. Contributions to Canadian biology and fisheries. Fisheries; Marine biology. I II III IV to ; 12 The table below shows the comparative measurements in millimetres of the four zoea stages. Zo'ea Stages Distance between tips of Ros- tral and Dorsal spines. Distance of Rostral tip from anterior border of eye. Length of Dorsal Spine. Length of Abdomen from pos- terior border of Carapace to end of Telson fork. • Length of Lateral Spine. Length of Abdominal Segments Number of plumo
. Contributions to Canadian biology and fisheries. Fisheries; Marine biology. I II III IV to ; 12 The table below shows the comparative measurements in millimetres of the four zoea stages. Zo'ea Stages Distance between tips of Ros- tral and Dorsal spines. Distance of Rostral tip from anterior border of eye. Length of Dorsal Spine. Length of Abdomen from pos- terior border of Carapace to end of Telson fork. • Length of Lateral Spine. Length of Abdominal Segments Number of plumose setse on exopodites of First and Second 11 on mxp. 1 Maxillipeds. 4 6 8 12 on mxp. 2 THE MEGALOPS The megalops (Text-fig. II) or post-larval stage presents an appearance quite different from the zoea stages described, but, as we have seen, there is a gradual approach in the structure of some of the appendages in the zoea stages to that of the megalops, and no new appendages appear in the megalops that. Fig. II are not present, at least in a rudimentary form, in the zoea stages. The chief changes in structure are correlated with the changed habit of the creature, which now becomes to some extent demersal. Some parts become functional for the first time, while other parts undergo a change of function. The pereio- pods for example, which appeared as buds in Zoea I, showed a slow growth in 346. 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 Biological Board of Canada. Contributions to Canadian biology and fisheries; Biological Board of Canada. Toronto [etc. ]
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