Journal of morphology . towards the head,and the aperture opens toward the tail. 226 KINGSLEY. [Vol. VIII. distance and then an inpushing takes place just behind theappendage, the opening of the invagination, according to Kish-inouye being away from the median Hne. This sac, the futurepuhnonary cavity, continues to increase in size, while the ap-pendage proper soon becomes obsolete. In this way the pul-monary sac, with its external opening or stigma, is the pulmonary sac is formed there begins on its anterior wall, on the continuation of the posterior wall of the appendage
Journal of morphology . towards the head,and the aperture opens toward the tail. 226 KINGSLEY. [Vol. VIII. distance and then an inpushing takes place just behind theappendage, the opening of the invagination, according to Kish-inouye being away from the median Hne. This sac, the futurepuhnonary cavity, continues to increase in size, while the ap-pendage proper soon becomes obsolete. In this way the pul-monary sac, with its external opening or stigma, is the pulmonary sac is formed there begins on its anterior wall, on the continuation of the posterior wall of the appendage, — a series of foldings of the ectoderm, the lung-leaves. As the animal increases in size, new lung-leaves areadded at the inner or proximal end. In short, as the adjacentdiagrams show, the homologies between the two types of organsare perfect. In / we have a condition which will apply equally well tothe young of either Limulus or Scorpio. At the right sidethe appendage is just budded out, and on the left the sinking.
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