96 VERRILL, SYNOPSIS OF 



POCILLIPORA PLTCATA Daiia. 



Pocillopora plicata (pars) Daaa, Zooph., p. 534, pi. 50, fig. 7, 7a to 

 7d. 



A comparison of the original specimens shows that the 

 typical form from the Feejees is quite different from the 

 Hawaiian specimen described above (P. aspera, var. 

 lata), although so similar in its branches and mode of 

 growth that, without a direct comparison, especially of the 

 cells, they would naturally be confounded, as was done 

 by Prof. Dana. In this species the coral is very porous, 

 and the cells are but little filled up below by solid matter, 

 so that the transverse plates are often distinct through the 

 whole length. The lateral cells are well separated, circu- 

 lar, rather large, stellate, having twelve unusually well 

 developed septa and a small columella. The coenen- 

 chynla between the cells is evenly covered with small 

 spinules, much less rough than in J*, aspera. The 

 verruca are also more appressed and less numerous. 



Feejee Islands. J. D. Dana. U. S. Expl. Expedi- 

 tion. 



This species may best be distinguished from P. aspera, 

 var. lata by the more di&tant cells, more highly developed 

 septa, the finer and more even granulation of the surface, 

 and the more porous texture. 



PociLLiPORA FRONDOSA Verrill, sp. nov. 



Corallum light and unusually porous, forming hemi- 

 spherical clumps, consisting of numerous elongated, irreg- 

 ular, often crooked, compressed, frond-like branches, 

 with expanded and variously lobed and plicate ends. 

 The branches are from .3 of an inch to 1.5 broad, and .3 

 to .5 thick, except at the summits, which are scarcely .25. 

 The verrucce are nearly obsolete, both upon the sides and 

 ends of the branches, being represented upon the lateral 

 surfaces only by distant and slightly elevated, irregular 

 prominences and low ridges, which are often wholly 

 wanting. Cells large and deep, rather crowded, the 

 spaces between seldom equal to half their diameter even 



