SUPPLEMENT. 699 



2. MYRIOZOUM GRACILIS. (Michelin.} Dana. 



M. albidum ; dichotome ramosum, ramis gracilibus, teretibus, suprh irre- 

 gulariter inflatis, apice rotunda to-truncatis. 



Whitish ; dichotomously ramose, branches slender, terete, above irre- 

 gularly inflated, round-truncate at apex. 



Mediterranean. Michelin. 



Michelin states that the branches are more slender than in the 

 truncata (hardly a line thick in the figure), and have more rounded 

 extremities, with the surface, where the cells are most numerous, 

 inflated. 



Myriapora gracilis, Michelin ; Guerin, Mag. de Zoo!., 1842, Zooph., pi. 4. 



GENUS PUSTULOPORA. BLAINVILLE. 



Affixes. Coralla calcarea, stratis seriatis instructa, cylindrica, autparce 

 ramosa; cellis sparsis, prominulis out pustuliformibus, apertura wbi- 

 culata. 



Attached. Coralla calcareous, consisting of a series of layers, cylin- 

 drical or sparingly ramose ; cells scattered, a little prominent or 

 pustuliform, aperture circular. 



This genus, as instituted by Blainville, appears to include species 

 imperfectly allied. The P. madreporacea (Ceriopora madreporacea, 

 of Goldfuss), appears to have some relation to the Myriozoum, and 

 not to present the stratified structure above stated. 



Blainville, Man., 418. Goldfuss, Petref., tab. 10. Lnmarck, 2d ed., ii. 314. 



