SUPPLEMENT 

 TO THE DESCRIPTION OF SPECIES. 



THIS Supplement includes the following genera of doubtful or un- 

 determined character: Allopora, Myriozoum, Pustulopora, Coscino- 

 pora, Receptacnlites, Tetradium, Theonea, Limaria, Stromatopora, 

 Chaunopora, Distichopora, Orbulites, Marginopora, and Polytrema. 



GENUS ALLOPORA. EHRENBERG. 



Cumulato-ramosa, polypis uni-gemmatis. Corallum cakareum, solidum, 

 stellis internis nullis, caliculis prominulis, cellis profundioribus, lineam 

 non superantibus, infundibuliformibus, margine uniseriatim ceUuloso 

 et crenato. 



Cumulato-ramose, each polyp giving out, in succession, a single bud 

 (branchlets therefore zigzag). Corallum calcareous and solid, not 

 at all penetrated by stellate cells; calicles somewhat prominent, 

 cells quite deep, less than a line broad, funnel-shape, margin crenate, 

 and having a series of cellules between the crenatures. 



This genus was established by Ehrenberg for a coral that has the 

 compactness of the Corallium rubrum, and appears like that to be an 

 axis of an incrusting zoophyte, although there are distinct cells. A 

 single species belongs to the Expedition collections, and was ob- 

 tained in the Pacific. The Oculina flabelliformis and O. rosea, as 



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