244 A. FE. Verrill— The Bermuda Islands; Coral Reefs. 
The description of this species given by Pallas, in 1766, is very 
good and applies perfectly well to this species and to no other. 
Therefore there is no reason why his name, radians, should not be 
universally adopted, instead of yalaxea of much later date. 
The development of this species has recently been the subject of 
an extended work by Dr. Duerden. It proves to be hardy in con- 
finement and well adapted for such studies (Carnegie Inst., 1904, 
Publ. No. 20). Dr. Duerden there fully describes the adult and 
young polyps, as well as the gradual development of the corallum 
from its earliest appearance, with admirable illustrations. 
99a 99b 
» Arete DpH 1 a b 
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Whe” SP JY oR: 
Figure 99a.—Siderastrea radians; diagrammatic view of disk and tentacles, 
much enlarged. The tentacles and septa are numbered according to their 
cycles. 
Figure 99b.—The same; a, inner bilobed tentacle; 6, outer simple one. Both 
after Duerden. 
Siderastrza siderea (E. and Sol.) Blainy. Star Coral. Figures 100, 100a. 
Madrepora siderea Ellis and Sol., op. cit., p. 168, pl. xlix, fig. 2, 1786. 
Siderastreea siderea Blainy., op. cit., p. 835, 1830; Man. Actin., p. 370, 1854. 
Edw. and Haime, Monog., p. 141, 1849. Verrill (pars), these Trans., x, p. 
554, 1900; vol. xi, pp. 151, 181, pl. xxx, figs. 2, 3, 1901. Vaughan, op. cit., 
p. 809, pl. xiv, figs. 1, 2, pl. xvi, fig. 1, 1902. Duerden, Mem. Nat. Acad., 
viii, pp. 427, 488, 588-591, pls. xxiii, xxiv, figs. 150-160. 
This coral grows in the same forms as the last, but appears to be 
much less common at Bermuda, at least in the places that we visited. 
Figure 100a.—Siderastrea siderea, one-half of a calicle in section, but showing 
expanded polyp; from life; ce, c, septa; s, mouth and stomodeum. Drawn 
by the author, x about 8. 
It is more restricted to the outer reefs, where it may become large. 
