are morphologically modified portions of the testis. 
The two spermatophoral glands may be referred to that portion of the 
rudiment of the generative apparatus which connects the rudiment of 
the testis with the ejaculatory duct. The azygous condition of the testis 
and its site below the intestine are secondary morphological peculiarities 
which appear in the course of post-embryonic development. 
At the end of his paper the author calls attention to a case of com- 
plete hermaphroditism. 
Peripheral Nervous System: | — Dr. B. Nemec describes the peri- 
pheral ganglionic strands which occur in certain Isopods. They are 
especially well seen in Titanethes, a blind genus. A thoracic segment 
shows a central ganglion directly connected by a nerve with the ventral 
cord, and from the central ganglion branches go to two lateral ganglionic 
plexuses lying under the hypodermis. Similar structures occur in 
Orcliestia among Amphipods. 
Visceral Nervous System of some Isopods.f — Dr. B. Nemec finds 
that Isopods ( Porcellio , &c.) have an anterior and a posterior visceral 
system, the former innervating oesophagus, gizzard, and hepatopancreas, 
the latter supplying mid-gut and bind-gut. The anterior starts from 
the circumoesophageal commissure, has a ganglion near the upper lip, 
another in front of the gizzard, and so on. The posterior system 
arises from the fused post-abdominal ganglia, and is without any gang- 
lionic differentiation. 
* Development of Asellus.§ — Prof. L. Roule adds to his previous 
embryological studies of Crustacea an account of the development of 
Asellus ciquaticus. In spite of the amount of yolk, segmentation is virtually 
* Zool. JB. (Abth. Anat.), ix. (1896) pp. 427-76 (6 pis.). 
t Anat. Anzeig., xii. (1896) pp. 434-8 (2 figs.). 
% Zool. Anzeig., xix. (1896) pp. 477-9. 
§ Ann. Sci. Nat. Zool., ser. viii., i. (1896) pp. 163-96 (3 pis.). 
