The Cambridge natural history . FiG. 74.—Solecurtus strigillatus L., Fig. 75.—Mytilus edulis L., attached by its byssiis Naples: , aflereiit siphon; (By) to a piece of wood : F, foot; S, aual siphon, , efferent siphon, the two the brancliial siphon being below it and not uniting in SS to the closed. (After Mcibius.)shell. X J. siderably. It appears proliable that the different degrees ofcomplication of the gill indicate degrees of specialisation in thedifferent groups of Pelecypoda, in other words, assuming that asimpler form of gill precedes, in point of development, a mor
The Cambridge natural history . FiG. 74.—Solecurtus strigillatus L., Fig. 75.—Mytilus edulis L., attached by its byssiis Naples: , aflereiit siphon; (By) to a piece of wood : F, foot; S, aual siphon, , efferent siphon, the two the brancliial siphon being below it and not uniting in SS to the closed. (After Mcibius.)shell. X J. siderably. It appears proliable that the different degrees ofcomplication of the gill indicate degrees of specialisation in thedifferent groups of Pelecypoda, in other words, assuming that asimpler form of gill precedes, in point of development, a morecomplicated form, the nature of the gill may be taken as indicat-ing different degrees of removal from the primitive form ofbivalve. 166 THE GILL IN PELECYPODA 1. The simplest form of gill {Nucula, Lcda, Solenomya, etc.) isthat which consists (Fig. 7G, A, compare Pig. 100, p. 201) of tworows of very short, broad, not reflected filaments, the rows beingplaced in such a way that they incline at right angles to oneanother fro
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
