. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. 238 PHYSIOLOGY AND MORPHOLOGY OF ANIMALS. fish, but different in the two cases. The squid is pro- vided with a horizontal, arrowhead-shaped caudal fin (not shown in the diagram), which is not flapped from. Fig. 153.—Diagram showing geDeral structure of a squid : mc, the mantle cavity ; s, the siphon ; g, gills ; z'0, ink bag; isk, internal shell; e, eye; oe, oesophagus ; k, kidney. The arrows show the direction of currents. side to side, as in fish, nor up and down, in the man- ne
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. 238 PHYSIOLOGY AND MORPHOLOGY OF ANIMALS. fish, but different in the two cases. The squid is pro- vided with a horizontal, arrowhead-shaped caudal fin (not shown in the diagram), which is not flapped from. Fig. 153.—Diagram showing geDeral structure of a squid : mc, the mantle cavity ; s, the siphon ; g, gills ; z'0, ink bag; isk, internal shell; e, eye; oe, oesophagus ; k, kidney. The arrows show the direction of currents. side to side, as in fish, nor up and down, in the man- ner of whales, but locomotion is effected by waves propa- gated backward or forward—in the one case giving rise to gentle forward, in the other to gentle back- ward motion. These grace- ful movements may be ^-71_ watched in an aquarium. The short-bodied cut- tlefish, on the contrary, uses its long, flexible, mus- cular arms for crawling on Fig. 154.—Diagram of a medusa :n », the bottom, or even for nerve; »z, mouth ; st, stomach \rt. .. radiating tubes. climbing up 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 LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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