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TRIBE m.-~-MADEEPORACEA. 
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Genus 2. Sideropora. Coralla with obtuse branches ; cells containing a 
distinct star of six rays, meeting in a short columella at centre-— not seriate, | 
distinctly traceable within the corail um. I 
Genus 3. Seriatofora. Coralla with very slender terete branches, often | 
pointed; cells seriate; texture very solid, and cells, therefore, not traceable , 
within the coralla. ® 
Genus 4. Poctllopora. Coralla with the branches never terete ; surface ; 
usually verrucose, and cells traceable within, except w'hen quite slender ; tex- 1 
ture mostly very compact; lamellae nearly obsolete. ^ ; 
Genus 5. Favosites. Coralla consisting of agglomerated prismatic cells. ^ i 
Genus 6. Catenipora. Coralla consisting of single lines of cells, form- 1 
ing meandering vertical plates, which plates often intersect one another. I 
Subfamily 3. HELIOPORINJS. Cells circular, not contiguous. | 
Genus 7. Heliopora. Cells with narrow radiating lamellae; texture of^ 
the interstices minute tubular. 
Genus 8. Heliolites. 
cellular. 
Cells with narrow lamellae ; interstices irregularly | , 
Genus 9. Millepora. Cells very minute ; rays obsolete ; texture of the 
interstices quite compact or sparingly porous. 
Family III. — PORITID^. f 
Cells shallow, hardly traceable within the coralla, which are throughout ^ 
fine-porous. | I 
Genus 1. Porites. Coralla glomerate or furcato-ramose ; cells not over j j 
a line in diameter; (polyps with twelve short tentacles.) 
Genus 2. Goniopora. Coralla glomerate or columnar; cells over a line | 
in diameter; (polyps with sixteen to twenty-four tentacles). 
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Family I.— MADREPORIDiE. * 
Polyps not coralligenous at middle of base ; cells of the co- 
rallum therefore, very deep, and not crossed by septa within. 
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Genus I.— MADEEPOKA. — ^Linn. 
Patrio-ramose ; arborescent, cespitose, or through coalescence, : 
reticulate or foliaceous. Coralla with the branches terete (very 
rarely compressed) ; calicles regular. 
