724 ZOOPHYTES. 



Acrogenous. Growing upward indefinitely ( 61), increase taking place at summit. 



Prolate. The summits of the polyps widening by growth and budding. 



Stolon. A shoot or margin growing outward indefinitely, and gradually giving out buds 

 from above. 



Dichastic. (From (Ji^a^u, to subdivide spontaneously). The apparent subdividing of a 

 polyp arising from disk-budding. 



CoraMigenous. Forming coral secretions. 



Corallum. The solid secretions of zoophytes, whether calcareous, horny, suberose, or 

 siliceous ( 9, 46). 



Polypary, Polypifer, Polypidom. See Corallum. 



2. General Forms of Zoophytes. 



Glomerate. Massive; proceeding from acrogenous growth, and budding in every 

 direction. 



Explanate. Oblique or horizontal foliaceous ; proceeding from budding in a plane, 

 without acrogenous growth. 



Lamellate. Erect foliaceous ; the opposite surfaces of the erect plates similar. 



Arborescent. Forming ramose tree-like zoophytes. 



Fruticulose. Arborescent stems, clustered on a common base, and not forming an even- 

 top clump. 



Cespitose. Stems clustered on a common base and forming an even-top clump. 



Flabellate. Branching in a plane. 



Reticulate. Flabellate, with the branches and branchlets coalescing. 



Frond. Applied to a reticulate or flabellate zoophyte, or a folium of a foliate species. 

 In the reticulate or horizontally growing Madrepores, the term applies to the whole, in- 

 cluding the reticulate plate or base with the branchlets that cover it. 



Caliculato-ramose. Each calicle forming a separate branch to the corallum ; arising 

 from segregate budding. 



Patrio-ramose. Branches lengthening through the indefinite growth and lateral bud- 

 ding of a terminal polyp. 



Oumulato-ramose. Branches lengthening by buds at apex, the new polyps being suc- 

 cessively the terminal. 



Furcato-ramose. Branching by a spontaneous subdivision of the summit. 



3. Structure of Corallum. 



Cell (cella). A surface depression, corresponding more or less perfectly to the visceral 

 cavity of a polyp. 



Calicle (caliculus, a little cup}. A cup-like elevation containing a cell ; the result of 

 coral secretions within the sides of prominent polyps. (For their various forms among 

 the Madreporce, see page 432). 



Cellule, Porule. The pores in the internal texture of a corallum. 



Lamella. One of the radiating plates within a cell. 



Star (stella). The stars of radiating lamellae, seen in a transverse section of the cells 

 of some coralla ; also on the surface in some Fungidtr. 



Septum. The wall enclosing a cell, or that intervening between two cells in massive 

 species ; also the cross-partitions in the cells through the interior of some coralla (Favo- 

 sitidoe, Cyathophyllidae). 



