. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 412 ROTIFERA. fig. ). To the semicircular pieces are attached some of the longitudinal muscles, which, by their action, cause the teeth to work upon the central plate. The general structure of the jaws is, in all instances, the same, but the number of processes, called teeth, varies considerably. (Sometimes no such processes are discoverable, as mCyphonautes ; in others, there is but one tooth on each side, as in spe- cies of Synchcsta, Diglena, Lepadella, and Mo- nostyla. Some have two on each side, as Mo- nocerca,
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 412 ROTIFERA. fig. ). To the semicircular pieces are attached some of the longitudinal muscles, which, by their action, cause the teeth to work upon the central plate. The general structure of the jaws is, in all instances, the same, but the number of processes, called teeth, varies considerably. (Sometimes no such processes are discoverable, as mCyphonautes ; in others, there is but one tooth on each side, as in spe- cies of Synchcsta, Diglena, Lepadella, and Mo- nostyla. Some have two on each side, as Mo- nocerca, Mastigocerca, and Rotifer (fig. 301.). Others, again, present three, four, or several teeth on each side, as in Brachionus brevisti- mus (J%.300.), Triarthra longiseta (Jig. 297.), Brachionus pala (fig. 296.). Such are the cha- racters afforded by the teeth in this family, that Ehrenberg gives an arrangement of the Fig. Rotatory organs of Rotifer vulgaris enlarged. (After Ehrenberg.) a, hornlike process (respiratory tube); b, b, muscles of tiie jaws; c, c, intestinal glands. genera into orders, according to the absence or presence and number of the teeth, as follows: — 1. AGOMPHIA. Rotifers without teeth. Examples : Chatonotus, Enteroplea. 2. MONOGOMPHIA. With a single tooth. Examples: Pleurotrocha, Furcularia. 3. POLYGOMPHIA. With many teeth. Ex- amples : Hydatina, Stephanoceros, Brachionus. 4. ZYGOGOMPHIA. With double teeth. Examples: Rotifer, Philodinee. 5. LOCHOGOMPHIA. With teeth in rows. Examples : Ptygura, Megalotrocha. The teeth seem to form the most dense part of the body of the Rotifera, and, after the crushing of the animalcule, may be ob- tained for separate examination under the microscope. The whole masticatory apparatus is at- tached to the upper part of the alimentary canal, the oesophageal head, where it may be observed, being constantly in motion. This movement, which goes on whether the animal is partaking food or not, was mistaken by the earlier ob
Size: 1584px × 1577px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
