INTRODUCTORY NOTICE. 9 
polygonal when crowded, externally slightly costate; calices infundibular ; col- 
umlella slightly developed; partitions up to thirty-five in number, slightly 
exserted, narrow, with their margin oblique and serrated and their sides denticu- 
lated; polypes cylindrical, projecting up to half an inch in length, translucent 
white, brown, red, or green; tentaculee colorless, twenty-four in number, elon- 
_ gated conical, with rounded tips, situated in an alternating circle; mouth oval, 
situated at the summit of a conical proboscis; coral masses up to two inches in 
diameter.” 
