. Zoology for high schools and colleges. Zoology. the sandy bottom of the water, when the mussel is plough- 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 iip of the larval mollusk. In the foot is an orifice for the passage m and out of water, but the spurt- ing of water from the clam's hole, observed in walking over the flats,is the stream eject- ed from the siphon. The inflowing currents of water pass from the inner end of the mus- cular siphon below the lenticular visceral mass to the m
. Zoology for high schools and colleges. Zoology. the sandy bottom of the water, when the mussel is plough- 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 iip of the larval mollusk. In the foot is an orifice for the passage m and out of water, but the spurt- ing of water from the clam's hole, observed in walking over the flats,is the stream eject- ed from the siphon. 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 simple, un- 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, mostly COnSlstmg Ol ed by dark mass ; C. section of Mya, showin?: the ,â¢, ,. ? position of the spring to open the shell; L. liga- tne liver, covered ex- ment;/), ideal transverse section of Unlo; /.intes- , n 1 ,1 â tine ; F, foot; V, ventricle ; A, auricle : G, gills : tenially by the ovarian m. mantle ; S, shell.âAfter Fig. 155.â^, Mya arenaHa with its siphons er- oded ; in its natural position in the mud head- end downwards; B, transverse section of TJnio, showing the position of the spring opening the shell; M, adductor muscle ; theli^ment represent-. 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, H. Holt and Company
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
