331 [Verrill. 



inch. The basal mural expansion is very thin, compact, and slightly 

 granulated, having a smooth appearance, and usually without apparent 

 striations. Septa from thirty to forty, very narrow, with the inner 

 edges perpendicular, forming a deep cup, broad at the bottom ; they 

 are all of nearly the same width, except those of the last cycle, 

 which are more narrow, giving an even appearance to the cavity 

 of the cup ; they project slightly above the walls, about .02 inch, in 

 the form of sharp points, alternately larger and smaller ; inner edges 

 are thin, evenly and sharply dentate, the sides strongly granulated, and 

 not crowded together, the spaces between being about equal to their 

 thickness. The columella consists of numerous even papillre, passing 

 into the teeth at the base of the septa. Walls exteriorly with even, 

 thick costae on the upper part, mostly disappearing towards the base. 



Diameter of cup .1 to .12 of an inch; depth .06 to .09 ; height of 

 corallites usually about .08, sometimes .15. 



Panama on reef, common. F. H. Bradley. 



Astrangia pulchella sp. nov. 



Corallum consisting of large patches of small, low, cylindrical 

 corallites, scattered at distances, varying from less than their diame- 

 ter to more than a quarter inch, and connected together by a thin 

 calcareous, basal expansion, much as in the preceding species, but 

 smoother and with only minute granulations. Cups shallow, 

 conical, with a narrow centre, their whole inner surface crowdedly 

 papillose, the columella being confused with the teeth of the septa, 

 and very small. Septa twenty-four, projecting very slightly above 

 the wall, narrow at the top, but broad within, all nearly equal, the 

 edges evenly toothed, and the sides strongly granulated, so that the 

 granules of adjacent septa often touch, giving them a crowded appear- 

 ance. Cost* scarcely apparent, even at the border. Diameter of 

 the cups .08 to .1 of an inch ; depth .03 ; height .05, sometimes 

 more. 



Panama, with the last, common. F. H. Bradley. 



Astrangia concinna sp. nov. 



Corallum consisting of clusters of broad, low, cylindrical corallites 

 connected by a thin basal expansion, and distant about their own 

 diameters. Cups not so deep as wide, subconical, with a narrow 

 papillose columella forming the bottom. Septa from thirty-six to 

 fifty, subequal, the primaries often a little broader, and those of the 

 last cycle narrower than the rest. All are rounded at the top, and 

 finely toothed, but at the middle the inner edge becomes more nearly 

 perpendicular, and has longer teeth resembling pali, which blend 



