Cyatheaceæ

Order of Ferns, including many of the tropical, tree-like species. Cyathiform. Hollow, cup-shaped structures. ural family of flowering plants of the cla Angio- spermæ and sub-cla Mo- no cotyledons, comprising 6 genera and ab. 35 species, all natives of tropical Amer- ica. IMG:content-1065.jpg:[graphic] point to another not in the same vertical line, and the curve on which the vibrations of a pen- dulum are equal regardle of the arc traversed. In mechanics, curve for the profiles of the gear teeth in a rack. IMG:content-1066.jpg:[graphic] IMG:content-1067.png:[blocks in formation] Cycloidei. Group of fishes whose scales are entire, with | plants. smooth edges, and whose fin-rays are soft as those of the salmon. See PHYSOSTOMI. Cyclo me top a (CANCROIDEA or ARCUATA). See CRABS. Cyclo my aria. Group of Thalli ace a , including Doliolum . ture of whose cells (cystids) are wide, terminal, and without movable appendages. Most are fo il, and have been grouped into the Articulata (or Radicel lati ) and the Inarticulata (or Incrust at a ). The former, including only the Crisiadæ, are stalked forms; the latter include several families of Polyzoa that form incrusting colonies.