. Zoology : for students and general readers . Zoology. 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
. Zoology : for students and general readers . Zoology. 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
Size: 1102px × 2267px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
