92 MADREPORARIA. 
corallites are longer, quite unequal in length, and more spreading, so as to give the branchlets 
an apparent greater diameter. They differ from Dana’s description in one or two points. 
The prominent radial corallites are all compressed, 3 to 5 mm, long and 1°5 mm. thick, but 
a few are longer, thicker, and bear a few small buds; the form is usually narrow boat-shaped 
or tubo-labellate ; the outer part of the wall is always thicker than the inner, and in the 
stouter ones is considerably thickened, the aperture being oblique and slit-like. Between the 
prominent corallites short or subimmersed ones occur to near the apex of the branchlets ; 
in the basal parts all become short, appressed, tubular, with a moderately thick wall and 
rounded margin, with immersed cells interspersed. Corallum porous, finely reticulate in section ; 
surface striato-reticulate or spongy in parts; wall firm, with the appearance of porcelain, very 
finely striato-reticulate. Axial corallites cylindrical, 2 mm. diameter, 1 to 2 mm. exsert, wall 
a little thickened; the star consists of 6 subequal septa, with sometimes indications of a 
second cycle. In the prominent radial corallites usually only the two directive septa are 
prominent, but nearer the base the star is better developed and sometimes a rudimentary 
second cycle of septa may be distinguished. 
Indo-Pacific Ocean : Mauritius, Seychelles, East Indies, Sulu Sea, Singapore, Amboina, 
Ternate, Ponapé, Samoa, Great-Barrier Reef, Fiji, Tongatabu. 
a. Wreck Bay, Great-Barrier Reef. J. B. Jukes, Esq. [P.]. 46. 7. 30. 1. 
6. Wreck Bay, Great-Barrier Reef. J.B. Jukes, Esq. [P.]. 46. 7.30.6. (Young in- 
crusting colony.) 
c. Port Denison. Saville-Kent Coll. 92. 6. 8. 197. 
d. Low Woody Island. Saville-Kent Coll. 92. 6. 8. 198. 
e. Rocky Island. Saville-Kent Coll. 92. 6. 8. 302. 
fg. Mauritius. Purchased. 78. 2. 4.1 & 4. 
a. Ternate. H.M.S.. ‘Challenger.’ 85.2.1.3. (=WM. secale, 
Quelch.) 
i. Amboina. H.M.S. ‘Challenger’ 85.2.1.1. (=M. cereals, 
Quelch.) 
j. Seychelles. HEMESeAlert-4 1825105758: 
k. Tongatabu. dp do Inge EC, R, Sil, ok ws Os 
1. Singapore. G. B. Sowerby, Esq. [P.j. 39. 6. 28. 1. 
m. ? Purchased. 44. 6. 10. 4. 
C. Corallum vasiform or plate-like, with very numerous short branchlets on the upper surface. 
Under surface without branchlets or with a few which are short and oblique. 
a. Radial corallites chiefly labellate and thin-walled. 
84, Madrepora spicifera. 
Heteropora microclados, Ehrenberg, Corallenth. d. roth. Meeres, p. 109 (part.). 
Madrepora spicifera, Dana, Zoophytes, p. 442, pl. xxxiii. figs. 4 & 5, pl. xxxi. fig. 6; M.-Edwards & 
Haime, Coralliaires, t. iii. p. 157; Verrill, Bull. Mus. Comp. Zool. 1864, vol. i. p. 42; Studer, 
MB. Akad. Wiss. Berlin, 1878, p. 525; Studer, Mitth. naturf. Ges. Bern, 1880, p. 19; Duncan, 
Journ. Linn. Soe. Lond. 1886, vol. xxi. p. 20; Rathbun, Proc. U.S. Nat. Mus. 1887, vol. x. 
p- 18; Faurot, Arch. Zool. Expér. 1888, t. vi. p. 119; ? Ortmann, Zool. JB. 1888, Bd. iii, p, 153 ; 
? ibid. 1889, Bd. iv. p. 511; B.-Smith, Ann, Mag. N. H. 1890, vol. vi. p. 454. 
