Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 PTEROPODA. 67 44. The Carinari^ have the abdomen (that is to say, a kind of sac enclosing the heart, the liver and some other organs) covered by a symmetrical and conical shell, the apex of which is curved backwards, and the anterior edge covers the base of the branchiae {Jig. 86, hr). There is one species in the Mediterra- nean, but three have been discovered. The FiOROL^ have no shell, but, in other respects, very much resemble the Carinarise. CIiASS OF MO
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 PTEROPODA. 67 44. The Carinari^ have the abdomen (that is to say, a kind of sac enclosing the heart, the liver and some other organs) covered by a symmetrical and conical shell, the apex of which is curved backwards, and the anterior edge covers the base of the branchiae {Jig. 86, hr). There is one species in the Mediterra- nean, but three have been discovered. The FiOROL^ have no shell, but, in other respects, very much resemble the Carinarise. CIiASS OF MOIiZiVSCA. 45. The mollusks composing this group are organized for swimming only: they possess no organ by means of which they can crawl, or even attach themselves to submarine bodies, but continually float in the sea, and move by the assistance of fins, placed like wings on each side of the mouth {fig. 87). They are all of small size, and most of them inhabit the seas of warm countries; but they arc also found in the neighbourhood of the poles. The Clio borealis, for example, abounds so exten- sively in the arctic regions, that, in spite of their very small size (scarcely an inch long), they become, in certain seasons, the ordinary food of whales. Their form varies much : some of them are naked: others are provided with a shell. They constitute several genera, the principal of which are the Clio, Hyalea, Cleodora, Cymbulia, &c. Fig. 87 HYALEA. 44. What are the characters of the genus Carina'ria ? (Carinaria ; from the Latin, cari'na, a keel.) 45. How are the Pte'ropoda characterized ? (Pteropoda; from the Greek, pteron, wing, and pons, foot.)
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