338 ZOOPHYTES. 



4. AGARICIA LEVICOLLIS. (Dana.) 



A. late explanata, paulo undulata, tennis (1J-3'"); collibus elongatis, 

 fere obsoletis, angustis (l-l'"). Corallum oririmis seriatis, incon- 

 spicuis ; super fide inferiore subtiliter striatuM. 



Broad explanate, a little undulate, thin (1J to 3 lines) ; ridges elongate, 

 nearly obsolete, narrow (1 to l lines). Corallum with the ori- 

 riraes seriate, indistinct ; under surface finely striate. 



Plate 22, fig. 2, part of corallum, natural size. 



East Indies. Exp. Exp. 



This species forms large thin fronds, with long narrow nearly obso- 

 lete ridges, very minute lamellae, about equal under a microscope, and 

 indistinct seriate oripores. A part of a frond in the Expedition col- 

 lections measures six inches by twelve in breadth, and the whole 

 when complete was probably not short of eighteen by twelve. 



5. AGARICIA PLANULATA. (Dana.} 



A. late explanata, subtus affixa, tennis (!'"); polypis scepe seriatis, 

 scepe sparsis. Corallum collibus inter stitialibus obsoletis, et scepe cum 

 cellis polygonis fere superjicialibus sparsis, 1-2'" latis ; superfcie 

 inferiore concentrice et radiate plicatuld, striis subtilissimis et paulo 

 diver gentibus. 



Broad explanate, attached by a point on the under surface; thin 

 lines); polyps either seriate or scattered. Corallum with obsolete 

 interstitial ridges, or with polygonal cells nearly superficial, and 1 

 to 2 lines broad; under surface concentrically and radiately faint 

 plicate, striae very fine and a little divergent. 



This species is closely allied to the Mycediae. The corallum is 

 remarkable for its numerous scattered oririmes at the centre of poly- 

 gonal cells nearly superficial, and for the obsolete ridges between the 

 seriate oririmes. The radiate plic;e of the under surface are nearly a 

 fourth of an inch wide, and give it a peculiar appearance; the striae, 



