. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. proboscis of a phyllodoce, and^g. 67, that of a nereis). The surface is frequently beset with small papillae, and its extremity armed with Fig. 67. * See Annales des Sciences Nat. torn. xxii. t See Cuvier, Auat. Comparee, torn. i. ; Trevi- ranus, iiber der stachlichten Aphrodite, Zeitschrift fiir Physiolngie, 3 Band ; Moquin Tandon, " Mo- nograph, dcs Hirudines," Morrem, " Sur le Lom- bric," & horny jaws (m), the disposition of which varies in different genera. It is to be observed that these j
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. proboscis of a phyllodoce, and^g. 67, that of a nereis). The surface is frequently beset with small papillae, and its extremity armed with Fig. 67. * See Annales des Sciences Nat. torn. xxii. t See Cuvier, Auat. Comparee, torn. i. ; Trevi- ranus, iiber der stachlichten Aphrodite, Zeitschrift fiir Physiolngie, 3 Band ; Moquin Tandon, " Mo- nograph, dcs Hirudines," Morrem, " Sur le Lom- bric," & horny jaws (m), the disposition of which varies in different genera. It is to be observed that these jaws are almost always placed laterally like the mandibles of other articulate animals, and cannot act upon one another in the direc- tion of the axis of the body, as in the vertebrata, but are not to be regarded as analogous to the mandibles and maxillae of insects and Crustacea. In their structure, the jaws of the annelida ap- proximate rather to the solid plates with which the interior of the stomach in some Crustacea is provided, and to the hooks which arm the mouth of certain gasteropodous molluscs. This conformation of the oral apparatus is met with only in the aunelida errantia; in the annelida terricola there is scarcely a vestige of a proboscis, and never any teeth or jaws. In the annelida suctoria, the mouth, which is placed at the bottom of the cephalic sucker, is also occasionally protruded in the form of a small tubular proboscis, and in other species its margins are armed with little horny jaws ; lastly, in the annelida tubicola, nothing of the kind is to be seen, but in general the superior border of the mouth forms a sort of projecting lip, which is provided with long tentacles, sometimes simple and filiform, sometimes pec- tinated and resembling tufts. In certain erratic annelida, the Agliope, for example, there are also found around the mouth small tentacula, which are quite distinct from the tentacular cirri, and which appear to be analogous to the appendages
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