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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    lobes [actinomeres] ; each band lias a number of successive ridges or plates, to each of which a row of cilia is attached. The lateral actinomeres contain each a sac, which gives rise to the tentacles when present. In this class occurs a well-marked sense-organ [ctenocyst], ovate or spherical, occupying a central position, which “ would seem to be the localized recipient of those obscure general impressions to which its lowly-organized possessor is capable of responding.” [ Greene.] Reproduction is by ova, which are expelled by the mouth, and the young are gradually developed, few having a larval stage. The homologies between this class and the larval ecliinoderms have led to the suggestion of their being united. The species vary considerably in size and shape. They are all oceanic and of a very delicate texture, leaving only a mere film when dried in the sun; they are said, however, to be very voracious, and to have a powerful digestion. With two oral lobes Lobatas. Without oral lobes. Body ribbon-shaped TyENiatyE. Body oval or round. With two filiform tentacles Saccat.e. Without tentacles Eurystomata. Order I. LOBATiE. Body with two oral lobes. Tentacles various, turned towards the mouth or wanting. The lobes project from the antero-posterior regions of the body, sometimes so as to conceal the mouth. The two lateral actino- meres generally terminate in a slender appendage or tentacle. Eurhampha-idse have no tentacles. According to Agassiz, <S'icyosoma is the larval form of a Cesium. Eurhanvphceida. Mncmiidw. Calymmidce. Eurhamphaeit. Mnomia. Calymma. Lesueuria. Bolinidm. Chiajea. Ocyr aides. Bolina. Ocyroe. Sicyosoma.