Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . ost of the genera, is added a pair ofinternal and much longer tentacula(d, d). The arms are much in-creased in size and of a more com-plicated structure, supporting ontheir internal surface numeroussuckers, and sometimes connectedtogether by a powerful muscular eyes are much larger and morecomplex, are no longer peduncu-lated, but lodged in orbits. Themouth is armed with two piercingand trenchant jaws, resembling inshape and in their vertical move-ments those of
Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . ost of the genera, is added a pair ofinternal and much longer tentacula(d, d). The arms are much in-creased in size and of a more com-plicated structure, supporting ontheir internal surface numeroussuckers, and sometimes connectedtogether by a powerful muscular eyes are much larger and morecomplex, are no longer peduncu-lated, but lodged in orbits. Themouth is armed with two piercingand trenchant jaws, resembling inshape and in their vertical move-ments those of the Nautilus, butwholly composed of horn. Thegills are two in number, each witlia ventricle appropriated to thebranchial circulation ; the systemiccirculation having a single mus-cular ventricle, as in the infundibulum {i) is a completemuscular tube, shaped like an in-verted funnel. The Dibranchiatespossess a gland and membranous re-ceptacle for secreting and expellingan inky fluid. The sexual organs arein distinct individuals, as in the Te-trabranchiate order. All the species of both orders of Cephalopods. Loligo vulgaris. CEPHALOPODA. 605 are aquatic and marine, and they are mostly nocturnal and gregariousin their habits. The Dibranchiate order may be subdivided into two tribes; theone provided with the eight ordinary arms and the two longer ten-tacles, hence c?d\ed Decopoda {fg. 219.) ; the other tribe withoutthe tentacles, and called Octopoda {Jig. 220). 220
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1850
