. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRUSTACKAXS IX ( •. I ( •!' I K RTS TU5KS. IO5 the female Polyonyx had left the tube and was on the surface of the sand. The other three crustaceans stayed within until July 27, at about p. m., when the male Polymyx emerged. The water in the jar at that time was murky, but did not have a very bad odor. On the morning of July 29 the water had some odor; the Polyonyces were dead on top of the sand and the PinnixcE had left the tube but were alive and active. The crabs in experiment 2 were the largest obtainable and t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRUSTACKAXS IX ( •. I ( •!' I K RTS TU5KS. IO5 the female Polyonyx had left the tube and was on the surface of the sand. The other three crustaceans stayed within until July 27, at about p. m., when the male Polymyx emerged. The water in the jar at that time was murky, but did not have a very bad odor. On the morning of July 29 the water had some odor; the Polyonyces were dead on top of the sand and the PinnixcE had left the tube but were alive and active. The crabs in experiment 2 were the largest obtainable and the apertures at the ends of the tube tips were of medium size. They seemed to have little difficulty in passing in or out, though one would not think so at first glance. Pinnixa walked in sideways; Polyonyx extended its chelse and one of them pre- ceded the body, the other followed. Locomotion outside the tubes was first studied in a large flat dish containing sea water. Pinnixa did not use its last leg when walking forward, but when going sideways used all the walking. 4 FIG. i. Diagrams to represent the method of locomotion used by Polyonyx when resting on its setal fringe with its body against some object. legs, except the chelipeds, which were hugged close against the body; it was never seen to move backward. Polyonyx usually moved backward when in the open and sideways along the sides of the dish. In the latter situation it always faced toward the center of the dish, or, if in haste, stood with its ventral surface against the side of the dish and walked along on the tips of its chelipeds and the bristles along their outer edges (Fig. i). It very much hurried an animal sometimes turned on its back and flapped its abdomen, thus swimming slowly. \Yhen placed in a vertical glass tube filled with sea water Polyonyx kept from falling by bracing the fringe of bristles on the chelipeds and the second and third walking legs forward; the fourth leg serving as a prop behind (Fig.
Size: 4407px × 567px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
