S3 



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. Pav. 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. — holetiformis. . . . Mad. Cristata. Sol. & Ellis, Tab. xxxi. fig. 3, 4. 



5. — divaricata. . . . Indian Seas. 



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



7. — ohtusangla. . . . 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. cucuUafa. . . . 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. — papulosa. . . . South Sea. 



6. — lima. . . . South Sea. 



7. — explanidata. . . . Mad. pileus. Esper. i. Tab. vi. 



No fossil specimens have been described. 



