Elementary text-book of zoology, general part and special part: protozoa to insecta . elementarytextbo00clau Year: 1892 CTENOPnOKA, 2fi3 bilaterally symmetrical, although each half possesses this property. The body is divided by these two perpendicular pianos into four similar quadrants. Locomotion is principally effected by the regular vibration of the hyaline swimming plates, which are dis-posed over the surface of the body in eight meridional rows, in such a way that each quadrant possesses two rows of plates, a transverse and a sagittal (fig. 202). Locomotion is also assisted by the contr
Elementary text-book of zoology, general part and special part: protozoa to insecta . elementarytextbo00clau Year: 1892 CTENOPnOKA, 2fi3 bilaterally symmetrical, although each half possesses this property. The body is divided by these two perpendicular pianos into four similar quadrants. Locomotion is principally effected by the regular vibration of the hyaline swimming plates, which are dis-posed over the surface of the body in eight meridional rows, in such a way that each quadrant possesses two rows of plates, a transverse and a sagittal (fig. 202). Locomotion is also assisted by the contractility of the muscle fibres of the gelatinous tissue; this contractility in the band-shaped Cestidce causes an undulating motion of the whole body. The mouth, which is sometimes surrounded by umbrella-shaped lobed processes of the gelatinous tissue, leads into a wide [Beroe) or narrow oesophageal tube, which in the latter case soon becomes flattened and broad. The oesophageal tube is furnished with two hepatic bands, and com- i
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