| 单词 | phragmacone |
| 例句 | The most ancient forms characterized by the small size of the rostrum and pro�stracum, and large size of the phragmacone. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Internal shell without a distinct phragmacone, calcified or simply chitinous. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Extinct; phragmacone with widely separated septa; rostrum well developed and claviform. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Belosepia, a rudiment of rostrum and phragmacone present in shell, Eocene. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" In the living Dibranchiata other than Spirula the phragmacone and rostrum have become very rudimentary. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Extinct; rostrum and phragmacone well developed, phragmacone often curved; initial chamber small. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" In fossil genera and Spirula, shell has a multilocular phragmacone with a siphuncle; initial chamber globular and larger than the second chamber. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" |
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