. Elementary text-book of zoology. 270 MOLLUSC A. whole body is completely enclosed in a pair of large oval shells which, unlike the shells of Brachiofoda, are lateral. The animal is found half buried in the mud of ponds and streams. The shells are of a dark brownish-black colour and composed of the same three layers as in External ^^^ ^^^jj^ ^^ ^^ ^^^^^ ^j^^ ^^^ ^^^^ against Features. ^^^ ^^^^ ^^ ^ hinge, and they can be opened by the contraction of an elastic ligament, just outside the hinge Just above the hinge is a small first-formed part Fig. 189.âLateral View (Left) of Anodonta in Natura
. Elementary text-book of zoology. 270 MOLLUSC A. whole body is completely enclosed in a pair of large oval shells which, unlike the shells of Brachiofoda, are lateral. The animal is found half buried in the mud of ponds and streams. The shells are of a dark brownish-black colour and composed of the same three layers as in External ^^^ ^^^jj^ ^^ ^^ ^^^^^ ^j^^ ^^^ ^^^^ against Features. ^^^ ^^^^ ^^ ^ hinge, and they can be opened by the contraction of an elastic ligament, just outside the hinge Just above the hinge is a small first-formed part Fig. 189.âLateral View (Left) of Anodonta in Natural Position and Feeding. (Mainly after Howes.) Exhalent Current. Exhalent Tube. Water current passing into Inlialent : , Aperture; Lines of Growth. Level of Mud. called the umbo. On the inside, the dried shells have several scars caused by the attachment of parts of the body. A Httle way inside and parallel to the ventral edge of the shell is a line called the pallial line, caused by the edge of the mantle, or pallium. â At the anterior end of the pallial line is a large oval scar produced by the anterior adductor muscle; and at the posterior end is. 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 Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1902
