. Zoology : for students and general readers . Zoology. 266 ZOOLOGY. showing the lung and heart (/«) .ind the mouth (»*) as well as the four tentacles, with an eye at the end of the two upper tentacles. Fig. 203 shows the brain and pedal ganglia of Helix alhola- Iris. The tentacles when carefully exam- ined may be found to contain both the eyes (<?) with the optic nerve {op) and the olfactory nerve'(Fig. 206, o). Fig. 204 represents the jaw and lingual ribbon of Helix. Tlie eggs of the pond-snails are laid in transparent capsules attached to sub- merged leaves, etc. Those of Physa heterostr
. Zoology : for students and general readers . Zoology. 266 ZOOLOGY. showing the lung and heart (/«) .ind the mouth (»*) as well as the four tentacles, with an eye at the end of the two upper tentacles. Fig. 203 shows the brain and pedal ganglia of Helix alhola- Iris. The tentacles when carefully exam- ined may be found to contain both the eyes (<?) with the optic nerve {op) and the olfactory nerve'(Fig. 206, o). Fig. 204 represents the jaw and lingual ribbon of Helix. Tlie eggs of the pond-snails are laid in transparent capsules attached to sub- merged leaves, etc. Those of Physa heterostropha are laid in the early spring, and three or four weeks later from fifty to sixty embryos with well-formed shells may mgAm.—Limn cats ap- be fouud in the caj)sule. presms.—Pdt&v Morse. rT\^ £ t t ° n i i_ • ihe eggs ot Lymnceus are laid late m tlie spring in capsules containing one or two eggs, and sur- rounded by a mass of jelly. After passing through the mo-. 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
