. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 772 CRUSTACEA. led to their ordinary denomination of maxil- lary limbs or feet (Jigs. 408, 409, 410.) Fig. 408. Fig. The forms and dimensions of these organs vary considerably, and are obviously in harmony with their uses; they are by so much the shorter and flatter as they are more peculiarly appor- tioned to the oral apparatus, a disposition which is nowhere more conspicuously displayed than among the short-tailed De- capods, in which they resemble horny laminae, armed with teeth or serrae of various sizes, and s
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 772 CRUSTACEA. led to their ordinary denomination of maxil- lary limbs or feet (Jigs. 408, 409, 410.) Fig. 408. Fig. The forms and dimensions of these organs vary considerably, and are obviously in harmony with their uses; they are by so much the shorter and flatter as they are more peculiarly appor- tioned to the oral apparatus, a disposition which is nowhere more conspicuously displayed than among the short-tailed De- capods, in which they resemble horny laminae, armed with teeth or serrae of various sizes, and supporting an articulated palp (6, fig. 408) as well as a Jiulic Uif'orm or whip-shaped appendage (c), which penetrates into the interior of the branchial cavity. The last pair of all (fig- 410) presents Fig. 410. amounts to three pairs, and in the Phyllo- soma to two pairs only. To conclude, the Limuli, a group of Crusta- ceans of the most singular conformation, are at the bottom of the scale in this respect; for in them (Jig. 411) the anterior ambulatory extre- mities themselves surround the mouth, and their basilar articulations perform the office of jaws. The organs of which we have just made mention, are, according to the modifications they undergo, adapted in a more or less espe- cial manner to seize, to hold fast, and to comminute the alimentary matters upon which the animal lives. Moreover the thoracic ex- tremities in many species are themselves calcu- lated to accomplish one or all of these offices with various degrees of success, according to their form, their extent, and the mode in which Fig. 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 Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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