68 MADEEPOKAEIA. 



50. Madrepora stigmataria. 



Madrepora stigmataria, M.-Edwarde & Haime, Coralliaires, t. iii. p. 145. 



? Madrepora repent, Eehberg, Abh. nat. Ver. Hamburg, 1892, Bd. xii. p. 36, pi. iv. fig. 8, 



Corallum extending subhorizontally from a rounded base in the form of a flattened 

 vasiform fan^ with frequent fusions. Main branches lax, with large spaces between, 1'7 cm. 

 diameter near the base. Subdivisions lateral, almost in one plane and becoming gradually- 

 attenuated. Ultimate divisions 1 to 3 cm. long, fused at the margin. Axial corallites 

 2'5 mm. diameter, scarcely exsert ; star of 6 subequal septa of moderate breadth, with some- 

 times a rudimentary second cycle. Radial corallites appressed nariform, with rather thick 

 wall, variable in size, at most I 75 mm. long and 2 mm. broad, but the majority are sub- 

 immersed ; star rudimentary, only the directive septa are recognizable. Corallum dense ; 

 surface finely granular throughout; the "granulations" consist of small spines with blunt or 

 irregular apices. 



The above description is based on the type in the Paris Museum. 



Indian Ocean : Seychelles. 



51. Madrepora subtilis. 



Madrepora subtilis, Klunzinger, KoraUenth. d. roth. Meeres, p. 28, pi. ii. fig. 7, pi. iv. fig. 4, pi. ix. 

 fig. 22. 



Corallum arborescent, laxly subdivided ; the branches chiefly in one plane, with frequent 

 fusions. Branches and branchlets slender and elongate, the stoutest not over 8 to 12 mm. 

 diameter; ultimate divisions 1 to 4 cm. long and only 4 to 5 mm. thick at the base, gradually 

 tapering. Axial corallites 2 to 3 mm. broad, 3 to 5 mm. long. Radial corallites mostly short 

 and small, 2 to 4 mm. long and 1 to 2 mm. broad, very distant, spreading, nariform, and 

 round labellate. Scattered between are a number of tubular corallites 4 to 5 mm. long and 

 2 mm. broad ; aperture small, round or oblique ; the larger ones bear one or more lateral bud- 

 corallites. Corallites distant and shorter on the underside of the corallum, more appressed, 

 rarely immersed. Star little prominent. Corallum very porous ; surface ribbed, trabecular, 

 with rows of broad flattened echinulations. 



A specimen from the Solomon Islands appears to difl'er only in the absence of fusions 

 and the less complanate branching. 



Indo-Pacific Ocean : Red Sea, Solomon Islands. 

 a. Solomon Islands. H.M.S. ' Herald.' 55. 12. 7. 150. 



52. Madrepora reticulata. (Plate IV. figs. A, B.) 



Madrepora reticulata. Brook, Ann. Mag. N. H. 1892, vol. x. p. 461. 



Corallum complanate and reticulate; largest specimen 36 cm. long and 20 cm. broad. 

 Branches rarely over 7 mm. diameter, forming a network with elongate meshes, wliich are 



