. Bollettino del museo di zoologia comparativa a Harvard College. Zoologia; Zoologia. Caratteristica di DEEP SEA tipi. lil!A( HIOPODS. 75 " Challenger " dall'acqua più profonda in cui qualsiasi molluschi non è ancora stata trovata vivere. Ci sono innumerevoli illustra- zioni di bellezza, adattamento o caratteristiche insolite che potrebbero essere citate, ma a quelle conoscono con gli oggetti stessi ad una enumerazione sarebbe noioso. L entusiasta studente e il collettore da solo può trovare piacere in ciò che TT . x Fig-. 312.-VesicoiTiya sembrerebbe per la maggior parte delle persone un secco com- venusta. lf. bination

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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. CHARACTERISTIC DEEP-SEA TYPES. lil!A( HIOPODS. 75 " Challenger " from the deepest water in which any bivalve has yet been found living. There are almost innumerable illustra- tions of beauty, adaptation, or unusual characteristics which might be cited, but to those unacquainted with the objects themselves such an enumeration would be tedious. The enthusiastic student and collector alone can find pleasure in what TT . x Fig-. 312.—VesicoiTiya would seem to most people a dry com- venusta. lf. bination of a lexicon and a catalogue. BRACHIOPODS. Until quite lately brachiopods were rarities in collections; but since the days of dredging expeditions we know that they are very numerous at favorable localities on rocky or stony bottoms. They do not seem to penetrate very great depths, naturally finding no point of attachment in the soft ooze of the deep waters, and but few species are thus far known to extend beyond 600 fathoms. The largest known species have been dredged from the abyssal region, and young specimens are frequently found attached to the older ones. None of the deep-water spe- cies have the brilliant coloring characteristic of the common lit- toral species belonging to the genus Lingula. The principal differences upon which their classification is based are those of the so-called loop, the calcified support of the brachia, and the structural details of the valves. The recent brachiopods are specially interesting as represen- tatives of a group which attained an extraordinary development in very early ages, and has been represented in all formations. They have a most extensive geographical distribution, and a great bathymetrical range. They are found at all levels, from pools left by the tides to a depth of 3, 000 fathoms. The num- ber of living species is small compared to the hosts which flour- ished in the silurian. devonian, and carboniferous, from which time t

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• bookauthorha
• bookcentury1800
• bookdecade1860
• booksubjectzoology