. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 346 RUDOLF S. SCHELTEMA ment of the foot and from the behavior of the larvae, namely, frequent creeping on, and inspection of, the bottom . The length of the first period is determined by those conditions which control larval length of the second period varies greatly, at least two-fold in N. obsolctus, and depends upon the encounter by the larva of a sediment suitable for post-larval life (Scheltema, 1961 ). Under favorable conditions metamorphosis may occur very near the beginning of the second period. The total
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 346 RUDOLF S. SCHELTEMA ment of the foot and from the behavior of the larvae, namely, frequent creeping on, and inspection of, the bottom . The length of the first period is determined by those conditions which control larval length of the second period varies greatly, at least two-fold in N. obsolctus, and depends upon the encounter by the larva of a sediment suitable for post-larval life (Scheltema, 1961 ). Under favorable conditions metamorphosis may occur very near the beginning of the second period. The total length of 700 r. >100% MORTALITY O LARVAE GROWN AT A LARVAE GROWN AT • LARVAE GROWN AT • LARVAE GROWN AT 6 9 12 TIME IN DAYS 15 18 FIGURE 4. Increase in length of Nassarius obsolctus veliger larvae from the time of emergence from egg capsules to the completion of their development to the creeping-swimming stage. This is the first pelagic phase, during which growth occurs at a rapid and nearly constant rate. Each curve shows the result at a different salinity as indicated by the 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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