. The Biological bulletin. Biology; Zoology; Marine biology. 252 JAMES B. DURAND after collection, and the rate of limb regeneration was measured to the following molt. Since the animals were collected at random, it is believed that all stages of the intermolt period were represented in the population at the beginning of the experiments. Therefore, Figure 1 illustrates limb regeneration which began at successive stages of the molt cycle. It is seen that the stages of limb regeneration are similar to those reported by Bliss (1956) for Gecarcinus. Thus, following autotomy there is a lag period b

. The Biological bulletin. Biology; Zoology; Marine biology. 252 JAMES B. DURAND after collection, and the rate of limb regeneration was measured to the following molt. Since the animals were collected at random, it is believed that all stages of the intermolt period were represented in the population at the beginning of the experiments. Therefore, Figure 1 illustrates limb regeneration which began at successive stages of the molt cycle. It is seen that the stages of limb regeneration are similar to those reported by Bliss (1956) for Gecarcinus. Thus, following autotomy there is a lag period b Stock Photo
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. The Biological bulletin. Biology; Zoology; Marine biology. 252 JAMES B. DURAND after collection, and the rate of limb regeneration was measured to the following molt. Since the animals were collected at random, it is believed that all stages of the intermolt period were represented in the population at the beginning of the experiments. Therefore, Figure 1 illustrates limb regeneration which began at successive stages of the molt cycle. It is seen that the stages of limb regeneration are similar to those reported by Bliss (1956) for Gecarcinus. Thus, following autotomy there is a lag period before any visible signs of regeneration occur; this period probably represents the time required for healing processes and the general mobilization of local growth. 3 0 20 DAYS BEFORE MOLT Figure 1. Limb regeneration curves for selected crayfish. processes. It is interesting that the length of the lag period (mean, 6 days) is essentially constant no matter when autotomy occurs during the intermolt period. Next, there occurs a period of basal growth, during which time the regeneration of the limb progresses rapidly. This stage is also essentially the same (the slopes are the same) no matter when it occurs during the intermolt period. The mean slope of the basal growth stage was 2.2, and 10-11 days were required for the completion of basal growth. Following basal growth, linear growth of the regenerating limb ceases, that is, it enters a period of plateau which lasts until near the end of the intermolt period. The limb has usually reached about 22% of the carapace length at this time. Ac- cording to Hodge (1956) differentiation of limb tissue continues during the period. 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 work.. Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890