. Outlines of zoology. by a membrane called the velum,and is fringed by twelve velartentacles, which must not beconfused with the external the larva the hood is absent,and the mouth is flush with thesurface. The mouth opens into thepharynx, which, like it, is richlyciliated. The pharynx, like thatof Tunicates, and indeed ofFishes also, is modified for re-spiration (Fig. 249, /%.). Itswalls are perforated by numerousgill-slits on each side, and be-tween these lie supporting barsalternately split and unsplit attheir lower ends. Along the mid-dorsal and mid-ventral lines there are groove
. Outlines of zoology. by a membrane called the velum,and is fringed by twelve velartentacles, which must not beconfused with the external the larva the hood is absent,and the mouth is flush with thesurface. The mouth opens into thepharynx, which, like it, is richlyciliated. The pharynx, like thatof Tunicates, and indeed ofFishes also, is modified for re-spiration (Fig. 249, /%.). Itswalls are perforated by numerousgill-slits on each side, and be-tween these lie supporting barsalternately split and unsplit attheir lower ends. Along the mid-dorsal and mid-ventral lines there are grooves,respectively called hyper- andhypo- branchial. The latter iscomparable to the endostyle ofAscidians, by which name it isoften called. As in Ascidians,
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
