TRIBE I. ASTR^ACEA. 211 



the coronata in the fewer rays, rather larger cells, and more finely 

 striate exterior to the calicles. Ellis represents the points of the 

 corona within the cell as but six to eight in number, and the interme- 

 diate lamellae between the larger, as obsolescent. 



Mad. rolulosa, Ellis and Sol., 166, tab. 55. Favia rotulosa, Ehrenberg, G. lix. sp. 7. 



Astrcea rotulosa, Lamarck, ij. 405, No. 4. Esper's Madrepora aeropora, (Pflanz. Fort- 



, Lamouroux, Exp. Meth. 58, tab. 55; setz. i. tab. 38) may be this species 



Encyc., 129. badly represented. 



7. A. ORBICELLA CORONATA. (Dana.) 



A. convexa, subglobosa ; polypis prominulis, 2-3'" latis, lamettis 36. 

 Corallum subcellulosum, caliculis breviter cylindricis ; lamettis in- 

 cequalibus et in&qualiter ezsertis, numerosis ; cellis 2'" latis, orbicu- 

 latis, subprofundis, intus per 10-12 denticulos coronatis: transverse 

 secto, septisfere solidis, sceperaris cettulis, inter dum numerosis ; stellis 

 multiradiatis, cellulis simplicibus. 



Convex, subglobose ; polyps a little prominent, 2 to 3 lines broad, 

 with 36 internal lamellae. Corallum subcellular ; calicles very 

 short cylindrical with the lamellae unequal and unequally exsert, 

 numerous; cells 2 lines broad, circular, rather shallow, coronate 

 within with 10 to 12 minute points: in a transverse section, septa 

 nearly solid, often with delicate cellules, which are sometimes nu- 

 merous ; stars many-rayed, cellules simple. 



Plate 10, fig. 4 a, part of corallum, natural size; b, calicle enlarged; 

 c, outline of cell and lamellae ; d, vertical section natural size ; e, trans- 

 verse section, enlarged ; f, the same, showing natural size. 



Tahiti, and also the Feejee Islands, and Wake's Island, Pacific 

 Ocean. Exp. Exp. 



This species resembles the preceding ; but the rays to the cells and 

 the points of the corona are more numerous and crowded. The cali- 

 cles are placed obliquely in the specimen examined, so that one side 

 is often nearly a line higher than the other, which is sometimes almost 

 lost in the sides of the next cell. In a vertical section the part below 

 the cell is very fine cellular, while the septa, unless broad, are quite 

 solid ; when broad, there is a row of cellules along the middle. 



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