Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 when the sea is calm. Six of its tentacula are (hen folded be- neath and act as oars, and it is pretended that the two others, the extremities of which are enlarged and raised up, are spread for sails, as represented in the figure (12) ; but we should not infer from their structure that these tentacula are adapted to such a purpose. The common species is found in the Mediterranean, the Indian Ocean, &c.; it was known to the ancients under the name of nautilu
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 when the sea is calm. Six of its tentacula are (hen folded be- neath and act as oars, and it is pretended that the two others, the extremities of which are enlarged and raised up, are spread for sails, as represented in the figure (12) ; but we should not infer from their structure that these tentacula are adapted to such a purpose. The common species is found in the Mediterranean, the Indian Ocean, &c.; it was known to the ancients under the name of nautilus, and pompilius. 20. The Calmaries—Loligo—differ from the preceding in their elongated sack, and being provided with two terminal fins, by the horny lamina, lodged in v the back, which supplies --^^^^^^. the place of shell, and by their tentacula, which are ten in number, and not of the same configura- tion throughout {fg. 13). ^'^' common calmary. Eight of these feet are of moderate size, and are armed with little cups in their whole length, while the two others are very much elongated and have cups only near their extremities. 21. The CalmARETs—Zo- ligopsis—are remarkable for the great length of two of their arms {fg. 14), which are fili- form, and widened at the end only ; in other respects they difier but little from the Cal- maries : they are found in the Mediterranean. 22. Certain cephalopods, which resemble the Calmaries very much, but have their long arms furnished with hooks, form the genus of Onychoteuthis (from the Greek onvx, in the genitive onvchos, nail, and tevthis, a calmary, that is, a calmary with nails. '23. The CuTTLE-FlSHES Fig. 14—THE CALMARET. —Scpiu—have the tentacular 20. How do the Calmaries differ from tlie Argonauts ? 21. What are Calmarets? 22. What is the ony'choteuthis ? (pronounced o-ni-ko-tu-this.) 23. What are the general characters of the cuttle-fish ? Of what use is cuttle-fish bone ?
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