THE EVIDENCE OF THE OLFACTORY APPARATUS 223 
In order to convey to my readers the antenns-like character of the 
camerostome in Galeodes (Fig. 101), and its position, I give a figure 
(Fig. 94) of the organ from its dorsal aspect, after removal of the 
cheliceree and their muscles. A side view of the same organ is given 
in Fig. 95 to show the feathered termination of the camerostome, 
and the position of the dependent accessory portion (/.2.) (Crone- 
berg’s ‘untere Anhang’) with its single long antenna-like feather. 
In both figures the alimentary canal (ai.) is seen issuing from the 
conjoined supra- and infra-cesophageal mass. 
As is seen in the figures, the bilateral character of the rostrum, as 
Croneberg calls it, is apparent not only in its feathered extremity 
but also in its chitinous covering, the softer median dorsal part (left 
pent 
Fig. 95.—LaTERAL ViEW OF BRAIN AND CAMEROSTOME OF GALEODES. 
gl. supr. @s., supra-cesophageal ganglion; gl. infr. ws., infra-cesophageal ganglion. 
The rest of the lettering same as in Fig. 94. 
white in figure) being bounded by two lateral plates of hard chitin, 
which meet in the middle line near the extremity of the organ. In 
all the members of the scorpion group, as is clearly shown in Crone- 
berg’s figures, the rostrum or eamerostome is built up on the same 
plan as in Galeodes, though the antenna-like character may not be 
so evident. 
When we consider that the first pair of antenne in the crustaceans 
are olfactory in function, Croneberg’s observations amount to this— 
In the arachnids and their allies the first pair of antenne form 
a pre-oral passage or tube, olfactory in function; the small mouth, 
which opens directly into the pharynx, being situated at the end 
of this olfactory passage. 
