1885.] Entomology, 177 
Each of the sensory processes is entered by a nerve which 
immediately divides into two branches, each covered with gan- 
glionic cells which are distributed in two groups, the anterior 
one consisting of considerably smaller cells than the posterior 
ones; at the distal extremity the nerve-fibres again collect into a 
bundle and form the termination of the organ; that these fibers 
are differently constituted from those which enter the ganglion 
rom above is shown by the fact that their behavior to staining 
reagents is different; the sensory process is often at the free 
extremity so that a direct communication is established between 
these nerve-endings and the outer world. 
A structure essentially similar to this is found in Vespa, but is 
differently construed by Hauser; according to him the posterior 
group of cells is not present, since he only figures one nucleus 
with several nucleoli, however, while the anterior group of smaller 
cells has escaped his attention; accordingly the conclusion to 
which Hauser has arrived at is that the whole sensory structure 
is a single cell; whereas in reality it consists of a great number 
of cells.—/ourn. R. Micr. Soc., August, 1884. 
Porson APPARATUS AND Poison oF Scorpions.—J. Joyeux- 
Laffuie, from his own studies and a consideration of what has been 
discovered by other naturalists, comes to the conclusion that the 
poison organ of the scorpion (ZL. occitanus) is formed by the sixth or 
last somite of the post-abdomen, which terminates by a sharp pro- 
cess, at the extremity and sides of which are two oval orifices by 
which the poison escapes. * There are two secreting glands, each 
of which opens by an excretory duct to the exterior. Each 
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