246 ZOOPHYTES. 



12 larger rays) with simple open cellules ; septa solid, nearly a 

 line thick : in a vertical section, cellules neatly equal, J a line 

 broad, and septa linear and solid. 



Plate 13, fig. 8. 



Wake's Island, Pacific Ocean. Exp. Exp. 



This species, of which I have seen only worn specimens, resembles 

 much the parvula in general appearance; but the cells are a little 

 larger, and the internal texture neater and more regular in its cel- 

 lules ; the septa are one half broader in a transverse section, and the 

 stars appear with less crowded rays. The masses break with a 

 straight grain, and almost columnar surface, while in the parvistella, 

 the texture is curved and irregular with more uneven cellules. Judg- 

 ing from the worn specimens, it may be inferred that the cells have a 

 general resemblance to those of the species just mentioned, though 

 somewhat larger and deeper. 



52. ASTR^EA INTERSEPTA. (Esper.) 



A. convexa, discis scepius gemmatis et dichastids. Corallum cellulosum, 

 robustum; cellis parvulis (vix 1'" latis), suborbicuhtis, subprofundis, 

 intus vix coronatis; collibus pkmis, inter dum duplicatis, lamellato- 

 scabris; lamellis paululum exsertis, et circum cellas radiatis, apice 

 truncatis,fragilibus, intus abruptis: transverse secto, stellis paucira- 

 diatis, cum cellulis simplicibus; septis J-J'" crassis, subcellulosis, cellu- 

 lis interrupte uniseriatis. 



Convex; disks often budding and dichastic. Corallum cellular, firm; 

 cells minute, nearly circular, less than a line broad, rather shallow, 

 scarcely coronate within ; ridges flat, sometimes duplicate, lamello- 

 scabrous; lamellae a little exsert and radiate around the cells upon 

 the septum, truncate at apex, fragile, abrupt within: in a trans- 

 verse section, stars few-rayed, with the cellules simple; septa | to 

 J of a line thick, subcellular, cellules interruptedly in a single 

 series. 



Plate 13, fig. 12, surface of corallum, natural size; 12 a, cells 

 enlarged; 126, lamella? and section of cell, natural size; 12 c, lamella? 

 enlarged; 12 d, transverse section, enlarged; 12 e, vertical section, 

 natural size. 



