TRIBE I. ASTR^EACEA. OQ7 



margine rotundatis ; interstitiis concavis, radiato-striatis ; cellis pro- 

 fundis aut subprofundis ; lamellis angustis. 



Convex. Corallam with the calicles 1 to H lines distant, cylindrical, 

 5 to 6 lines broad, rounded at the margin ; interstices concave, ra- 

 diately striate ; cells deep ; lamellae narrow. 



West Indies. Ellis and Solander. Lamarck. 



The very prominent calicles with wide concave interstices separate 

 this species from its congeners. It resembles the A. speciosa ; but dif- 

 fers in its more remote calicles, and also its interstitial mode of bud- 

 ding. The internal texture, as figured by Ellis, is quite coarsely 

 cellular. 



Mad. radiuta, Ellis and Solander, 169, tab. , Lamour., Exp. 57, tab. 47, fig. 8 ; 



47, fig. 8. Encyc., 132. 



Mad. astroitis, var. Pallas Zooph., 320. A. Tubaslrcearadiata, Blainville, Man. 368. 



Astrcea racliata, Lamarck, ii. 404, No. 1. Explanaria radiata, Ehrenberg, G. 1. sp. 6. 



2. A. ORBICELLA ARGUS. (Lamarck.) 



A. subhemispherica ; polypis 5'" latis,prom.inulis ; lamellis 48.* Corallum 

 subsolidum, caliculis brevissime conicis, polygonis, et 1'" allis, extus 

 confer tim regulariterque striatis et denticulatis; cellis orbiculatis, 3'" 

 latis, paulo profundis, fundo latis ; lamellis tenuibus, denticulatis: 

 transverse secto, stellis multiradiatis, cellulis simplicibus; septis fere 

 solidis, paucis cellulis lineatis vel > -formibus. 



Subhemispherical, polyps mostly 5 lines broad, a little prominent, with 

 48 internal lamellse. Corallum nearly solid; calicles very short, 

 conical, polygonal, 1 line high, exterior crowdedly and very evenly 

 striate arid denticulate; cells circular, 3 lines broad, rather shallow, 

 broad at bottom; lamellaB thin, denticulate, in a transverse section, 

 stars multiradiate, with the cellules simple; septa nearly solid, with 

 a few linear or > - form cellules. 



Plate 10, fig. 1 a, transverse section; 1 b, vertical section; also, p. 75. 



* The number here given includes all the lamella;, large and small, in the adult calicle, 

 or what is equivalent, the number of strice on the exterior of the calicle. 



