Verrill, Notes on Rad'uita. 529 



Panama and Pearl Islands, at low-water mark in rocky pools, and 

 in 6 to 8 fathoms on base of 3Iuricea, — F. 11. Bradley ; Acajutla, San 

 Salvador, — F, II, Bradley ; Acapulco,--A. Agassiz ; La Paz, — J. 

 Pedersen. 



This species resembles the preceding more than any other species, 

 but may easily be distinguished by the deeper calicles and more un- 

 equal se})ta, which are more strongly toothed. 



Astrangia costata Vciriii op. cit., p. 332. 



Coralla consisting of from one to four, turbinate, rather high cor- 

 allites, surrounded by a very thin mural expansion, usually encrusting 

 dead shells. Cup circular, narrow and deep. Septa twenty-four to 

 thirty, the primaries wide, about one-fcurth the diameter of cup, 

 rounded and subentire at the top, per})endicular and toothed within ; 

 the others similar, but successively narrower, Avith sharp teeth through- 

 out. The septa project very unequally, giving a notched appearance 

 to the margin of the cups. Walls very thin, with subequal, elevated 

 costse, which extend to the base and on the basal expansion. The 

 columella is very small, with few papilla?. The septa within the cell are 

 thin and not crowded, the spaces between them being greater than 

 their thickness, giving them a loose appearance. Diameter of the 

 cups '08 to '10 of an inch; height '10 to "15. 



Panama, on dead shells, in 6 to 8 fathoms, — F. H. Bradley. 



This is very distinct from all the others and approaches Phyllangia. 



Astrangia Pedersenii Veiriii, sp. nov. 



Coralla composed of clusters of sub-turbinate corallites, connected 

 by thin stolon-like extensions, often arranged in linear series radiating 

 from the center of the cluster, the outer ones oblique. Corallites not 

 crowded, the largest seldom more than a quarter of an inch high. 

 Calicles cup-shaped, narrow and deep at center, with a thin edge and 

 quite open interseptal spaces, which are about twice as broad as tlie 

 septa. Columella very narrow, papillose. Septa thin, unequal, about 

 3(5 in the largest calicles; the primaries are about twice as udde as 

 the tertiaries, thin, a little exsert, the summit rounded and sharply 

 denticulate, the inner edge nearly perpendicular, Avith small, prominent, 

 paliform teeth tOAvard the base ; secondaries similar but a little nar- 

 roAver and less exert; those of the third and fourth cycles very thin 

 and narrow, very slightly exsert, the edge sloping from the narrow 

 summit and sharj)ly denticulate. Walls covered with about 36, Ioaa', 

 nearly equal, rather distant, granulous costre, often encrusted with 

 nullipore, etc. 



