TRIBE I. ASTR^EACEA. 219 



(raro 2'") ; lameUis angustissimis et subtilissime denticulatis, 6-12 pro- 

 minulioribus ; collibus plants, viz lineam latis, minutissime et confertis- 

 sime lamello-striatis : transverse secto, stellispolygonis, scepius 2'" latis, 

 confertim multiradiatis, centra solidis. 



Incrusting and glomerate, sometimes subglobose. Corallum subcel- 

 lular; cells immersed, rather deep, mostly 1J lines broad, lamellae 

 very narrow, and very minutely denticulate, 6 to 10 a little more 

 prominent than the others ; septa plane, scarcely a line broad, very 

 closely and finely lamello-striate : in a transverse section, stars 

 polygonal, mostly 2 lines broad, crowdedly multiradiate, with the 

 centre solid. 



Plate 10, figure 12, surface of corallum natural size; 12 a, same, 

 another variety; 12 b, transverse section of the variety fig. 12, natural 

 size ; 12 c, same enlarged ; 12 d, transverse section of the variety 

 fig. 12 a. 



West Indies, Martinique. Lamouroux. East Indies, Lamarck, 

 Acad. Nat. Sci., Philad. 



This species occurs in subglobose masses, and also as incrustations. 

 Both varieties are common in the West Indies ; one specimen of the 

 former (part of the surface of which is represented in fig. 12.), is 2 

 inches in diameter and appears to have had no point of attachment. 

 The incrusting specimens (figure 12 a) are convex, and sometimes 

 nearly hemispherical. The two varieties may possibly be different 

 species, but the characters observed do not appear to be sufficient to 

 distinguish them. The lamellae of the cells are minute, and nearly in 

 contact laterally, with about twelve a little prominent in the largest 

 cells, and three smaller intermediate, making forty-eight in all. In 

 the majority of the cells which are smaller, the number is less. The 

 buds open in the interstices and the cells are never dichastic. The 

 species has close relations to the Mycedia and Psammocorae. 



Mad. galaxea, Ellis and Sol., 168, tab. 47, Astrcea galaxea, Lamour., Exp. 60, tab. 47, 



fig. 7. fig. 7 ; Encyc., 126. 



Mad. Astroites, Esper, Pfianz. Fortsetz. i. , Lamarck, ii. 418, No. 31. 



12, tab. 35, an incrusting specimen ; the A. Siderastrcea gcdaxea, Blainville, Man. 



cells are about the size above given ; 370. 



Esper states that 4 or 5 of the lamella Astrcea galaxea, Lesueur, Mem. du Mus. vi. 



are a little larger than the others. 285, pi. 16, fig. 13, Lesueur states that 



