TRIBE I. ASTR^EACEA. 249 



tissimis, spinoso-denticulatis : transverse secto, stellis multiradiatis, 

 radiis confer tis, cellulis minutis ; septisfere solidis. 



Lobed glomerate, lobes ascending and polygonal, as in the tesserifera. 

 Corallum firm and little cellular; cells 4 to 6 lines broad, angular, 

 shallow, patulous, short coronate within ; ridges triangular ; lamellae 

 narrow, spinoso-deriticulate : in a transverse section, stars multira- 

 diate, and rays closely crowded, with minute cellules; septa nearly 

 solid. 



Plate 13, fig. 10, part of corallum, natural size; 10 a, section of 

 cells, showing profile of lamellse ; 10 b, the same enlarged ; 10 c, 

 transverse section of corallum, natural size ; 10 d, vertical section of 

 same. 



Feejee Islands. Exp. Exp. 



The corallum is heavier and more solid than in the tesserifera. 

 Within a line of the margin of a cell, the lamellae are hardly one-fifth of 

 a line wide, while they are twice this in the tesserifera. They appear 

 as mere striations of the surface. The cellules between the lamellse of 

 the cell are much shorter ; and the cell has a much closer and more 

 compact appearance. The centre also is less loosely porous, and the 

 cellules through the corallum are very minute, the rays of the star 

 being crowded, and the transverse dissepiments numerous. 



C. SUPPLEMENT: UNARRANGED SPECIES. 



56. ASTR^A COMPLANATA. (H. 6f Ehrenberg.) 



A. effusa, brunnea. CoraUum pulvinatum, spinulasum ; cellis magnis, 

 4^-5'" latis, subrotundis, plants; interstitiis angustis, depressis, pas- 

 sim obsoktis. 



Effuse; brown. Corallum pulvinate, spinulous; cells large, 4 J to 5 

 lines broad, nearly circular, plane ; interstices narrow, depressed, 

 every where obsolescent. 



The Red Sea. (Ehrenberg.) 



Favia complanata, Ehrenberg, G. lix. sp. 3. 



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