214 ZOOPHYTES. 



This species is remarkable for its very light, almost spongy texture, 

 and its regularly circular cells, with a neat and extremely thin border, 

 as seen on a worn surface. The rays are delicate and about twelve in 

 number. The porous centre of the star is about a third the whole 

 diameter. Only a worn specimen has been seen by the author, and 

 Ellis's figure was made from a similar one. 



Mad. pleiades, Ellis and Sol., 169, tab. 53, -* , Latnour., Exp. Meth. 58, tab. 53, 



figs. 7, 8. figs. 7, 8 ; Encyc. 131, pi. 486, figs. 7, 8. 



Astrcea pleiades, Lamk. ii. 408, No. 11. A. Tubastrcea pleiades, Blainv., Man. 368. 



11. A. OEBICELLA ANNULARIS. (Lamarck.) 



A. polypis parvulis (1J'"), lamellis 24. CoraUum cellulosum ; cellis 

 orbiculatis, 1'" vix superantibus, 10-12 radiis tenuibus et aliis inter- 

 mediis obsoktis ; interstitiis plano-concavis : transverse secto, septis 

 cellulosis cum cettulis minutis in media scepissime uniseriatis, raro 

 biseriatis. 



Polyps small (l lines broad), with 24 internal lamellae. Corallum 

 cellular ; cells orbiculate, scarcely over a line broad, 10 to 12 slender 

 rays, and others intermediate obsolete ; interstices plano-concave : 

 in a transverse section, septa cellular, with the cellules minute, 

 usually in a single medial series, rarely in two series. 



Plate 10, fig. 6, transverse section of corallum, natural size. 



West Indies. Ellis, Lamarck. 



This species has circular cells nearly of the size in the pleiades, but 

 the texture is much heavier, and the cellules of the septa in a trans- 

 verse section are mostly in a single series along the middle of the 

 same, leaving a solid ring around the star nearly a quarter of a line 

 thick. The porous centre of the star rather exceeds one-third the 

 breadth of the same. The author has seen a worn specimen from the 

 Barbadoes ; it was three inches in diameter, and had a convex surface. 



Mad. annidaris, Ellis and Solander, 169, A. Tubastrcea annularis, Blainville, Man. 



tab. 53, figs. 1, 2 ; a good figure of a 368. 



worn specimen. Explanaria annulata, Ehrenb., G. 1., sp. 7. 



Astrcea annularis, Lamk., ii. 405, No. 3. The A. annularis, of Quoy and Gaymard, 



- , Lamouroux, Exp. Meth. 58, tab. 53, (Voy. de 1'Ast. iv. 209, pi. 17, figs. 17, 



figs. 1,2; Encyc. 131, pi. 486, figs. 1, 2. 18,) is another species (see A. speciosa). 



