A Manual of Zoology for the Use of Students volume 1
A Manual of Zoology for the Use of Students volume 1
Nicholson Henry Alleyne
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In the further process of development, 'an involution of the integument takes place upon one side of the dorsal region of the body, so as to give rise to a csecal tube, which gradually elongates inwards, and eventually reaches a mass of formative matter, or blastema, aggregated upon one side of the stomach. Within this, the end of the tube becomes converted into a circular vessel, from which trunks pass off, radially, through the enlarging blastema. The latter, gradually expanding, gives rise i...n the Echinidea, the Asteridea, the OpJmiridea, and the Crinoidea to the body- wall of the adult ; the larval body and skeleton (when the latter exists), with more or less of the primitive intestine, being either cast off as a whole, or dis- appearing, or becoming incorporated with the secondary development, while a new mouth is developed in the centre of the ring formed by the circular vessel. The vessels which radiate from the latter give off diver tic ula to communicate with the cavities of numerous processes of the body the so- called feet which are the chief locomotive organs of the adult.
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