. The physiology of the Invertebrata. lled liver (pancreas) is a large organ consisting of numerousramified follicles. There are usually two ducts from thisorgan, communicating with the cardiac portion of the alimentary canal is freely suspended in the body cavityby delicate membranes which stretch from the body walls. The Mollusca. The Mollusca form the second division of the MalacozoicSeries; and this division comprises seven orders. (i) The Zamellibranchiata include the Ostrea, Anodonta,Mytilus, Feden, Cardium, Mya, Unis, &c. The mouth isbounded by lips, which are usually produc
. The physiology of the Invertebrata. lled liver (pancreas) is a large organ consisting of numerousramified follicles. There are usually two ducts from thisorgan, communicating with the cardiac portion of the alimentary canal is freely suspended in the body cavityby delicate membranes which stretch from the body walls. The Mollusca. The Mollusca form the second division of the MalacozoicSeries; and this division comprises seven orders. (i) The Zamellibranchiata include the Ostrea, Anodonta,Mytilus, Feden, Cardium, Mya, Unis, &c. The mouth isbounded by lips, which are usually produced into two labial?palps. These palps are ciliated, and by the action of the cilia•food particles, which have passed into the branchial chamber,are driven into the mouth. The mouth of a Lamellibranch 68 ? PHYSIOLOGY OF THE INVERTEBRATA. carries no organs—;jaws or teeth—for the prehension ormastication of food particles. It passes by a short oesophagus-(Pig. l8) into an expanded stomach, which is embedded im r^-^S S v. A.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinverte, bookyear1892
