. Elements of zoölogy. Zoology. Fig. 82.—Tail of a cray-fish, showing flattened append- ages for swimming. Fig. 83.—Ideal section of prawn, showing : s, stomach, below this the mouth ; /, liver; », intestine; //, heart; g, chain of ganglia or nerve-masses; hg, head-ganglia. by the oesophagus into the large stomach s j the latter is provided with crushing teeth, by which food is still further masticated, then passing through a strainer at the posterior end, and so into the intestine 2, that leads into the telson. The liver / is very large and of a dark-green hue. Respiration.—The higher crustac
. Elements of zoölogy. Zoology. Fig. 82.—Tail of a cray-fish, showing flattened append- ages for swimming. Fig. 83.—Ideal section of prawn, showing : s, stomach, below this the mouth ; /, liver; », intestine; //, heart; g, chain of ganglia or nerve-masses; hg, head-ganglia. by the oesophagus into the large stomach s j the latter is provided with crushing teeth, by which food is still further masticated, then passing through a strainer at the posterior end, and so into the intestine 2, that leads into the telson. The liver / is very large and of a dark-green hue. Respiration.—The higher crustaceans breathe by gills, the plume-like object in Fig. 81. They are attached to the base of the legs, and are protected by the carapace or shelly covering of the cephalo-thorax. Water containing air reaches the gills by flowing under the edge of the car- apace back of the great claws. In the oyster (Fig. 55), we saw that cilia kept up a current over the gills, but here there is a curious appendage attached to the base of the second pair of maxillipeds (Fig. 81,/), called the "gill-. 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 Holder, Charles Frederick, 1851-1915; Holder, Joseph Bassett, 1824-1888, joint author. New York : D. Appleton and company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
