Medusae of the world . han the interradial clefts between them. Ifind that sections stained in Delafields haematoxylin show that the peronial canals andmarginal system is degenerate and mainly sealed over. Short lengths of the peronial canalsare sometimes found but they are merely disconnected lacunae and end blindly. Each sense-club has 3 concretions and there is an otoporpa over the exumbrella above it. The otoporpais short, club-shaped, and widest above. Each lappet bears 3 to 4 sensory-clubs. A conicalmass of gelatinous substance projects downward into the stomach cavity. The females out-n
Medusae of the world . han the interradial clefts between them. Ifind that sections stained in Delafields haematoxylin show that the peronial canals andmarginal system is degenerate and mainly sealed over. Short lengths of the peronial canalsare sometimes found but they are merely disconnected lacunae and end blindly. Each sense-club has 3 concretions and there is an otoporpa over the exumbrella above it. The otoporpais short, club-shaped, and widest above. Each lappet bears 3 to 4 sensory-clubs. A conicalmass of gelatinous substance projects downward into the stomach cavity. The females out-number the males. Metschnikoff (text-figure 316) gives a good figure of this medusa. NARCOMEDUS^E—CUNINA. 477 My studies at Naples lead me to believe that Cunina intrea Gegenbaur is only the youngof C. proboscidea. It is distinguished only by its smaller size, narrower stomach-pouches, andflatter, less conical stomach, but all of these change in larger medusae so as to approach theconditions typical of C. T73n. 3i6. 3H. Figs. 311 and 312 — Cunina globosa, after Eschscholtz. Figs. %W and 314.—Cunina campanulata, after Eschscholtz. Fig. ? lativtnirh, after Gegenbaur, in Zeit. fur wissen Zool., Bd. S. Fig. proboscidea. After Metschnikoff, in Arbeit. Zool. Inst. Wien. Metschnikoff, 1886, and Woltereck, 1905, find that amoeboid, neutral germ-cellswander out from both the male and female gonads of Cumna proboscidea These amoeboidcells then beain to divide in the entodermal pouches and substance of the sub-umbrella After this process of division these cells fuse with one another, so that one ot the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcnidari, bookyear1910
