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Webster's 1913 Dictionary

RHIZOCEPHALA

Rhi `zo *ceph "a *la, n. pl. Etym: [NL. , fr. Gr. (Zoöl.)

 

Defn: A division of Pectostraca including saclike parasites of Crustacea. They adhere by rootlike extensions of the head. See Illusration in Appendix.