MADREPOEA. 175 



Judging from his description I am inclined to refer the Ceylon form recorded by 

 Ortmann to this variety. 



Indo-Pacific Ocean : Red Sea, Ceylon, Great-Barrier Reef, Solomon Islands. 



a. Koseir, Red Sea. Dr. Klunzinger [C] . 86. 10. 5. 7. 



b. Red Sea. ? 43. 12. 20. 10. 



c. Ceylon. Haeckel Coll. 92. 12. 5. 23. 



Var. fortis. 



a. Koseir, Red Sea. Dr. Klunzinger [C.]. 86. 10. 5. 9. 



Var. obtnsata. 



a. Koseir, Red Sea. Dr. Klunzinger [C.]. 86. 10. 5. 38. 



b. Port Denison. Saville-Kent Coll. 92. 6. 8. 144. 



Var. depressa. 



a. Shortland Island, Solomon Islands. Dr. Guppy [P.]. 84.12.11.22. 



188. Madrepora tubulosa. 



HeUropora tubulosa, Ehrenberg, CoraUenth. d. roth. Meeres, p. 110. 



Madrepora tubulosa, Dana, Zoophytes, p. 488 ; M.-Edwards & Haime, CoraUiaires, t. iii. p. 148 ; Studer, 

 MB. Akad. Wiss. Berlin, 1878, p. 532, pi. ii. fig. 4. 



Studer supplies the following particulars of Ehrenberg's type : — 



The specimen consists of a branch 15 cm. long and 16 cm. thick, scarcely tapering, 

 apex broken away. Radial corallites stout tubular, elongate, and thick-walled, some are 

 proliferous, with appressed subnariform bud-corallites. On the stouter parts a few immersed 

 corallites are scattered between the others. Corallum very porous, surface echinulate. One 

 of the ' Gazelle ' specimens, from New Guinea, has the longest corallites, 8 mm. long and 

 3"5 mm. thick. 



A specimen in the collection from Ponape has the following characters : — Corallum 

 fruticose, consisting of several (probably over a dozen) stems arising from a base of dead 

 coral ; some are 16 cm. long, simple and gradually tapering, others very much divided, and 

 bear much-crowded and proliferous branches, about 11 cm. long and 8 to 12 cm. thick. 

 Axial corallites not larger than the largest radial ones, 3 to 3-5 mm. thick, usually about 

 2 mm. exsert ; wall very thick, margin much rounded, aperture small, rarely circular. The 

 radial corallites vary considerably in different parts of the colony ; on the more proliferous 

 twigs they are ascending (angle 45°) tubular, unequal in size, 4 to 7 mm. long and 2 to 3 mm. 

 thick, the stouter ones closely resemble the axial corallites and often bear buds ; the others 

 tubo-nariform and until the inner part of the wall attains its full thickness the aperture is 

 not central. Between these, but some distance below the apex, nariform, appressed tubular, 

 subimmersed and immersed coralhtes occur. On the elongate simple branches the condition 



2a2 



