248 ZOOPHYTES. 



Astrcea ahdita, Lamarck, ii. 415, No. 22. , Ehrenberg, G. Ix. sp. 12. 



, Lamouroux, Exp. Meth., 59, tab. 50, The A. ahdita of Quoy and Gaymard (Voy. 



fig. 2; Encyc., 128. de 1'Ast. iv. 205, pi. 16, figs. 4, 5), is 

 , Blainville, Man. 373. different species, near the dipsacea. 



54. ASTR.EA TESSERIFERA. (H. 4- Ehrenberg.} 



A. glomerata et lobato-ramosa, polygonata ; fusca. Corallum ceUulosum ; 

 ceUis angulatis, 5-6'" latis, paulo profundis, patulis, intus non coro- 

 natis ; collibus subcrassis et triangulatis, apice tenuibus et scepe pellu- 

 cidis ; lamellis valde denliculatis : transverse secto, stellis multiradi- 

 atis, septisfere solidis. 



Glomerate, erect, lobed and polygonal ; fuscous. Corallum cellular, 

 rather light ; cells angular, 5-6 lines broad, shallow, patulous, not 

 coronate within ; ridges rather stout and triangular, apical thin 

 and often pellucid ; lamellae strongly denticulate : in a transverse 

 section, stars multiradiate, septa nearly solid. 



Plate 13, fig. 9 a, b, c, sections of cells, natural size, showing pro- 

 file of lamellae; 9 d, transverse section of corallum, natural size. 



Red Sea. (Ehrenberg.} 



This species resembles in habit, the abdita, but the edges are less 

 thin and more obtuse. The cells are not subdivided in the middle by 

 the dichastic process ; on the contrary, it is usually a small part from 

 the upper side which is separated. 



The edges at the upper extremity of the ascending lobes, are some- 

 times much prolonged and translucent. 



Astrcea tesserifera, Ehrenberg, G. Ix. sp. lide dentatis." Ehrenberg refers with a 

 11 ; "stellis angulatis, patulis, semipol- query to Esper's fig. 2, tab. xlv. 

 licaribus, margine rotundatis, lamellis va- 



55. ASTHMA ROBUSTA. (Dana.} 



A. lobato-glomerata et polygonata, tesseriferse affinis. Corallum robus- 

 tum, subcellulosum ; cellis 46'" latis, angulatis, paulo profundis, 

 patulis, intus breviter coronatis ; collibus triangulatis ; lamellis angus- 



