. Text book of zoology. Zoology. Fig. 241. The shells of two examples of a tropical land Snail (Bulimus perversus). A left-handed spiral. B right-handed spiral.—After v. Martens. Fig. 242. Shell of a Snail (Paludina) in which a large part of the wall towards the observer is broken away, n umbilicus, s columella.— 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 Boas, J. E. V. (Johan Erik Vesti), 1855-1935; Boas, J. E.
. Text book of zoology. Zoology. Fig. 241. The shells of two examples of a tropical land Snail (Bulimus perversus). A left-handed spiral. B right-handed spiral.—After v. Martens. Fig. 242. Shell of a Snail (Paludina) in which a large part of the wall towards the observer is broken away, n umbilicus, s columella.— 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 Boas, J. E. V. (Johan Erik Vesti), 1855-1935; Boas, J. E. V. (Johan Erik Vesti), 1855-1935. Lehrbuch der Zoologie. London, Sampson Low, Marston
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
