. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. BREEIUXG HABIT ANI) OF K ACOPHoüFS. \2Ì A. B are thrust back. It may appear strange that these treading and kneading mo- tions do not injure the eggs, but whan we consider that they are covered over with highly elastic and tenacious jelly full of air bubbles acting as a sort of cushion, the safety of the eggs is not so mysterious as may appear at first sight* Fig. 2. The hind limbs of the male on the back of the female are bent in a vertical plane. The knee which is strongly AB—a thin membrane seen in the sagittal sectio
. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. BREEIUXG HABIT ANI) OF K ACOPHoüFS. \2Ì A. B are thrust back. It may appear strange that these treading and kneading mo- tions do not injure the eggs, but whan we consider that they are covered over with highly elastic and tenacious jelly full of air bubbles acting as a sort of cushion, the safety of the eggs is not so mysterious as may appear at first sight* Fig. 2. The hind limbs of the male on the back of the female are bent in a vertical plane. The knee which is strongly AB—a thin membrane seen in the sagittal section. A C L> E—a vesicle produced by the folding of the membrane AB. flexed is inserted between the anterior margin of the femur and the sides of the belly of the female. The crus and pes are moved as a whole dorso-ventrally, thus stroking the pelvic portion of the female. This motion on the part of the male, it seems to me, is probably done in (jnier to assist, by stimulation, the egg-deposition of the female. In some instances, however, another sort of motion was often gone through by the hind limbs of the male, in this way, viz. the hind limbs are withdrawn from the above mentioned position and soon thrown back, the crus and pes rubbing the dorsal face of the loin and cloaca of the female. Such a motion of the male hind limbs seems to me to be done to clear away the jell}' particles adhering to the region in cpuestion of the female, which possibly interfere with the safe passage of the sperm-fluid. The eggs in the frothy mass differ more or less in size according to that of the mother animal, but in general they measure about 1 mm. in diameter, and are at first free from any pigment, which appears onhy later at the tadpole stage. The yolk pole is yellow, while the animal pole is merely pale and somewhat translucent. The very thin structureless yolk-membrane is closely applied to the egg, around which the jolly- Eggs and Please note that these images are extra
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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1890, bookyear1897
