346 ZOOPHYTES. 



Pavomaobtusatigula, Lamk.,ii. 379, No. 7. caris, erecta, lobata, lobis rotundatis, 



, Deslongchamps, Encyc. 605. planis, collibus prominulis nutlis, stellis 



, Blainville, Man. 365. minimis, j'" latis, planis, vix impressis, 



The Pavonia obtusangula of Ehrenberg, in series subconcentricas dispositis, la- 



(op. cit. Gen. Ixv. sp. 4,) is thus de- mellis subtilissimis, venoso-filiformibus." 



scribed by this author, who queries whe- The locality is not known, 

 ther it be Lamarck's species : " Bipolli- 



2. PSAMMOCORA PLiCATA. (Dana.) 



P. cespitosa, plano-convexa, crebro ramosa, ramis J-f " latis, flexuosis 

 et flexuoso-plicatis, scepe coa/itis, undique obtusis ; polypis umbrinis, 

 tentaculis obsoktis, albido-virescentibus. Corallum oririmis minutis- 

 simis, vix conspicuis, in series longitudinales scepe dispositis, stellis 

 vix dispiciendis, non impressis. 



Cespitose, plano-convex, crowdedly ramose, branches \ to f of an inch 

 broad, flexuous and flexuoso-plicate, often coalescing below, obtuse '; 

 polyps umber-colour, tentacles obsolete, greenish-white. Corallum 

 with very minute oririmes, scarcely visible, often arranged in lon- 

 gitudinal series ; stars hardly distinguishable, not at all depressed. 



Plate 25, fig. 2, corallum, natural size ; 2 a, animals enlarged ; 2 b, 

 surface enlarged. 



Feejee Islands. Exp. Exp. 



The dense tufts which this species forms, are often ten inches or a 

 foot across, and somewhat convex above. The branches are much 

 plicate, as in the last, but the surface is smooth, without any appear- 

 ance of a depression about the very minute and hardly distinguishable 

 oririmes. The longitudinal series of oririmes are one to one and a 

 half lines apart, and the oririmes of the same series about half a line. 

 This species resembles the Porites plicata, but the plications are 

 neater, and the cells have not six points about the centre, as charac- 

 terizes the Porites. 



Lamarck's Pavonia plicata (ii. 378, No. 6) may be identical with the above ; but he 

 refers to Esper's tab. 66 (Fortsetz. i.), which represents the Porites plicata, or an allied 

 species. 



