REPORT ON THE REEF-CORALS. 113 
the dissepiments have been removed to lay bare the tabulz, and where one tabula has 
been partly removed to show the one above it. 
Locality. Wednesday Island, Torres Straits, 8 fathoms. 
Section MADREPORARIA FUNGIDA. 
Family PLEsIorUNGID. 
Genus 1. Siderastrea, Blainville. 
Siderastrea (pars), Blainville, Dict. d. Sci. Nat., lx. p. 335. 
Astrea, Milne-Edwards and Haime, Cor., ii. p. 505. 
Siderastrea, Duncan, Rey. Madrep., p. 134. 
Siderastrea galaxea (Ellis and Solander). 
Madrepora galaxea, Ellis and Solander, Zoophytes, p. 168, pl. xlvii. fig. 7. 
Astrea radians, Milne-Edwards and Haime, Cor., 1. p. 506. 
Following Pourtalés' I have adopted the specific name of Ellis and Solander instead 
of that of Pallas. Only a single specimen was obtained, and it forms an almost spherical, 
free mass, about 8 cm. in diameter. The species is very variable in the thickness and 
prominence of the primary and secondary septa. Excellent figures are given in the 
plates of the Report on the Florida Reefs.’ 
Locality. Bermuda. 
Genus 2. Tichoseris, Quelch. 
Tichoseris, Quelch, Ann. and Mag. Nat. Hist., vol. xiii., 1884, p. 295. 
Corallum compound, massive, columnar or lobate, with neither transverse calicinal 
ridges nor longitudinal crests, astreiform. Calicles with distinct, elevated walls, which 
are solid throughout, thin at their upper edges, but thick at the basal part of the calicles ; 
calicinal centres arranged sometimes singly within their own walls, but generally 
united in more or less irregularly sinuous groups of two or more centres, incompletely 
separated from one another, and surrounded by the common wall of the calicle from 
which they are developed. New calicles arise either by direct division of a single 
calicle forming two separate ones with distinctly raised walls, or by the upgrowth of 
synapticule at one or more parts of the calicle to form new walls, the resulting centres 
forming more or less meandrine series, until the final development of their own wall 
isolates them. Septa solid, entire, not confluent, those of adjoiming calicles quite 
separated by the elevated wall, but often directly opposite each other. Columella absent 
or forming deep down a small styliform projection at the point of coalescence of the 
1 Tllust. Cat. Mus. Comp. Zool., No. iv. p. 81. 2 Mem. Mus. Comp. Zodl., U.S.A., vol. vii. No. i. 
(ZOOL, CHALL. EXP.—PART XLVI.—1886.) Zz 15 
