52 S Verrill, N'otes on Radlata. 



Astrangia concinna Verriii, op. dt., p. 331. 



Plate IX, figure 5. 



The coralla consist of clusters of broad, low, cylindrical corallites, 

 which are distant about their own diameter and connected by stolons 

 or a thin basal expansion. Calicles not so deep as wide, cup-shaped, 

 with a nai-row 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 with tlie papillae of the columella, which are fine and numerous. 

 The tops of the septa are thin and project slightly above the wall, the 

 primaries most so. Their sides are not so strongly granulated as in 

 the preceding species, and they appear thinner and less crowded. 

 Exterior granulated, slightly costate near the summit, often encrusted 

 with Bryozoa, etc., to near the top. 



Diameter of cups "IS to -22 ; height '10 to 'IS of an inch. 



Panama and Pearl Islands, not common,— F. H. Bradley. 



Resembles the last, but has much larger cells and more numerous 

 septa, which are not so strongly granulated. 



Astrangia dentata Veniii, op. cit, p. 332. 



Coralla forming clusters, encrusting rocks, similar to the last, with 

 cups of about the same size, but deeper and less open. Septa from 

 thirty-six to forty-eight, very unequal according to their cycles, the 

 primaries being comparatively broad and rounded above, while those 

 of the last cycles are very narrow ; they are not crowded, being sepa- 

 rated by spaces equal to their thickness ; they project unequally, 

 the primaries about 02 of an inch, the others slightly. All the septa 

 are strongly and irregularly toothed, the principal ones especially so ; 

 the teeth on the upper part are rough and lacerate, those on the inner 

 part prominent, paliform, merging into those of the columella ; the 

 sides are rudely granulous. Columella rather small, concave, forming 

 the narrow bottom of the deep cells, covered by numerous, small, 

 crowded, rough papillie. 



Walls thin, with subequal, low, thick, granulous costa?, Avhich often 

 extend on the surface of the basal expansion, and usually encrusted 

 nearly to the edge of the cups with sponge, etc. Color of the un- 

 bleached coral dark brown. 



Height of corallites -20 to -.'lO ; diameter -15 to -20 ; depth about -05; 

 some of the patches are two or three inches across. 



