TRIBE I. ASTR^EACEA. 241 



IV. Collibus integris; lamellis cequalibus; cettis intus coronatis; corallo transversl 

 secto, cettulis steUarum simplicibus. 



44. ASTR^EA PENTAGON A. (Esper.) Ehrenberg. 



A. semigbbosa. Corallum cettis angulatis scepius pentagonis, 4J-5'" 

 latis, incequalibus, inter dum oblongis, intus bene coronatis; centra, 

 appendice columnari ; collibus angustis, obtusis vel subacutis. 



Semiglobose. Corallum with the cells angular, usually pentagonal, 

 4J to 5 lines broad, unequal, sometimes oblong, neatly coronate 

 within, a columnar appendage at centre ; ridges narrow, obtuse, or 

 subacute. 



East Indies. Esper. 



Ehrenberg gives four and a half inches as the breadth of a specimen 

 of this species. Esper describes the cells as rather shallow, and 

 usually pentagonal in form, and the lamellae as alternately large and 

 small. His figure represents the corona within the cell as consisting 

 of nine or ten teeth, and surrounding a prominent point at centre. 



Mad. pentago?ia, Esper, Fortsetz. i. 13, Aslrtea. pentagona, Ehrenberg, op. cit., G. 

 tab. 39. The cells in the figure are badly lx. sp. 5. 

 shaded, and scarcely appear excavate. 



45. ASTHMA FAVISTELLA. (Dana.) 



A. subhemispherica. Corallum cellulosum ; cettis bene polygonatis, sub- 

 prof undis, scepius 3-4'" latis, intus coronatis ; collibus fere I'" crassis, 

 integris, Gothicis, subacutis; lamellis subintegris, cequalibus : trans- 

 verse secto, stellis vix multiradiatis, cum cettulis simplicibus ; septis 

 J'" angustioribus, cettulis minutissimis, aut obsoletis, uniseriatis. 



Subhemispherical. Corallum cellular, rather light; cells neatly an- 

 gular, rather shallow, mostly 3 to 4 lines broad, coronate within; 

 ridges about a line thick, entire, Gothic, subacute; lamellae sub- 

 entire and very even, abrupt within: in a transverse section, stars 

 scarcely many-rayed, with the cellules simple ; septa not half a line 

 thick, with very minute cellules, uniseriate, sometimes obsolete. 



61 



