. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Development of Rfedvsce. ( From Sars, Steenstrup, and Dalyell.) a, b, ciliated free moving embryo from the ovum ; c, embryo attached bjT its pedicle; d, its tentaciila beginning to be formed; e, with four,/; with eight tentaciila ; g, the fully developed polype, producing other polypes by gemmation ; h, i, k,~ transverse di- vision and development of Medusae from the polype stock or strobila ; /, a pile consisting of four Me- dusoids just about to separate; m, «, and lower lateral view of Medusae separated from the polyp
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Development of Rfedvsce. ( From Sars, Steenstrup, and Dalyell.) a, b, ciliated free moving embryo from the ovum ; c, embryo attached bjT its pedicle; d, its tentaciila beginning to be formed; e, with four,/; with eight tentaciila ; g, the fully developed polype, producing other polypes by gemmation ; h, i, k,~ transverse di- vision and development of Medusae from the polype stock or strobila ; /, a pile consisting of four Me- dusoids just about to separate; m, «, and lower lateral view of Medusae separated from the polype stock; o, more advanced, natural size: p, r, (from Dali/ell), p, a pile of medusa discs separating, and new tentacula formed on the polype at the base; r, the same, with more of the discs separated; the strobila returning to its polype state arid budding at the side. be capable of multiplying itself, or producing other similar attached Polypes by gemmation from its side or base, or from a running stolon below it. The subsequent change of each of these polypoids is remarkable. It has been described by Sars and Dalyell as follows : — The body undergoing some elongation be- comes partially divided by transverse grooves, into a range or column of imperfect Medusae, attached still to each other by their adjacent surfaces, but presenting at their borders, in various degrees of advancement, the division into rays or lobes which belong to the Me- dusa ; the upper or terminal one having deve- loped upon it a set of radiated processes dis- tinct from the tentacles of the Polype and much longer than those of the rest. These young Medusas are successively separated from the stock by the deepening of the transverse clefts between them. They then move about as independent animals, and proceed in their farther growth and development to sexual and other completeness. These bodies, therefore, are subject to two kinds of multiplication, which are very different: by simple gemma- tion a num
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