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T H 



NAT 



RAL 



T O 



ARTICLE 



IV 



Of fuch as live infimple, roundifh, Jlony majfes of a porous texture ', compojed chiefly of i 

 great number of Jlender cylindric and radiated cavities, ranged clofe to each other 



nd running obliquely from the fur J 



bafe of the Jlruclure 



r 



STREA i. Aperturis cavernarum minimis, m, 



L The Star-ftone with fmall 



ASTREA 2. Aperturis cavernarum radiatis, ce 



iff a inaquali 





.. -*• 





fpongiofo 



The Star-ftor 



wit I 



i 



loofe fcongy center to the cell 



ASTREA 3. Aperturis cavernarum radiatis, centro folido. 



The Star-ftone with a folid center to the cells. 





- 



ASTREA 4. Deprefia inaqualis, aperturis cavernarum concavo-radiatis, 



t 



The Star-ftone, with a hollow center to the cells. 



ASTREA 5. Rugcfa, areolis majoribus fubrotundis laxe & irregulariter radiatis, 



\ 



■ 



All thefe fpecies of the Star-ftone are frequently caft up on the mores of J 



maica 



d 



y be eafily diftinguifhed by the difpoiition and form of the nucleus 



or center of the apertures of the 



but the lafi: fort feems to hold a main be 



this and the next genus, for it is of a more loofe open 

 gular in the difpoiition of the radiating lamina of its cells. 



and not fo 





ARTICLE 



V. 



Of fuch as live in fmple, roundifi, Jlony majfes of a loofe porous texture, com- 

 pofed of a feries of lamellate d irregular caverns whofe openings appear in an- 

 gular or oblong winding fpaces in the Jiirface, and whofe cavities arch obliquely 

 towards the center or bafe. 



YCEDIUM r. Deprejjum majus, gyris longifjimis contortis radiatis, lameU 



lis tenuiffimis denticulatis. 



The larger deprefled brain-ftone with long winding caverns. 



MYCEDIUM 2. Subrotundum, areolis oblongis radiatis irregularibus. 



The fmaller roundifh Brain-ftone with irregular oblong caverns 



MYCEDIUM 3. Comprejfum ajfurgens uk 



dulatum* areolis 



radiatis 



gularib 



th irregular oblon 



6 



The compreffed Brain-ftone w 



All thefe produ&ions are natives of the feas about Jamaica, and frequently found 

 upon the beech at Bull-bay and the Palifadoes. The three foregoing fpecies are very 

 diftinft from each other, for the rirft is commonly found in large fpreading roundifh 



"" '"' mding radiated areas j the fecond is feldom Co large, and generally 



and the laft is commonly 



ft 



wi 



th 



n 



appears in a fpherical form with roundifh radiated 



d porous than either, and 



areas at the marg 



The 



enerally found in comprefTed flakes, with the 

 many other diuincl appearances of this kind ob- 

 ferved about Jamaica', as the Mycedium depreffum tenuius & elegantius, areolis lon- 

 gis undulatis : Mycedium, areolis undulatofdlatis: Mycedium areolis Jubquadratis; 



&c. 



4 



n 



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