70 CLASSIFICATIONS OF ZOOPHYTES. 



Hippothoa. 

 Alecto. 

 A A. Substance flexible. — Flustrad^. 

 Farcimia. 

 Flustra. 



III. Thecata. 

 Polypi surrounded by a membranaceous tube, covering 



THE subdivisions OF THEIR COMPOUND BODY. 



A. Sheath slightly calcareous ; cells single, or in rows. 



I. Sheath slightly calcareous, cells enlarged, in rows, united or 

 single. — Cellariad^. 

 a. Cells united. 



b. Cells with the orifices opening on the upper surface. 

 Cellularia. 

 Tricellaria. 

 Crisia. 

 b b. Cells in pairs, attached by the back, the orifices 

 with opposite aspects. 

 Notamia. 

 a a. Cells single. 



Eucratia. 

 Anguinaria. 

 A A. Sheath membranaceous, cells enlarged externally and lateral, 



SERTULARIADiE. 



I. Base of the cells broad, coalescing with the stem. 

 a. Cells on opposite sides of the stem. 

 Sertularia. 

 Dynamena. 

 Thuiaria. 

 a a. Cells unilateral. 



Antennularia. 

 Plumularia. 

 Serialaria. 

 II. Base of the cells narrow, or pedunculated. 

 Campanulai'ia. 

 Valkeria. 

 Cymodocia. 

 AAA. Sheath membranaceous ; the cells are the simple extremities 

 of the branches. — Tubulariad^e. 

 Tubularia. 

 Plumatella. 



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