242 A. E. Verrill—The Bermuda Islands; Coral Reefs. 
The polyps, when fully expanded, rise considerably above the 
calicles. The column and tentacles are translucent and usually 
nearly colorless, specked with white. There are generally 12 nearly 
equal tentacles ; occasionally a large calicle occurs with 24 blunt 
tentacles and 24 septa. Such abnormally large calicles soon undergo 
fission. They are more frequent in P. astreoides and some other 
species. 
Vaughan unites the clavaria and all the other branching West 
Indian forms in one species, under the name Porites porites. There 
may be good reasons for doubting the correctness of this, but there 
is no reason to doubt that clavaria was one of the forms included 
under .W. porites by Pallas. 
Siderastrea radians (Pallas) Ver. Star Coral. Figs. 98-99b. Pl. xxix, fig. 2. 
Madrepora radians Pallas, Elench. Zoéph., p. 322, 1766. 
Siderastrea radians Verrill, Bull. Mus. Comp. Zoél., i, p. 55, 1864; these 
Trans., xi, p. 1538, 181, pl. xxx, fig. 1. Vaughan, Corals Porto Rican Waters, 
p. 809, pl. xy, pl. xvi, fig. 2, 1901. 
Duerden, Mem. Nat. Acad. Sci., viii, pp. 508, 520, 528. The Coral Sideras- 
trea radians and its Postlarval Development. Carnegie Inst., Washington, 
Publ. No. 20, 180 pp., 11 pl., 1904. - 
Siderastrea galaxea of many writers. Pourtalés, Reef Corals, p. 81; Florida 
Reefs, pl. xi, figs. 14-21, series of young; pl. xv, figs. 1-12, figs. 1-7 show 
living polyps. 
This is a very common coral, both on the reefs and on the flats in 
shallow water near the shore, and in Harrington Sound. We found 
Figure 98.—Siderastrea radians with the polyps partially expanded, much 
enlarged. Altered from Agassiz. Phot. from a colored drawing, hence too 
dark. 
