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Phil Trans. Roy. Soc. London B 2 4 6 , 3 8 1 - 4 8 5 . Fell, Η. B . ( 1 9 6 3 b ) . , Ann. , pp. 4 5 7 - 4 9 0 . Fell, Η. B . ( 1 9 6 5 ) . Breviora 2 1 9 , 1 - 1 7 . Fischer, A. G. ( 1 9 5 2 ) . In "Invertebrate Fossils" ( R . C. Moore, C. G. Lalicker, and A. G. Fischer, e d s . ) , p, 6 7 8 . McGraw-Hill, New York. Garrido, J . , and Blanco, J . ( 1 9 4 7 ) . Compt. Rend. 2 2 4 , 4 8 5 . Hörstadius, S. ( 1 9 3 9 ) . Publ Staz. Zool Napoli 17, 2 1 2 - 3 1 2 . Hozawa, S. ( 1 9 2 8 ) . Sei. Rept.

The number of species (more than 1900) is consider­ able. Their distribution is almost universal and the very high number of individuals makes them a dominant and characteristic element of many marine communities. Subphylum IV. Echinozoa The subphylum Echinozoa is the least clearly defined. It groups classes that are very different by appearance, organization, and way of life, and whose phyletic relationships are far from being elucidated. Funda­ mentally, they are forms that are globoid or cylindrical which never have arms.

Upper side, X 2 . 2 5 . ( F r o m Ubaghs, 1 9 6 8 d . ) B . Cothurnocystis elizae Bather (Stylophora, Up. Ordovician), upper side, X 2 . ( F r o m Ubaghs, 1 9 6 8 c . ) C. Dendrocystites sedgwicki Barrande (Homoiostelea, M. Ordovician), X 0 . 6 7 . ( F r o m Bather, 1 9 1 3 . ) 32 Georges Ubaghs of the stalk; the anus occupies an adoral or lateral position, but is never aboral. They have arms which enclose extensions of the body cavity, or articulated appendices outside the theca, the brachioles.

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