. The crayfish : an introduction to the study of zoology . Crayfish. 220 THE MORPHOLOGY OF THE COMMON CRAYFISH. processes, and the disposition of the vascular canals in its interior gives it the appearance of being radially striated. The setae, so abundant in the adult, are very scanty in the newly hatched young; and the great majority of those which exist are simple conical prolongations of the un-. FlG. 60.—Astaeus fluviatilis.—Newly-hatclied young ( x 6). calcified cuticle, the bases of which are not sunk in pits and which are devoid of lateral scales or processes. The young animals are fir
. The crayfish : an introduction to the study of zoology . Crayfish. 220 THE MORPHOLOGY OF THE COMMON CRAYFISH. processes, and the disposition of the vascular canals in its interior gives it the appearance of being radially striated. The setae, so abundant in the adult, are very scanty in the newly hatched young; and the great majority of those which exist are simple conical prolongations of the un-. FlG. 60.—Astaeus fluviatilis.—Newly-hatclied young ( x 6). calcified cuticle, the bases of which are not sunk in pits and which are devoid of lateral scales or processes. The young animals are firmly attached to the ab- dominal appendages of the parent in the manner already described. They are very sluggish, though they move when touched ; and at this period they do not feed, but. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Huxley, Thomas Henry, 1825-1895. London : Kegan Paul, Trench, Tru?bner & Co.
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