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.

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    2G Milleporida. MiUepora. Stylaster. Errina. Allopora. Polypora. StylastcridcB. Oryptohelia. Distichopora. Subclass II. DISCOPHORA. Piiaxeiiocarpa. Medusa:. Acraspeda. Hydrosome consisting of a single disk, from which one or more polypites are suspended. Free-swimming oceanic animals, whose reproduction is some- times by buds, which are formed either in pouch-like organs, dilatations of the stomach, or from the tentacles, or from the sides of the polypite. They are the Steganophthaimata or covered-eyed Medusae of Forbes; and to them Claus has restricted the old Cuvierian name of Acaleplnc. They are well known as sea-blubbers and sea-jellies. Most of them are luminous, but they do not appear to possess any special light-giving organs. Schmarda still (1877) includes in the Discophora the naked- eyed Medusae of Forbes, which are now known to be the sexual zooids or gonophores of the Gymnoblastea. There are three orders: but Calycozoa are sometimes ranked as a subclass; by Schmarda they are placed with the Anthozoa. Capable of attachment by the proximal end... Calycozoa. Incapable of attachment. Polypites numerous Riiizostomea. Polypite single Monostojiea. Polypites numerous, modified with the genitalia into a root- shaped mass. No central mouth nor marginal tentacles. At the extremity of the arms of the root-like mass are small openings, through which the food is conveyed along a central canal to the stomach. The embryo is a free oblong body [planula] which, soon attaching itself to some foreign substance, forms a mouth and stomach by invagination; tentacles then arise from the mouth, in Order I. RHIZOSTOMEA.