. Cassell's natural history. Animals; Animal behavior. 248 NATURAL genus (Pompliolyx) thus gifted has no foot, whilst the genus PterodLna lias a disc on its foot, and is a very globose-looking form, and it carries its eggs for a time. In the last genus to be noticed of this family (Noteus) there are no eyes, and the foot is forked, and the body has spines in front and behind, being usually large, or from -^^th. to -^gth. of an inch. Amongst the Kotifera, with the trochal discs or rotary organs divided, are some in which the division is greater than in the two families just noticed. I
. Cassell's natural history. Animals; Animal behavior. 248 NATURAL genus (Pompliolyx) thus gifted has no foot, whilst the genus PterodLna lias a disc on its foot, and is a very globose-looking form, and it carries its eggs for a time. In the last genus to be noticed of this family (Noteus) there are no eyes, and the foot is forked, and the body has spines in front and behind, being usually large, or from -^^th. to -^gth. of an inch. Amongst the Kotifera, with the trochal discs or rotary organs divided, are some in which the division is greater than in the two families just noticed. In the family Hydatina and that of EuchlanidotiB tlie wheels are many-parted, and the first have no lorica, whilst in the latter the shell is very well developed, and has curious appendages, such as setaj in the genera Euchlanis and Stephanops, hooks in Colurus, horiLS in Salpinus. There are .spears or respiratory tubes in Euchlanis, and a helmet in Stephanops. In the genus Monostyla the foot is a sharp style, and in Mastigocerca the foot is as long as the body, or y^ of an inch, and the lorica is prismatic. The genus Squamella has four eyes. The species of this genus carry their eggs attached to the outside of the body. In many of the family the muscular fibres by which the shape of the body is changed are very visible. Tlie nutritive organs are very obvious, and the intestine is simple and conical, with or without the part which represents a stomach. The water system, with its tremulous flapping of minute cilia within the tubes, is visible, and in most the nervous .system is to be seen. There are no crushei-s or mastax in the r'enus Enteroplea ; it has no eyes, and it is thus a very simjJe Rotifer, and segmentation in any degree barely exists, the small foot being forked. In Hydatina, another genus, there are no eyes, two jaws, and they are divided to show numerous teeth. Ilydatiua seata was the Rotifer which Ehrenberg especially studied, and it is common and very transparent.
Size: 2183px × 1145px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjecta, booksubjectanimals
