Beginners' zoology . A kind of HEART. LIVER C a LOME. ANT. POSTS Fig. 193. — Anatomy of Mussel. (Beddard.) MOLLUSCS lOI chamber for the gills is made by the joining of the mantleflaps below, along the ventral line. The mantle edges areseparated at two places, leaving openings called cxJialejitand inhaleJit sipJions. Fresh water with its oxygen, propelled by cilia at theopening and on the gills, enters through the lower orinhalent siphon, passes between the gills, and goes to anupper passage, leaving the gill chamber by a slit whichseparates the gills from the foot. ?X^

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921