216 ZOOPHYTES. 



13. A. ORBICELLA STELLIGERA. (Dana.} 



A. convexa et subgibbosa ; polypis 1J'" latis, discis raro gemmatis et 

 dichasticis ; lamellis 18. Corattum subcellulosum ; cellis parvulis (|" ; 

 latis), bene orbiculatis, interdum oblongis, vix profundis, intus minute 

 coronatis ; inter stitiis concavis; lamellis parce prominulis, supra sep- 

 tum eleganter radiatis, intus abruptis : transverse secto, septis fere 

 solidis, stettis pauciradiatis (6-8 radiis majoribus). 



Convex and subgibbous ; polyps 1 J lines broad, disks rarely budding 

 and dichastic; 18 internal lamellae. Corallura subcellular; cells 

 quite small (| of a line broad), neatly orbiculate, sometimes oblong 

 and dichastic, rather shallow, within minutely coronate; interstices 

 concave; lamella slightly prominent, neatly radiating upon the 

 septum around the cell, abrupt within : in a transverse section, 

 the septa nearly solid, stars few-rayed (6 to 8 larger). 



Plate 10, fig. 9, surface of corallum, natural size; 9 a, profile of 

 cell and lamellae ; b, lamella enlarged ; c, vertical section, natural 

 size ; d, transverse do. ; 9 e, transverse section enlarged. 



Feejee Islands. Exp. Exp. 



The neatly radiate lamellae that form a border to each star, upon 

 the septum, together with the very compact texture and the shallow 

 coronate cell, abrupt within, form good characters for distinguishing 

 this species. The circle of radiating lamellae consists of fifteen to 

 eighteen ; they are quite even and have a gradual outward slope. 

 The interstices are generally more than half the breadth of the cell. 



14. A. ORBICELLA (?) cRispATA. (Lamarck.) 



C. incrustans, cellis suborbiculatis, infundibuliformibus, margine sepa- 

 ratis, multilamellosis, lamellis denticulatis. 



Corallum incrusting; cells nearly circular, infundibuliform, separated 

 along the ridge, multilamellate ; lamellae denticulate. 



Indian Ocean. Perm and Lesueur. 



