. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 RYUZO YANAGIMACHI A crab carrying adult females of Peltogasterclla on its abdomen was placed in a vessel of sea water. All the females except one were mechanically detached. Then, the successive batches of nauplius larvae expelled from this remaining female were examined. Five experiments of this type were conducted. It was found that one female always produces either large or small larvae. (c) Peltogasterclla gracilis, in common with other species of its genus, occurs gregariously on one host. Do females of Peltogasterc
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 RYUZO YANAGIMACHI A crab carrying adult females of Peltogasterclla on its abdomen was placed in a vessel of sea water. All the females except one were mechanically detached. Then, the successive batches of nauplius larvae expelled from this remaining female were examined. Five experiments of this type were conducted. It was found that one female always produces either large or small larvae. (c) Peltogasterclla gracilis, in common with other species of its genus, occurs gregariously on one host. Do females of Peltogasterclla on a single host emit both large and small larvae? Table I summarizes the measurements of the larvae and of the eggs derived from the females on six different host-crabs. It may be seen from this table that the females on one host produce larvae of one type—either large or small. The author examined the females on 25 different host-crabs. Females on 11 crabs (2 5 and 9 $') produced exclusively large larvae and those on 12 other crabs (7 $ and 5 J1) produced small larvae. The females on the remaining two crabs, on the other hand, produced both large and small larvae. The data on these two exceptional females will lie presented 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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