. The Biological bulletin. Biology; Zoology; Marine biology. CRAYFISH PROECDYSIS 161 Table I Stage designations assigned to premolt events in different crustaceans 1 2 3 4 5 6 7 8 9 10 11 Membranous layer present C4 C4 C4 Activation of epidermis & hepatopancreas Do Regenerating limb buds begin rapid growtli Do Gastroliths begin to be formed Do Do I'^pidermis separates from old cuticle Di'a D„ D2 Do Do Di New setae begin formation as epidermal Di Di' Di Di'a Di' Di' Di' C4 invagination New setal invagination reaches maximum Di Di" Di Di" Di" Di'" D2 depth All morphologic
. The Biological bulletin. Biology; Zoology; Marine biology. CRAYFISH PROECDYSIS 161 Table I Stage designations assigned to premolt events in different crustaceans 1 2 3 4 5 6 7 8 9 10 11 Membranous layer present C4 C4 C4 Activation of epidermis & hepatopancreas Do Regenerating limb buds begin rapid growtli Do Gastroliths begin to be formed Do Do I'^pidermis separates from old cuticle Di'a D„ D2 Do Do Di New setae begin formation as epidermal Di Di' Di Di'a Di' Di' Di' C4 invagination New setal invagination reaches maximum Di Di" Di Di" Di" Di'" D2 depth All morphological details of new setae now Di Di'" Di Di'" Di"' Do Di'" D2 D4 visible Reabsorption of membranous layer begins Di (late) Di Do Di Epicuticle secreted D2 Di Do' Do Di Di" D2 (ear- ly) Secretion of pre-exuvial endocuticle begins Di Di Do D2' Do Do D2 (late) Most of pre-exuvial endocuticle secreted D2 D2 D2 D2 D2" Do D2 Most of the old post-exuvial endocuticle U3 D3 L>3 D2 D3 reabsorbed +D3 Line of dehiscence open D4 D4 D4 D4 Da D4 1. Brachyura: Cancer, Mo/a. Drach, 1939. 2. Natantia: Leander. Drach, 1944. 3. Brachyura: Pachygrapsus. Hiatt, 1948. 4. Amphipoda: 22 genera. Charniaux-Legrand, 1951. 5. Amphipoda: Orcliestia. Charniaux-Cotton, 1957. 6. Macrura: Panulinis, Orconectes. Travis, 1960a, 1965. 7. l>: Leander, Processa. Scheer, 1960. 8. Review. Passano, 1960. 9. Isopoda: Armadillidium. Stevenson, 1961, 1964. 10. Brachyura: Gccaranw^. Skinner, 1962. 11. Anomura: Pelroltsthes. Kurup, 1964. lith and carapace lengths of each animal killed to make sections were measured. Twenty-two animals less than one year old (carapaces cm. long) of both sexes were made to aiitotomize the right posterior pereiopod during stage C^ or C4 (carapace rigid; no sign of premolt). The animals were separated into aquarium compartments, four animals to a compartment. Both the length of the regenerating limb bud and the molt stage of Drach were dete
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