. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 110 ANIMAL KINGDOM. around the anterior part of the body. They are termed rotifera from the appearance of revolving wheels produced by the rapid move- ment of the cilia disposed around the One of these minute wheel-animalcules, the hydatina senta, is represented highly magnified in Jig. 35, where the mouth (a) is surrounded with long vibratile cilia (b 6). The oesophagus (c) leads to a capacious stomach (</), which becomes a narrow intestine below, opening into the cloaca (e), where the genital organs (i,i,g,g
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 110 ANIMAL KINGDOM. around the anterior part of the body. They are termed rotifera from the appearance of revolving wheels produced by the rapid move- ment of the cilia disposed around the One of these minute wheel-animalcules, the hydatina senta, is represented highly magnified in Jig. 35, where the mouth (a) is surrounded with long vibratile cilia (b 6). The oesophagus (c) leads to a capacious stomach (</), which becomes a narrow intestine below, opening into the cloaca (e), where the genital organs (i,i,g,g,h,) also terminate. Several ganglia surround the oesophagus, and a dorsal vessel (o o) is seen extending along the middle of the back and sending out regular transverse branches. All the rotifera are free, most are naked, many are sheathed or loricated, they exhibit no branchial or pulmonary organs, they are remarkable for their fertility and their tenacity of life. (See ROTIFERA.) 8. Cirrhopoda, aquatic, articulated, diplo- neurose animals, with articulated cirrhi, and branchiae for respiration, body covered with a fleshy mantle, and fixed in a multivalve shell. These animals are all marine, the branchiae are fixed to the bases of the articu- lated cirrhi, the mouth is provided with man- dibles and maxillae, there is a pulsating dorsal vessel, and a double longitudinal knotted sub- abdominal nervous chord. The cirrhopoda have been commonly placed among the molluscous classes from the form of their exterior coverings. (See CIRRHOPODA.) 9. Annelida, with a long cylindrical body generally divided into transverse segments, and covered with a soft skin; the head commonly provided with antennae and numerous simple eyes, and the mouth with maxillae ; the organs of motion in the form of simple setae or cirrhi extending from the sides of the body in a sin- gle or double row. The vascular system of the annelida consists of arteries and veins, without a distinct auricle or ventricle, a
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