. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 409 ROTIFERA. cles. The vascular system is composed of tremulous gill-like organs, and a respiratory spur or tube in some species. Noteus has no eyes, but a large cerebral ganglion ; the other genera have eyes. Analysis of the genera. Eyeless, with furcate foot. Noteus. One in"! Withont foot. Anurcca. neck. j| Foot furcated. Brachionus. Two frontal 1 St liform foot. pterodma. eyes. J J With the exception of Noteus, the genera of this family were known to the older ob- servers. Three species of Anuraea were de- scrib
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 409 ROTIFERA. cles. The vascular system is composed of tremulous gill-like organs, and a respiratory spur or tube in some species. Noteus has no eyes, but a large cerebral ganglion ; the other genera have eyes. Analysis of the genera. Eyeless, with furcate foot. Noteus. One in"! Withont foot. Anurcca. neck. j| Foot furcated. Brachionus. Two frontal 1 St liform foot. pterodma. eyes. J J With the exception of Noteus, the genera of this family were known to the older ob- servers. Three species of Anuraea were de- scribed by Miiller in 1776, and Joblot disco- vered the Brachionus pala (fig. 296.) in 1716. With eyes. I large quantities that they render the water turbid in which they exist. Doyere has constructed a family which he calls Tardigrades, and which are most properly included in the class of Rotifera. The ani- mals of this family have an elongated body, contractile like that of the Rotifer, with four pairs of short legs, each bearing two pairs of small claws. The alimentary canal is narrow, prolonged into a siphon at its anterior ex- tremity, with an internal maxillary apparatus, moveable, and consisting of a muscular bulb traversed by a straight canal, furnished with horny articulated pieces. Until this family was investigated by Doyere, it was supposed to consist of but one species, the Water-bear ( Wasser-bar) of Eichorn ; but under the name Fig. Brachionus pala. (After Ehrenlerg.') a, eye; b, jaws; c, ovary ; d, d, ova; e, contractile vesicle ; f, ova attached ; g, g, g, teeth of shell; h, h, intestinal glauds; i, constriction of alimentary canal; k, respiratory tube; /, I, transverse vessels. The Pterodina patina was described by Eic/iorn in 1775. The genus Brachiomis is, of all the Rotifers, the most remarkable for the density of its lorica. The thickness of this organ pre- vents their internal structure from being so plainly obseived as that of many other genera. The spe
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