Archive image from page 726 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 CONCHIFERA. 711 prominent, they are said to be cord if or m. When they are inclined towards one another, so that their summits approximate, they are said to be opposed. The hooks in no case in- cline to the posterior side; but occasionally they disappear almost entirely, and, as in the Solens, exhibit no kind of prominence. In other instances again they project a great way, and form the most prominent part of the shell (Mytilus, Pinna), in which case the hooks
Archive image from page 726 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 CONCHIFERA. 711 prominent, they are said to be cord if or m. When they are inclined towards one another, so that their summits approximate, they are said to be opposed. The hooks in no case in- cline to the posterior side; but occasionally they disappear almost entirely, and, as in the Solens, exhibit no kind of prominence. In other instances again they project a great way, and form the most prominent part of the shell (Mytilus, Pinna), in which case the hooks are said to be terminal. 2. The belly of the shell comprises the greatest part of the exterior surface. It is bounded at the base of the hook, as also by the lunule and the corslet. It is more or less rounded or flattened according to the general form of the shell, and we shall speak of the dif- ferent points worthy of consideration con- nected with it when we come to define the various particulars of the external surface con- sidered in a general manner. Fig. 368 A. a, superior edge ; b, uncus ; c, luniila ; e, anterior edSe ; f> inferior edge ; g, posterior edge. - B.
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