. Zoology : for students and general readers . Zoology. AlTATdMr OF THE OLAM. the sandy bottom of the water, when the mussel ing its way through the sand with its tongue- shaped foot, which is a muscular organ attach- ed to the visceral mass, and is a modification of the under lip of the larval mollusk. In the foot is an orifice for the passage in and out of water, and the spurt- ing of water from the clam's hole, observed in walking over the flats, is the stream thus ejected from the foot. The inflowing currents of water pass from the inner end of the mus- cular siphon below the lenticular vi
. Zoology : for students and general readers . Zoology. AlTATdMr OF THE OLAM. the sandy bottom of the water, when the mussel ing its way through the sand with its tongue- shaped foot, which is a muscular organ attach- ed to the visceral mass, and is a modification of the under lip of the larval mollusk. In the foot is an orifice for the passage in and out of water, and the spurt- ing of water from the clam's hole, observed in walking over the flats, is the stream thus ejected from the foot. The inflowing currents of water pass from the inner end of the mus- cular siphon below the lenticular visceral mass to the mouth, which is situated at the anterior end of the shell, oppo- site the siphon. The opening is simijle, armed, without lips, and often difficult to detect. On each side of the mouth is a pair of flat, narrow-pointed appendages called pal- pi. The digestive ca- nal passes through a dark rounded mass, 243. Fig. 161.—^, Mya arenaria with its siphons ex- tended ; in its natural position in the mud hoad- end downwards ; B, transverse pcction of the shfll, showing the posilion of the sprinc; openint: the - . „ shell; iT/, adductor miipcle ; the lio'ament renresent- niOStly COnSlStinj^ OI ed hy dark mass ; f^. section of Unio, ehowincr the ., -. J position of the spring to open the shell; tne liver, covered ex- ment ; />. ideal transveri^e section of Unio; /, intes- , nil! • tine; Jf", foot; V, ventricle; A, auricle: G, gills: tenially by the ovarian at, mantle; S, ehell.—After 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
Size: 1012px × 2471px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
