. Elementary lessons in zoölogy : a guide in studying animal life and structure in field and laboratory . „ y<--|- -^'S ?;,,. •^ 5. An oblique groove (^peristome} extending from the anterior end halfway along one side of the animal, and so twisted that its edges form an elongated 8-shaped figure when viewed from the side (see cut). 6. A fringe of cilia, longer and stronger than those of the body, all around the edge of this groove. These set up currents in the water, which may be seen, if there be any loose sediment in the water, set- ting toward the posterior eud of this groove. 7. A funne
. Elementary lessons in zoölogy : a guide in studying animal life and structure in field and laboratory . „ y<--|- -^'S ?;,,. •^ 5. An oblique groove (^peristome} extending from the anterior end halfway along one side of the animal, and so twisted that its edges form an elongated 8-shaped figure when viewed from the side (see cut). 6. A fringe of cilia, longer and stronger than those of the body, all around the edge of this groove. These set up currents in the water, which may be seen, if there be any loose sediment in the water, set- ting toward the posterior eud of this groove. 7. A funnel-shaped chamber (^vestibule, or mouthy in the poste- rior end of this groove. Toward this the currents in the water tend, and into it they drive the particles they sweep along. Near to this chamber, and in the central portion of the body, is an elongated, often spindle-shaped nucleus, often hardly visible with- out staining. In one or two places in the body there is a clear, round spot of con- siderable size (usually one near each end), which regularly ap- pears and quickly disappears sev- eral times a minute. Each of these is a contractile vesicle. If one of these be watched very closely, it will be seen to have minute, radi- ating tabes appearing around it when it contracts. The remaining objects seen in the endosarc are food
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
