Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget .. . Like the animals of the sponge tribe. Polypiare for the most part attached to some inorganicshell or base, which may be either of a horny orcalcareous nature. The form of this shell admitsof almost infinite variety. In some it constitutesthe external surface of the animal, and enclosesthe flesh in a general sheath, leaving onlyopenings at the extremities of the tubes for theexpansion of each set of tentacula surroundingthe respective mouths. Sometimes these tubesare placed parallel to each
Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget .. . Like the animals of the sponge tribe. Polypiare for the most part attached to some inorganicshell or base, which may be either of a horny orcalcareous nature. The form of this shell admitsof almost infinite variety. In some it constitutesthe external surface of the animal, and enclosesthe flesh in a general sheath, leaving onlyopenings at the extremities of the tubes for theexpansion of each set of tentacula surroundingthe respective mouths. Sometimes these tubesare placed parallel to each other, like the pipesof an organ, with transverse partitions at regularintervals: such is the structure of the Ttihipora * See pa-re 90. POLYPI. 165 miisica, as shown in Fig. 61. In Fig. 62, aportion of the tubes is seenhighly magnified, and laidopen, to show the polypes intheir interior. At other timesdie tubes are joined togetherendwise, like the branches ofa tree, leaving lateral aper-tures for the protrusion of thetentacula of each separate polype: this is the case in the Sertularia. (Fig. 60.).
Size: 1231px × 2030px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury18, booksubjectnaturaltheology, booksubjectphysiology
