. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTERMOLT CYCLE OF B. AMPHITRITE 313. FIGURE 2. Setae of Balanus uuiphitritc in Stage C showing the setal matrix ( SM ) in the expanded state; ramus mounted in seawater; marker -: 10 /*. FIGURE 3. Setae of Balanns amphitrite in Stage D0 showing the setal matrix ( SM ) in the contracted state; ramus mounted in seawater; marker = 10 /z. pods in general (Hackman. 1971 ). These terms will be used throughout this paper. As shown in Figure 1 a new procuticle is laid down in proecdysis before the animal has passed through 75 per ce
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTERMOLT CYCLE OF B. AMPHITRITE 313. FIGURE 2. Setae of Balanus uuiphitritc in Stage C showing the setal matrix ( SM ) in the expanded state; ramus mounted in seawater; marker -: 10 /*. FIGURE 3. Setae of Balanns amphitrite in Stage D0 showing the setal matrix ( SM ) in the contracted state; ramus mounted in seawater; marker = 10 /z. pods in general (Hackman. 1971 ). These terms will be used throughout this paper. As shown in Figure 1 a new procuticle is laid down in proecdysis before the animal has passed through 75 per cent of the intermolt cycle. The first presence of the new procuticle is difficult to distinguish from the granular epidermis. We have defined the new procuticle to be present when the segmental hinge on the posterior side of the ramus is present and when the layer making up the hinge is clear and nongranular in appearance (see Fig. 7). The new procuticle and the same procuticle immediately after ecdysis has a light green appearance and can- not be resolved into its component layers. The thickness of this procuticle. how- ever, is greater than the thickness of the exocuticle (Fig. 1 ). We interpret this as meaning that the procuticle in this state is composed of the exocuticle and a small portion of the endocuticle but that they are not visibly differentiated, , the exocuticle is not sclerotized. Within four hours after ecdysis the procuticle can be resolved into an exo- and endocuticle. The exocuticle then remains constant in thickness throughout the intermolt cycle while the procuticle increases in thickness in the first portion of the intermolt cycle and decreases in the last portion (Fig. 1). The changes in thickness of the procuticle thus reflect the changes which are occurring in the endo-. 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
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