. An introduction to zoology, with directions for practical work (invertebrates). lie INTRODUCTION TO ZOOLOGY chap. Shell f to 1 inch in diameter, rounded on both sides. Whorls 5 or 6. Dark reddish brown in colour, very common in some localities, and always to be had readily from any dealer in aquatic specimens. Eggs 20 to 45 in a flat, oval capsule attached to a leaf. Easp with 67 teeth in each row, and 200 rows. Planorbis complanatus (= umbilicatus).âShell | inch dia- meter : 5 or 6 whorls. One side of the shell is flat or. Fig. 66.âThe Common Trumpet Snail {PlanorMs corneus). A, Climbing a
. An introduction to zoology, with directions for practical work (invertebrates). lie INTRODUCTION TO ZOOLOGY chap. Shell f to 1 inch in diameter, rounded on both sides. Whorls 5 or 6. Dark reddish brown in colour, very common in some localities, and always to be had readily from any dealer in aquatic specimens. Eggs 20 to 45 in a flat, oval capsule attached to a leaf. Easp with 67 teeth in each row, and 200 rows. Planorbis complanatus (= umbilicatus).âShell | inch dia- meter : 5 or 6 whorls. One side of the shell is flat or. Fig. 66.âThe Common Trumpet Snail {PlanorMs corneus). A, Climbing a piece of Canadian water-weed. B, Breatliing at tlie surface; r, respira- tory aperture. C, Seen from tiie left side, showing the projecting respiratory lobe of the mantle. concave, and hence there is a distinct heel, quite on one side of the middle line of the outer whorl. Mouth of shell rhomboidal. FlanwUs vortex {the Whirlpool Trumpet Snail).âShell | inch in diameter. Whorls 6 to 8. One side of the shell is convex, and one flat, and consequently here also there is a heel on one side of the body whorl. This species, which is fairly common, can endure drought, lying in a torpid state with the moiith of the shell closed by an " ; ^ 'â For explanation of this term see p. 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 Lulham, Rosalie Blanche Jermaine. London, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1913
