Zoological classification : a handy book of reference with tables of the subkingdoms, classes, orders, etc., of the animal kingdom, their characters and lists of the families and principal genera / [Francis Polkinghorne Pascoe].

  • Francis Polkinghorne Pascoe
Date:
1880
Catalogue details

Licence: Public Domain Mark

Credit: Zoological classification : a handy book of reference with tables of the subkingdoms, classes, orders, etc., of the animal kingdom, their characters and lists of the families and principal genera / [Francis Polkinghorne Pascoe]. Source: Wellcome Collection.

    41/347
    ■which stage it is known as the “ hydra tuba” (Scyphistoma), which by budding gives rise to colonies of “ Hydriform polypi;” some of these assuming the form of a pile of cups placed one within the other, is now called a “ strobilathen the cups separating, each becomes a free-swimming disk [ephyra], by degrees acquiring the adult form. 2i'hizostomides. Cassiopeiidts. Polycloniid<b. Rhizostoma. Cassiopeia. Polyclonia. Leptobrachiidce. Leptobracliia, Cepheidce. Cephea. CrambessideB. Crambessa. *Hexarhizites. Order II. MONOSTOMEA. Pelagiada. Polypite single. A central mouth. The disk with marginal tentacles, or if without them with tentacles under the disk. The reproductive elements are developed in the disk, or by fission from a fixed trophosome, and, in their detached condition, grow with great rapidity, ultimately attaining a weight of many hundreds of pounds. Cyanma arotina has been found with a disk seven feet in diameter and wit!) tentacles fifty feet long, the fixed trophosome from which it proceeded being of very small size. CyaneidcB. Cyanea. Aureliidig. Aurelia = Medusa. Pclagiidce. Pelagia. Chrysaora. Nausithoe. Order III. CALYCOZOA. PODACTINARIA. LuCERNARIIDA. Polypite single, in the centre of a cup-shaped umbrella, its proximal end fixed. Generative elements discharging themselves into the body-cavity. The umbrella is eight- or nine-lobed in Luccrnaria, each lobe bearing a tuft of tentacles; in Carduclla they form one con- tinuous series. “ The whole organism is semitransparent, variously coloured, and of a gelatinous consistence.”