T R I B E I I I. M A D R E P O R A C E A. 56 I 



C. Glomeratce, aut lobato-glomcrata;. 

 I. Cellis excavatis. 



13. PORITES ASTR^OIDES. (Lesueur.) 



P. incrustans, undato-gibbosa, crassa ; polypis sulphureis ; tentaculisbrun- 

 neis, apice flavis punctura nigra notatis. Corallum robustum, cellis 

 majuscutis, subangulatis, aut orbiculatis, cylindricis et profundis, 

 lamellis radiatis 12 verticaKbus, centra columella brevissimd, septis sub- 

 acutis. 



Incrusting, undate arid somewhat, gibbous, polyps sulphur-yellow ; 

 tentacles brown, yellow at tip, with a black puncture at the extre- 

 mity. Corallum firm, cells rather large, subangular or circular, 

 cylindrical and deep, with 12 radiating lamellse, nearly vertical and 

 narrow, and at centre a very short colurnella. 



Guadaloupe, West Indies. Lesueur. 



The incrusting plates are thin when small, but often become quite 

 thick, and have an irregularly undulate or subgibbous surface. The 

 cells are peculiar in being distinctly 12-rayed, with the rays narrow 

 and vertical. 



Porites astrceoides, Lesueur, Mem. du Mus., , Blainville, Man., 395, pi. 61, fig. 5 ; 



vi. 287, pi. 16, fig. 15. a recognisable figure. 



Porites astrceoides, Lamk., ii. 435, No. 3. 



14. PORITES CONGLOMERATA. 



P. subglobosa, gibboso-glomerata. Corallum cellis angulatis paulum 

 excavatis, plano-conicis, vix majusculis ('") ; septis tenuissimis, acutis. 



Subglobose, gibboso-glomerate. Corallum having the cells angular, 

 quite shallow, flat-conical, rather small ( of a line) ; septa very thin 

 and acute. 



Plate 55, fig. 3, corallum, natural size; 3 a, cell, enlarged. 

 The Pacific and Indian Oceans. Feejee Islands. Exp. Exp. 



141 



