. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE PROSOPYQIA. 263 phic form is known as the Vihracula, and consists of a slender filament movably articulated to a rounded structure corre- spondiug to the head of the Avicularia ; the filameutr wave continually to and fro and are probably tactile in fuiiction. In many forms, too, in the neighborhood of the mouths of the ordinary individuals sac-like pouches occur, in which the ova undergo their development. These structures, known as ovicelh (Eig. 116, oc), or ooeci
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE PROSOPYQIA. 263 phic form is known as the Vihracula, and consists of a slender filament movably articulated to a rounded structure corre- spondiug to the head of the Avicularia ; the filameutr wave continually to and fro and are probably tactile in fuiiction. In many forms, too, in the neighborhood of the mouths of the ordinary individuals sac-like pouches occur, in which the ova undergo their development. These structures, known as ovicelh (Eig. 116, oc), or ooecia, have also been considered modi- lied individuals, but seem rather to be organs of the ordinary individuals, arising as a pouching of their walls. Finally, not iufrequently certain individuals relinquish their nutritive. Fio. 117.—^, Lauva op PedkelUna fafter Hatschek) ; B, CyphonauUs (after Pkouho). ad = adhesive orgau. « = stomiicli. cal = calotte. sh = sliell. cor = coroMu. pyr = pyrifonn organ.' function and serve as root-like anchors or stem-like supports for the entire colony. As regards the internal structure of the Gymnolwmata it IS unnecessary to add anything to what has already been stated in describing the general characteristics of the order Ectoprocta. Development of the PoJyzoa.—The larva of PcdkrUimt (Fig. 117, A ), which may be taken as a type of the Endoprncta, is a somewhat donie-shapiul organism, the summit of the dome IxMug occupied by an apical thickening {cat) bearing a tuft of ciliji, while at the marmn tlif»ro iu n uf,.i •iliary band, ti iO I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McMurrich, J. Playfair (James Playfair), 1859-1939. New York : H. Holt
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