362 Prof. A. M. Mayer’s Experiments on the supposed 
provided with lunate eyes, between which in front superiorly are 
found two pyriform capsules nearly touching each other, and 
having implanted into them the very remarkable antenne. 
“The capsule, measuring about 0°21 millim., is composed of 
a horny substance, and is attached posteriorly by its pedicle, 
while anteriorly it rests upon a horny ring united with its fellow 
by a transverse fenestrated band, and to which it is joined by a 
thin elastie membrane. Externally it has a rounded form, but 
internally it resembles a certain sort of lamp-shade with a con- 
striction near its middle; and between this inner cup and outer 
globe there exists a space, except at the bottom or proximal end, 
where both are united. 
‘“‘The antennze are of nearly equal length in the male and the 
female. 
“In the male the antenna is about 1°75 millim. im length, 
and consists of fourteen joints, twelve short and nearly equal, 
and two long and equal terminal ones, the latter measuring 
(together) 0-70 millim. ach of the shorter joints has a fenes- 
trated skeleton with an external investment, and terminates 
simply posteriorly, but is encircled anteriorly with about forty 
papille, upon which are implanted long and stiff hairs, the 
proximal sets bemg about 0°79 millim. and the distal ones 
0:70 millim. in length; and it is beset with minute bristles iu 
front of each whorl. 
“ The two last joints have each a whorl of about twenty short 
hairs near the base. 
“In the female the joints are nearly equal, number but 
thirteen, and have each a whorl of about a dozen small hairs 
around the base. Here, as well as in the male, the parts of the 
antennz enjoy a limited motion upon each other, except the 
basal jomt, which, being fixed, moves with the capsule upon 
which it is implanted. 
“The space between the mner and outer walls of the cap- 
sule, which we term confidently the auditory capsule*, is filled 
with a fluid of moderate consistency, opalescent, containmg mi- 
nute spherieal corpuscles, and which probably bears the same 
relation to the nerve as does the lymph in the scale of the 
cochlea of higher auimals. The nerve itself of the antenna 
proceeds from the first or cerebral ganglion, advances toward 
the pedicle of the capsule in company with the large trachea, 
which sends its ramifications throughout the entire apparatus ; 
and penetrating the pedicle, its filaments divide imto two por- 
tions. The central threads continue forward into the antenna, 
and are lost there ; the peripheral ones, on the contrary, radiate 
* See figure, page 361. 
