Echinoderms of Connecticut (1912) Echinoderms of Connecticut echinodermsofcon00coew Year: 1912 42 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. It is of interest to note that the loss of an arm does not cause even a temporary diminution in the rate of growth, the rest of the body increasing in size as rapidly as in the case of uninjured individuals. Even the loss of two arms has little effect. The lost arms are rapidly replaced if food is abundant, and in their regeneration grow faster than the others until the normal sym- metry of the body is restored. FIG. 3. Outlines of two starfishes
Echinoderms of Connecticut (1912) Echinoderms of Connecticut echinodermsofcon00coew Year: 1912 42 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. It is of interest to note that the loss of an arm does not cause even a temporary diminution in the rate of growth, the rest of the body increasing in size as rapidly as in the case of uninjured individuals. Even the loss of two arms has little effect. The lost arms are rapidly replaced if food is abundant, and in their regeneration grow faster than the others until the normal sym- metry of the body is restored. FIG. 3. Outlines of two starfishes of the same age ^2 weeks), showing difference in the rate of growth under the influence of different food supplies. (After Mead.) The age at which the starfish becomes sexually mature is also influenced by the rate of growth, for Mead has found that all starfishes with a length of ray of more than 50 mm. at the beginning of'the breeding season, in May, are sexually mature, while others, but 10 or 15 mm. long at the same date, do not deposit sexual products until the following year. Now the length of 50 mm. is reached by well nourished individuals when less than four months of age, so that it seems reasonable to con- clude that the well fed starfishes are readv to breed when a little «r less than one year old; that is, in June of their first year. The rate of growth is most rapid during the warmer months of the year, and may cease entirely during the winter. This is probably due in part to the smaller amount of food devoured, and in part to the development of the sexual products.
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