83 



Pavonia. A stony polypifer, fixed and frondescent ; the 

 lobes flat, subfoliaceous, erect or ascending, with stelliferous 

 rugae or grooves on each side. 



The stars lamellated, in rows, sessile, and rather im- 

 perfect. 



None of the species of this genus have been found fossil. 



1. Par. agaricites Mad. agaricites. Lin. Sol. & Ell. Tab. Ixiii. 



2. cristata. . . . Knorr. Delic. Tab. A. X. fig. 1. 



3. lactuca Sol. and Ellis, Table xliv. 



4. _ boletiformis Mad. Cristata. Sol. & Ellis, Tab. xxxi. fig. 3, 4. 



5. divaricata. . . . Indian Seas. 



6. plicata. . . . Esper. Supp. i. Tab. Ixvi. 



7. obtusangla. . . . Indian Seas. 



8. frondifera South Sea. 



Agaricia. A stony polypifer, fixed, with flat, subfoli- 

 aceous expansions, the upper surfaces only having stel- 

 liferous grooves. 



The stars lamellous, sessile, and in rows, most frequently 

 imperfect, and hardly distinct. 



The pavoniae and the agaricae agree in some respects ; the 

 stars are disposed in grooves or on rugae in lines which give 

 the first idea of the meandrinae. But in the pavoniae, both 

 surfaces of the foliaceous expansion are constantly furnished 

 with stelliferous wrinkles or grooves, whilst in the agaricae 

 only one surface is thus furnished ; and although, from the 

 folding of the expansions, contradictory appearances may be 

 seen, the correctness of this observation will be ascertained 

 by minute inspection. 



1. Ag. cucullata Mad. Sol. and Ellis, Tab. xlii. 



2. undata Mad. Sol. and Ellis, Tab. xl. 



3. ampliata Mad. Sol. and Ellis, Tab. xli. fig. 2. 



4. rugosa. . . . South Sea. 



5. papillosa. . . . South Sea. 



6. lima South Sea. 



7. explanulata. . . . Mad. pileus. Esper. i. Tab. vi. 



No fossil specimens have been described. 



