52 THE ATLANTIC. [chap. i. 



very markedly distinguished from one another, and from the 

 primary and secondary septa. The septa of the fourth cycle 

 join those of the third a short distance before reaching the 

 columella. The septa of the fifth cycle are incomplete. The 

 margin of the calicle is very deepl}'^ indented, the costse corre- 

 sponding to the primary and secondary septa being prolonged, 

 in conjunction with the outer margins of these septa, into prom- 

 inent pointed processes ; similar but shorter prolongations ac- 

 company the tertiary, and some of the quaternary septa. Be- 

 tween each of the sharp projections thus formed, the edge of 

 the wall of the calicle presents a curved indentation. 



Two of the specimens procured expanded their soft parts 

 when placed in sea-water. The inner margin of the disk round 

 the elongated oral aperture presents a regular series of denta- 

 tions corresponding with the septa, and is of a dark madder 

 color; the remainder of the disk is pale pink. The tentacles 

 take origin directly from the septa. They are elongated and 

 conical. Those of the primary and secondary septa are equal 

 in dimensions, and, along with the tertiary tentacles, which are 

 somewhat shorter, but in the same line, ai*e placed nearest the 

 mouth, and at an equal distance from it. The tentacles of the 

 fourth and fifth cycles are successively smaller and at succes- 

 sively greater distances from the mouth. Placed on either side 

 of each tentacle of the fifth cycle, and again somewhat nearer 

 the edge of the calicle, there are a pair of very small tentacles, 

 which have no septa developed in correspondence with them. 

 There are thus four successive rows of tentacles, and the nor- 

 mal number is ninety -six. The tentacles are of a light -red 

 color, and between their bases are stripes of yellowish red and 

 light gray. 



This form belongs to the group Flahella subpedicellata of 

 Milne-Edwards, and probably to that division in which the costae 

 are prominent and ridge-like on the faces of the corallum, as 

 well as on its lateral margins; but it differs from those de- 



