. An elementary course in practical zoölogy [microform]. Zoology; Zoologie. THK SNAIL. 67 4 -. Thr "liorns" are the feelers, ,.r tentacles; t-lu'iii ; what \v(uil(l .seem to be their use/ 3. The (hirlv spots at the bases of the tentaeles are the eyes; are they borne on a stalk in any cununon snails ? Wateh the snail crawling on the glass; near the front of the loot the mouth may be seen; observe its open- ing and shutting as the snail gathers food from the surfaee of the glass. Do snails elean the jrlass or foul it ? ^ Most snails have a ribbon-like tongue, fastened at eaeh
. An elementary course in practical zoölogy [microform]. Zoology; Zoologie. THK SNAIL. 67 4 -. Thr "liorns" are the feelers, ,.r tentacles; t-lu'iii ; what \v(uil(l .seem to be their use/ 3. The (hirlv spots at the bases of the tentaeles are the eyes; are they borne on a stalk in any cununon snails ? Wateh the snail crawling on the glass; near the front of the loot the mouth may be seen; observe its open- ing and shutting as the snail gathers food from the surfaee of the glass. Do snails elean the jrlass or foul it ? ^ Most snails have a ribbon-like tongue, fastened at eaeh end, and covered with teeth; as this tongue is applied to an object, and drawn rapidly back and forth, it acts like a rasp ; in this way some marine snails bore holes through the shells of other mollusks and feed on them. 5. Many snails have gills; others breathe by a simple lung. Watch the snails, to see if any of them come to the surface to get air; how is this done ? THE SNAIL-SHELL. 1. The pointed end is the apex. ± The opening at the large end is the aperture. â I The outer edge of t'le aperture is the lip. -i. The lines parallel to the lip are the lines of growth. .). The si)iral groove on the outside is the suture. ' The turns of the shell between the groove are the whorls. The whf)rls, taken together, make the spire. The lid closing the aperture is the operculum; is thia s. 1 i ese! .f .,11 +Kâ .-I OilU/HO J ou imu ]â }. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Colton, Buel P. (Buel Preston), 1852-1906. Halifax, N. S. : T. C. Allen; Boston : D. C. Heath
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
