ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
735 
The histology of the nerve-end apparatus is essentially the same as 
that which the author has already described for Myriopods and Insects ; 
he thinks we must exercise great caution in assigning functions to the 
dermal sense-organs, as their structure differs essentially from that of 
our own sense-organs, and they may possess senses entirely unknown 
to us. 
Motor Manifestations of Crustacea.* — Dr. J. Demoor, after a 
historical introduction, gives an account of his experiments on Paldemon 
serratus. He finds that the fibres of the cerebral nerves do not cross to 
any considerable extent ; the commissural fibres which connect the two 
halves of the supra-oesophageal ganglion have but little importance ; each 
cephalic nerve ends partly in an independent nerve-centre, and each 
sends off a bundle of fibrils into the lateral ganglion. In the ventral 
cord, some fibres of the afferent nerve traverse the ganglion, and pass into 
the median region of the symmetrical ganglion. Fibres given off from 
the internal surface of the ganglion, take part in the formation of part 
of the transverse commissure ; these curve at right angles, so as to become 
longitudinal, and pass towards the large internal nerve-cells of the 
ganglion of the same side. The number of fibres increases the more 
anterior the section ; they predominate in the superior part of the chain, 
and are continuous with the fibres of the circum-oesophageal commissures. 
The author also gives an account of some experiments on the nervous 
system of Crabs made by means of sections, and the injection of various 
drugs. 
Post-embryonic Development of Gonoplacidse.j — Dr. G. Cano 
describes the larval stages of Brachynotus and Gonoplax. The former 
genus exhibits marked affinities with some Grapsidse — Pachygrapsus and 
Nautilograpsus. As Cano was unable to examine the first larval stages 
of Gonoplax, he can give no verdict as to its systematic position. 
Antennary Gland of Lucifer Reynaudii.J — Prof. C. Grobben has 
made a careful examination of the antennary glands of this strange 
Decapod. That on the right side has an elongated terminal saccule 
near its hinder end and on the ventral surface there arises a constricted 
neck-like intermediate piece which leads to the urinary canaliculus. 
This at first runs parallel with the terminal saccule, and then makes 
a bend upwards and again descends to the ventral side ; it again 
makes an upward and a downward turn and finally passes into a 
narrow canal, the ureter ; this last traverses the conical excretory papilla 
as far as the tip, where it finds its orifice. The left antennary gland 
has, in general, the same arrangements as the right ; but the several 
parts of the canaliculus occupy different positions. With regard to 
minute structure, the author observes that the terminal saccule is formed 
of an epithelium, the cells of which are generally flat, but sometimes 
make rounded projections into the lumen of the sac. The cell-contents 
are granular, and the nucleus, as compared with those of the renal- 
canal-cells, is small. These cells are set on a basal membrane, which 
* Arch. Zool. Exper. et Gen., ix. (1891) pp. 191-227. 
t Atti R. Accad. Sci. Torino, xxvi. (1890-91) pp. 639-18 (1 pi. not published in 
this part). 
