TRIBE I. ASTR^ACEA. 333 



Erect cylindrical, 1 to 3 inches in diameter, sometimes a little com- 

 pressed, rounded at apex, occasionally lobato-furcate ; tentacles ob- 

 solete, bright green. Corallum with the oririmes 1 to 1| lines 

 distant, and smaller at apex ; lamellae entire. 



Plate 24, fig. 4, corallum, natural size ; 4 a, animal, enlarged ; 4 b, 

 star of corallum, magnified. 



i 



Feejee Islands. Exp. Exp. 



This species grows in stout cylinders, attaining a height of six 

 inches or more, and covering crowdedly areas of considerable extent. 

 It resembles the siderea, but the stars are much smaller and its mode 

 of growth quite different. The animals are similar in every respect 

 to those of the Pavonise. 



GENUS VIII. AGARICI A. LAMARCK. 



Fungidce affixce, oblique ml recte explanatce, unifrontes aut bifrontes ; 

 polypis transverse seriatis, latere externo valde turgido ; interdum sub- 

 seriatis et circum ora omnino elevatis ; itaque oribus, in imis fossis 

 transversis aut cellis, dispositis. Corolla scepius collibus transversis 

 rugata, interdum reticulata ; lamellis minutis, subintegris confertissi- 

 mis, minoribus alternis. 



Attached Fungidse, oblique or erect explanate, unifacial or bifacial ; 

 polyps transversely seriate with the outer side prominent; sometimes 

 subseriate with the parts around each mouth elevated ; hence the 

 mouths are arranged either at the bottom of transverse fossae or 

 of cells. Coralla transversely or reticulately colliculate ; lamellae 

 minute, subentire, crowded, alternately smaller. 



The genus Agaricia connects on the one side with the Pavoniae, and 

 on the other with the Astraeae, and includes properly two groups, 

 which, however, are connected by gradual transitions. In one, the 

 folia are unifacial, and grow against the sides of a reef-rock, like the 



84 



