. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 2. The zoeal stages of Pacliychclcs pubescens Holmes: A, D, first zoea; B, E, second zoea; C, setation of rostrum. Scale lines equal mm. survival to glaucothoe. In Figure 1, the per cent survival of the first and second zoeal stages is graphed for every 48 hour period. In both series there was a high mortality in the first zoeal stage, particularly during the first four days after hatching. A second high mortality occurred before the glaucothoe; in fact, a number of zoeae actually died in the process of molting to
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 2. The zoeal stages of Pacliychclcs pubescens Holmes: A, D, first zoea; B, E, second zoea; C, setation of rostrum. Scale lines equal mm. survival to glaucothoe. In Figure 1, the per cent survival of the first and second zoeal stages is graphed for every 48 hour period. In both series there was a high mortality in the first zoeal stage, particularly during the first four days after hatching. A second high mortality occurred before the glaucothoe; in fact, a number of zoeae actually died in the process of molting to this stage. These two periods seem to be the most critical in the larval development. It is probable that there are critical temperature, salinity or other physiological requirements at this time (Costlow, Bookhout and Monroe, I960). Measurements of the carapace, rostrum, posterior spines and ratio of the rostral to the posterior spines for the two zoeal stages of P. pubescens and P. rndis are presented in Table I. There is no significant difference in size between 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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