. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 406 ROTIFERA. two strap-shaped sexual glands and contrac- tionary system is indicated ^by the presence of tile vesicles. Traces of a vascular system are eyes, which are visible in ten genera and thirty- tile vesicles. seen only in a few species. The sensa- three species. Analysis of the genera. Eyes ab-j Foot furcate, sent. j Lepadella. £,,,.,. c , f Depressed shield. Styliform foot. i Monostyla. I Prismatic shield. Mastigocerca. One eye in neck. Shield gaping be-| neath. } Eiichlanis. Furcated foot. „,. , [Shield horned
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 406 ROTIFERA. two strap-shaped sexual glands and contrac- tionary system is indicated ^by the presence of tile vesicles. Traces of a vascular system are eyes, which are visible in ten genera and thirty- tile vesicles. seen only in a few species. The sensa- three species. Analysis of the genera. Eyes ab-j Foot furcate, sent. j Lepadella. £,,,.,. c , f Depressed shield. Styliform foot. i Monostyla. I Prismatic shield. Mastigocerca. One eye in neck. Shield gaping be-| neath. } Eiichlanis. Furcated foot. „,. , [Shield horned. Shield closed be-J Salpina. Eyes pre- neath. > Shield without I horns. Dinocharis. sent. Styliform foot. Alonura, 'Shield, somewhat! Two eyes compressed or t Colurus. frontal. Furcated foot. prismatic. J Shield depressed f Hooded, or cylindrical. ^Not hooded. Stephanops. Metopidia. Four eyes. Furcated foot. Squametta. In this as in the preceding family, there can be little doubt that the artificial character, the number and position of the so-called eyes, on which the genera are founded, separates species which are united by much more im- portant characters. Thus Dujardin remarks, that the genera Lepade/la, Metopidia, Ste- phanops, and Squamella are separated only by characters which vary according to the nutrition of the animal and the time of the year. The same remark will apply to many of the genera of the preceding family Hyda- tinaea. The species of this family are found in both salt and fresh waters, and have a wide distribution over the surface of the earth. The genus Lepadella is developed sometimes in stagnant water in such quan- tities as to give it a milky appearance. Family 7. — PHILODIN^A. Character. Naked Rotifers with two rotatory organs. The body of these animals is mostly of a ten- inform, cylindrical, or spindle-shape, with false articulations, by which, through its muscles, the animal is enabled to withdraw the parts of its body one within another,
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