. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 278 RYUZO YANAGIMACHI carrying juvenile females of Pcltogastcrclla on its abdomen was placed in the same vessel. Tbe number of juvenile females on the crab was 15, and they varied from to 3 mm. in length of the external sac-like portion. In every respect they were identical to those females which had recently emerged from the crab's abdomen. On the next morning, the three crabs were removed from the vessel and examined under a binocular dissecting microscope. Five cypris larvae were found attached to the mantle opening o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 278 RYUZO YANAGIMACHI carrying juvenile females of Pcltogastcrclla on its abdomen was placed in the same vessel. Tbe number of juvenile females on the crab was 15, and they varied from to 3 mm. in length of the external sac-like portion. In every respect they were identical to those females which had recently emerged from the crab's abdomen. On the next morning, the three crabs were removed from the vessel and examined under a binocular dissecting microscope. Five cypris larvae were found attached to the mantle opening of four juvenile females of Peltogasterclla. Two cypris larvae were about to inject their internal cellular contents into the mantle cavity of the juveniles (Fig. 6). Three cypris larvae, on the other hand, had already injected their cellular contents into the juveniles. No cypris was detected on the surface of the crab's body, although careful and repeated examina- tions were carried out. (Experiment 2). On October 1, small nauplii were discharged from five fe- males on a host-crab. They were placed in a vessel of sea water and reared. On October 5, they metamorphosed into small cypris larvae. On the evening of. FIGURE 6. A large cypris fixed at the mantle opening of a juvenile female. Magnification: < 80. FIGURE 7. A small cypris fixed at the base of a seta on the carapace of a host-crab. Magnification: X 80. October 7, two young crabs (Pagurus lanuginosus of 3 to 4 mm. carapace length) were put into the vessel in which the small cypris larvae were swimming. At the same time, a large crab (Pagurus lanuginosus of 13 mm. carapace length), infested by 13 juvenile females of Pcltogastcrclla, was put into the vessel. The next morn- ing, the three crabs were removed from the vessel. On careful examination, several cypris larvae were found attached to the body of the young crabs. These cypris larvae were invariably affixed to the base of the setae on the crab's body. The setae on
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
