. Zoology for high schools and colleges. Zoology. Pig. Zi9.—Gamp8(myx JlmbHatus ot European coal meaenres, Hi tunes natnral tize. and limbs like Amphipods. In the Isopods the body is flat- tened and the head rather broad. Fig. 251 is a dorsal view of Serolis Gau- dichaudi Audouin and Edwards, with the two pairs of antennae 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. 252 represents a trans- verse section of the body, showing the mode of insertion of the legs, and the equ
. Zoology for high schools and colleges. Zoology. Pig. Zi9.—Gamp8(myx JlmbHatus ot European coal meaenres, Hi tunes natnral tize. and limbs like Amphipods. In the Isopods the body is flat- tened and the head rather broad. Fig. 251 is a dorsal view of Serolis Gau- dichaudi Audouin and Edwards, with the two pairs of antennae 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. 252 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. Fig. 264 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. 250, Idotma, and Pig. 251, that of Serolis.) The digestive canal is straight, consisting Pig. 250—Nervous of a short OBSophagus, a membranous stom- rwo™-Dra1vn*b/j! ach, and usually a short tubular intestine; s. Kingsiey. ^j^g jj^gj, Qongigting 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, H. Holt and Company
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
