522 ZOOPHYTES. 



branchlets rather obtuse at apex, 6 or 8- winged, cells slightly 

 vaulted. 



Red Sea. Ehrenberg. Singapore and Sooloo Sea. Exp. Exp. 



This is a more slender species than the subulata; the branches are 

 seldom stouter at base than above, and are obtuse at apex, and dis- 

 tinctly winged. The cells are mostly in eight series, and are but 

 slightly vaulted : a distinct columella may be seen within, but it is 

 short. It grows in hemispherical clumps six to twelve inches high, 

 consisting of crowded stems, neatly branched. v In the smaller clumps 

 the branches are seldom coalescent ; but when they have attained a 

 large size, the branches below are much united, even becoming lami- 

 nate in some degree. 



Seriatopora octojJtera, Ehrenberg, op. cit., Gen. Ixxiii., sp. 5. 



5. SERIATOPORA CALIENDRUM. (H. and Ehrenberg.} 



S. ramis basi bilinearibus, subtilius asperis, intricatis et coalescentibus, 

 ramulis tenuissimis, apice gracillime. subulatis. Corallum cellis non 

 fornicatis, ramulorum supremo apice hexapteris. 



Branches 2 lines thick at base, minutely asperate, intricate and coales- 

 cing; branchlets very slender, with finely subulate extremities. 

 Corallurn with the cells not vaulted; apex of the branchlets 6-winged. 



Red Sea. Ehrenberg. 



Ehrenberg observed specimens of this species two feet in breadth, 

 and six to eight inches in height. It is a rather fragile species. 



p. gracilis. The following are the characters of a large specimen 

 obtained in the Sooloo Sea, near the above in many particulars, yet 

 not agreeing wholly with the description. Branches and branchlets 

 very slender, scarcely over a line in thickness, often intricately coales- 

 cing, but not into a lamina ; above very slender subulate ; polyps in 

 four to six series. Corallum with the branches square, sometimes 

 hexagonal, not winged at apex ; cells minute (one-fifth of a line broad), 

 vaulted, short 6-rayed, with a slender, prominent columella. (Plate 

 49, fig. 4, part of corallum, natural size.) 



