516 ZOOPHYTES. 



Branches J to J an inch thick, rarely | of an inch, obsoletely com- 

 pressed, often a little tumid at intervals. 



Red Sea and East Indies. Sooloo Sea. Exp. Exp. 



Forms hemispherical clumps, six or eight inches in diameter, neatly 

 branched; the branchlets are about half an inch apart, one-fourth to 

 one-half an inch broad at top, and rarely one and a half inches long. 



The following may be a variety of this species, yet it seems doubtful. 



/3. coakscens. Branches often nodose, a little compressed, frequently 

 anastomosing, one-fourth to three-fourths of an inch thick, cells much 

 vaulted, columella prominent, star sex-dentate. One specimen from 

 the Feejees (plate 49, fig. 2), is eight inches high, with the branches 

 coalescing every half inch to two inches. Another, a worn specimen 

 from the Sooloo Sea, has smaller branches, but is otherwise similar. 



Milleporaakicornis,Forska\.Anim. Egypt., Aniliopliora cucuUata, Gray, Zool. Trans., 



137. 1835, p. 85. 



Madrepom digitata, Pallas, Zooph., 326. Alveopora viridis (?), Quoy and Gaymard, 



, Ellis and Solander, No. 74. Voy. de 1'Ast., iv. 240, pi. 20, figs. 1-4 ; 



Savigny, Egypt. Polyp, pi. 4, fig. 3 ; an ex- this species, imperfectly described, has, in 



cellent figure. the figure, the cells of a Sideropora, and 



Forties scabra, Lamk., ii. 436, No. 6. the general form of the above species ; 



, Deslongchamps, Encyc., 652. but it may be distinct. It is from Port 



PocilloporaAndreossyi,A.udoum,Exp\ic.des Carteret, New Ireland. The branches 



planches de M. Savigny. are one-third to half an inch thick, and 



iSicfcroporasca&ra,Blainville,Man.,384,and somewhat compressed; the cells are deep 



Porites scabra, 396. with crenulate margins, and thin fenes- 



M. Porites digitata, Ehrenb., G. Ixx., sp. 7. trate parietes; the polyps have green tips. 



2. SIDEROPORA ELONGATA. (Lamarck.} Blainville. 



S. ramulis ekngatis, cylindricis. Corattum cellis sex-dentatis, margine 

 superiors prominulo. 



Branchlets elongate, cylindrical. Corallum with the cells sex-dentate; 

 superior margin a little prominent. 



The Indian Ocean? Lamarck. 



Lamarck says that this species differs from the preceding in its 

 general appearance and scarcely prominent cells. 



