. Zoology : for students and general readers . Zoology. 306 ZOOLOGY. and Europe, which may be called Anthracarida, and which have antennse and tails like shrimps, but the body. Fig. 254.— Gampsmyx fimlniatus of European coal meaenres, 214 times natural eize. and limbs like Amphipods. In the Isopods the body is flat- tened and the head rather broad. Fig. 256 is a dorsal view of Se7-oUs Gau- dichaudi Audouin and Edwards, with the two pairs of antenna? and pointed sides of each thoracic segment, dissected to show the nervous system, the two pairs of antennal nerves; the optic nerves {op) sent to
. Zoology : for students and general readers . Zoology. 306 ZOOLOGY. and Europe, which may be called Anthracarida, and which have antennse and tails like shrimps, but the body. Fig. 254.— Gampsmyx fimlniatus of European coal meaenres, 214 times natural eize. and limbs like Amphipods. In the Isopods the body is flat- tened and the head rather broad. Fig. 256 is a dorsal view of Se7-oUs Gau- dichaudi Audouin and Edwards, with the two pairs of antenna? and pointed sides of each thoracic segment, dissected to show the nervous system, the two pairs of antennal nerves; the optic nerves {op) sent to the compound eyes. Fig. 257 represents a trans- verse section of the body, showing the mode of insertion of the legs, and the equality in the tergal and sternal sides of the body. Eig. 259 represents a gill. In the common pill-bug {Porcellio) aerial respiration is per- formed by respiratory cavities situated in the abdomen. In Tylos similar cavities are filled with a multitude of branching coeca, serving for aerial respiration, thus antici- pating the tracheary system of insects. The nervous system is quite simple. (Fig. 255, Idotwa, and Fig. 256, that of Serolis.) The digestive canal is straight, consisting Fig. S55.—Nervous of a short ossophagus, a membranous stom- toT/™—DrawnTy'j' ach, and usually a short tubular intestine; s. Kinssiey. ^j^g liver Consisting of several short coeca. In Serolis Gaudichaudi the stomach is somewhat pear-. 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
