80 MADEEPOKARIA. 



species. They consist of marginal fragments of a colony of M, tubigera, as was suspected 

 by Quelch himself. The elongate tubular corallites are here more numerous aud there is an 

 absence of the thicker tapering brauchlets frequent in the larger specimens. The species of 

 which Fowler gives an account of the structure under the name M. durvillei, Ed. & H.j is 

 the same as that recorded as M. capillaris by Quelch. 



The Coralhaven specimen has a number of the lateral corallites elongate and tubular, 

 with a round or oblique aperture. 



Singapore, Banda, Louisiade Archipelago. 



a,b. Banda. H.M.S. 'Challenger.' 86. 12. 9. 273 & 241. 



?c. Banda. H.M.S. 'Challenger.' 86.12.9.240. { = M. 



capillaris, Quelch.) 

 d. Coralhaven, Louisiade Archipelago. J. Macgillivray, Esq. [P.]. 51. 9. 29. 40. 



67. Uadrepora capillaris. 



Madrepora capillaris, Klunzinger, Korallenth. d. roth. Meeres, Th. ii. p. 29, pi. iii. fig. 4, pi. iv. fig. 13, 

 pi. ix. fig. 23 {non Quelch, ' Challenger ' Eeef-Corals, p. 161). 



Corallum arborescent} stem 20 cm. long, 15 to 20 mm. thick. Main branches clothed 

 with very numerous, spreading, very slender, elongate, often divided, tubular brauchlets, 

 which are scarcely thicker near the base of the corallum than above ; they vary from 1 to 

 6 cm. in length aud from 3 to 4 mm. in thickness, their apices being about 1 cm. apart. 

 Axial corallites 2"5 to 3 mm. broad, usually bearing lateral buds to within 2 or 3 mm. of the 

 apex ; some of the shorter twigs consist of simple, often arcuate corallites, spreading almost 

 at right angles, and broader at the apex than at the base. Radial corallites of the brauchlets 

 3 to 4 mm. long, 2 to 3 mm. broad, dimidiate, open nariform, very spreading, and distant ; 

 those of the stems and main branches short, appressed, verruciform, or with a sharply defined 

 ring-shaped border, rarely completely immersed. Corallum dense, but fragile on account of 

 the long slender brauchlets ; surface dense and striate, with very small echinulations and 

 granules ; wall strongly striate, not echinulate. 



• Red Sea ; ? Great-Barrier Reef. 



?a. Port Denison. Saville-Kent Coll. 92. 6. 8. 280. 



? b. Rocky Island. Saville-Kent Coll. 92. 6. 8. 276. (Young.) 



68. Madrepora diffusa. 



Madrepora diffusa, Verrill, Bull. Mus. Comp. Zool. 1864, vol. i. p. 41 ; Quelch, ' Challenger ' Reef- 

 Corals, p. 161. 



Corallum low, arborescent, much branched, recalling the habit of M. formosa ; brauchlets 

 divaricate, gradually tapering to an acute apex ; about 8 mm. thick and 5 to 7*5 cm. long. 



