An Introduction to the Study of Zoology

Cover An Introduction to the Study of Zoology
An Introduction to the Study of Zoology
Th Huxley
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25, an) connected with the brain, by means of the very curious auditory sacs (fig. 26, A, au) which are lodged in the basal joints of the antennules.
Each of these joints is trihedral, the outer face being con- vex ; the inner, applied to its fellow, flat ; and the upper, on which the eyestalk rests, concave. On this upper face there is a narrow elongated oval aperture, the outer lip oi which is beset with a flat brush of long close-set setae, which lie horizontally over the aperture, and effec
...tually close it. The aperture leads into a small sac (au) with delicate walls formed by a chitinous continuation of the general cuticula. The inferior and posterior wall of the sac is raised up along a curved line into a ridge which projects into its interior (fig. 27, A, r). Each side of this ridge is beset with a series of delicate setae (as), the longest of which measures about -^th of an inch ; they thus form a longitudinal band bent upon itself. These auditory setae project into the fluid contents of the sac, and their apices are for the most part imbedded in a gelatinous mass, which contains irregular particles of sand THE EAR OF THE CRAYFISH.

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