| 释义 |
ˈphragmocone Zool.
Also erron. phragma-.
[f. Gr. ϕραγµό-ς fence (or ϕραγµο- = ϕραγµατο-: see phragma, and cf. σπερµο-) + κῶνος cone.]
The conical chambered internal skeleton of a fossil belemnite; also, by extension, the corresponding spiral or otherwise-shaped part in other fossil cephalopods.
1847Nat. Encycl. I. 141 (Actinocamax) The species..had no true alveolar cavity or phragmacone. 1851–6Woodward Mollusca 48 Its phragmocone is but the representative of the calcareous axis (or splanchno-skeleton) of a coral. 1862Dana Man. Geol. 451 [In Belemnites] a small chambered cone, called the phragmocone..which has a siphuncle. 1888Rolleston & Jackson Anim. Life 457 The chambered shell..known in Belemnitidae as ‘phragmacone’.
Hence phragmoˈconic a., of, pertaining to, or of the nature of the phragmocone of a belemnite.
1890in Cent. Dict. |