. Zoology : for students and general readers . Zoology. ANATOMY OF THE CLAM. 247 eggs as they are dis- gills, where the embryos in some species partially develop. Impregnation probably takes place within the branchial chamber, the spermatozoa being swept in with the respiratory current, and coming in contact with tlie charged. An excellent general view of tlie relation of parts to the body-walls and shell may be seen by hardening a clam, or better a fresh-water mussel, Unio (see Fig. 161, D) in alco- hol, and then making trans- verse sections. A section can be floated oft' in water and ex- ami
. Zoology : for students and general readers . Zoology. ANATOMY OF THE CLAM. 247 eggs as they are dis- gills, where the embryos in some species partially develop. Impregnation probably takes place within the branchial chamber, the spermatozoa being swept in with the respiratory current, and coming in contact with tlie charged. An excellent general view of tlie relation of parts to the body-walls and shell may be seen by hardening a clam, or better a fresh-water mussel, Unio (see Fig. 161, D) in alco- hol, and then making trans- verse sections. A section can be floated oft' in water and ex- amined with a lens. The jDer- fect bilateral symmetry of parts will thus be seen. The above description will answer for the majority of lar. Fig. 166. — Pedal ganglia and oto- cyets (ears) of the clam, magnified 10 diameters, d, pedal ganglia; e, pedal commisaures;/, line of union of gan- glia ; g, nerve from commissure to muscles of foot; h, auditory nerve ; i, octocysfc; k, nerves from ganglia to the pedal muscles.—Drawn uy W. K. 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
