. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CULTIVATION OF HERMISSENDA 433 350 r 300 -. 50 0 10 20 DAYS 30 40 FIGURE 1. Growth of veligers in terms of shell length. Vertical bars represent one standard deviation. Dots represent average shell length; triangles represent the size of the largest individual measured. by about 2-4 clays after maximum sbell length ( ± /xin, n =: 11) is attained. Veligers which were competent to metamorphose were recognized by the following criteria: presence of eyes, shell length of at least 300 p,m, enlargement of the foot and dev
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CULTIVATION OF HERMISSENDA 433 350 r 300 -. 50 0 10 20 DAYS 30 40 FIGURE 1. Growth of veligers in terms of shell length. Vertical bars represent one standard deviation. Dots represent average shell length; triangles represent the size of the largest individual measured. by about 2-4 clays after maximum sbell length ( ± /xin, n =: 11) is attained. Veligers which were competent to metamorphose were recognized by the following criteria: presence of eyes, shell length of at least 300 p,m, enlargement of the foot and development of the propodium, reduced swimming activity, the veliger remaining on or near the bottom, and the presence of a tooth at the base of the shell aperture. The average shell length of a sample of veligers did not accurately reflect the size of the largest individuals. Figure 1 illustrates shell growth in veligers from three replicate cultures. On day 34 post-hatching, competent veligers crawled immediately on the thecate hydroid, Obclia longissiina, and on an unidentified thecate hydroid from Cali- fornia. Competent veligers also crawled on the related species, Obclia ijcnicnlata, collected from Woods Hole, Massachusetts. The velum is lost during the first 12-24 hours after crawling begins. In the next 12-24 hours the larva slowly crawls out of its shell. During shell exit one pair of tentacle buds and two pairs of cerata buds grow out of the dorsal surface. The operculum is discarded at. 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 La
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
