. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 56 TOLYPIFERA. thickened lining membrane of the cell. This cavity once formed, the development of the different organs proceeds rapidly. First, in the middle of the cavity there appears a longi- tudinal fold resembling two lips {fig. 62. 2), which, as they approach each other, divide the cavity of the body into an anterior and a posterior compartment. The two lips, which have a valvular appearance, become indented very regularly along their margins, and are soon recognisable as the rudiments of the tentacular circle (yzg
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 56 TOLYPIFERA. thickened lining membrane of the cell. This cavity once formed, the development of the different organs proceeds rapidly. First, in the middle of the cavity there appears a longi- tudinal fold resembling two lips {fig. 62. 2), which, as they approach each other, divide the cavity of the body into an anterior and a posterior compartment. The two lips, which have a valvular appearance, become indented very regularly along their margins, and are soon recognisable as the rudiments of the tentacular circle (yzg. 62 3). At this epoch, it must be remarked, the polype presents two cavities distinct from each other. There is a space between the walls of the body and the parietes of the Fin. Lagttncula repens, magnified 400 diameters. A. The animal completely its cell; B, another individual completely expanded ; C, the outlines of another individual retracted. The same letters apply to each of the figures. The various viscera are situated in different planes, but are here represented all in the same. a, the tentacles, protruded and expanded in B.; the arrow indicates the set of the currents caused by the vibration of the cilia; b, buccal cavity; c, valve separating this cavity from the oesophagus; d, oesophagus; f, pyloric valve; g, cilia, producing the rotation of the food in the stomach; /;, thickness of the parietes of the stomach; I, intestine; Jt, ex- crement contained in its interior; /, anus ; m, testicle ; w, ovary; o, ovum escaped from the ovary; p, aper- tures through which the eggs are expelled, with an ovum in the act of escaping, q, spermatozoa, freed from the testicle, and floating in the fluid that sur- rounds the digestive canal; r, s> t~, «, e> muscles, re- tractors of the parts to which they are attached; «•, principal retractor muscle; x, transverse folds of the collar; y, bands, perhaps muscular, of the collar; «., nervous cesophageal ga
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