from The Century Dictionary and Cyclopedia
- In Lamarck's classification (1812), the seventh family of polythalamous testaceous cephalopods, including most of the Tetrabran-chiata, having an involute shell with sinuous partitions between the chambers.
- Now, an extinct order of the class Cephalopoda, including cephalopods intermediate between Dibranchiata and Tetrabranchiata.
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