TRIBE I. ASTRjEACEA. 337 



subpalmate, margin strongly reflexed ; ridges large, often inter- 

 rupted and very unequal, 2 to 3 lines thick at base, with the sum- 

 mits often much prolonged ; polyps reddish-brown, tentacles ob- 

 solete. 



Plate 22, fig. 1, part of corallum, natural size ; 1 a, the animals 

 enlarged ; 1 b, longitudinal cross-section, enlarged; 1 c, transverse, do. 



" Austral Seas." Peron 4* Lesueur. Feejee Islands. Exp. Exp. 



This species forms large plates, half an inch thick, attached by one 

 edge to the side of a vertical rock, in one to three fathoms water ; the 

 upper margin is often deeply lobed, the lobes being two to three inches 

 long and wide. It differs from the preceding, in its stout reflexed 

 margin, and very uneven ridges, which have the summit much pro- 

 jecting, or in peaks, in many parts. The oririmes are numerous along 

 the bottom of the furrow, and others are occasionally seen on the sur- 

 faces of the larger ridges. 



Agaricia rugosa, Lamk., ii. 381, No. 3. Agaricia rugosa, Blainville, Man. 361. 



3. AGARICIA SPECIOSA. (Dana.) 



A. cucuttato-explanata, subreniformis, tennis, et margine non reflexa; 

 cottibus prominentibus, angustis (1-1J'"), subtriangulatis, sub&qua- 

 libus. Corallum margine fragile, superfaie inferiore subtiliter 

 striatum. 



Cucullato-explanate ; subreniform, thin, margin riot reflexed ; ridges 

 prominent, narrow (1 to 1J lines), subtriangular, nearly even. Co- 

 rallum with the margin fragile, and under surface very finely striate. 



Plate 21, fig. 7, corallum, natural size. 



East Indies. Exp. Exp. 



This is a neat species with even prominent narrow ridges, and the 

 frond very thin for two inches from the margin. The lamellse of the 

 corallum are extremely minute, rendering the surface very delicately 

 striate. The only specimen seen is nearly reniform in shape, and 

 measures six inches by four in breadth, with the greatest thickness 

 hardly a fourth of an inch. 



85 



