118 MADEEPOEAEIA. 



3 mm. diameter, not over 2 mm. long, and usually less. The aperture is very wide and the 

 septa very prominent. Wall closely striate. 



Indo-Pacific Ocean : Ceylon^ Singapore^ Great-Barrier Reef area. 



Saville-Kent Coll. 92. 6. 8. 165 to 1 78 & 186. 



Saville-Kent Coll. 92. 6. 8. ] 79. 



Saville-Kent Coll. 92. 6. 8. 180. 



Saville-Kent Coll. 92. 6. 8. 181, 183 & 184. 



Saville-Kent Coll. 92. 6. 8. 182. 



Saville-Kent Coll. 92. 6. 8. 266. 



Saville-Kent Coll. 92. 6. 8. 267. 



Saville-Kent Coll. 92. 6. 8. 268. 



Haeckel Coll. 92. 12. 5. 30. 



Saville-Kent Coll. 92. 6. 8. 128 to 134. 

 Saville-Kent Coll. 92. 6. 8. 185. 

 Saville-Kent Coll. 92. 6. 8. 190 to 192 & 263. 



115. Madrepora convexa. 



Madrcpora convexa, Dana, Zoophytes, p. 449 ; M.-Edwards & Haime, Coralliaires, t. iii. p. 158 ; Verrill, 

 Bull. Mus. Comp. Zool. 1864, vol. i. p. 42; Studer, MB. Mitth. naturf. Ges. Bern, 1880, p. 20 ; 

 Eathbun, Proc. U.S. Nat. Mus. 1887, vol. x. p. 15 ; Ortmann, Zool. JB. 1888, Bd. iii. p. 153 ; 

 ibid. 1889, Bd. iv. p. 508 (part.). 



? Madrepora corymhosa, Verrill {non Dana), Bull. Mus. Comp. Zool. 1864, vol. i. p. 42. 



Corallum low corymbose, upper surface flattened or convex, 25 cm. or more in diameter. 

 Main branches nearly horizontal, complanate below, reticulato-coalescent, with a few short, 

 naked and subangular branchlets in the general plane. Corallites on the under surface all 

 immersed or subimmersed excepting at the margin of the colony, or in some specimens with 

 a few scattered, thick, bursiform or appressed tubular ones. Branchlets on the upper surface 

 simple or subsimple and terete near the centre of the colony, more divided or 2)roliferous near 

 the margin, 5 to 7 mm. thick and 2*5 to 6 cm. long, varying in different specimens, mostly 

 tapering, apex not very obtuse. Axial corallites short, cylindrical, 1 to 2 mm. thick and 

 1 mm. exsert, wall very porous and a little thickened. Radial corallites equal, scale-like or 

 labellate, crowded, and spreading almost at right angles, with a broad or rather narrow flat- 

 tened fragile lip, 1'5 mm. long and 1 to 2 mm. broad. Septa in two cycles, both well 

 developed in the axial corallites ; in the radial ones the second cycle is rudimentary but 

 rarely absent. Coenenchyma very porous ; wall delicate, striato-echinulate. 



A cespitose specimen 18 cm. in diameter, from Tongatabu, diff'ers only in habit and in 

 the more proliferous branchlets and slightly unequal corallites. 



This species is distinguished from M. millepora by the shorter, more simple, and tapering 



