MADREPORA. 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. 28. 
Var. fortis. 
a. Koseir, Red Sea. Dr. Klunzinger [C.]. 86. 10. 5. 9. 
Var. obtusata. 
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. 
Heteropora tubulosa, Ehrenberg, Corallenth. d. roth. Meeres, p. 110. 
Madrepora tubulosa, Dana, Zoophytes, p. 488 ; M.-Edwards & Haime, Coralliaires, t. iii. p. 148; Studer, 
MB. Akad. Wiss. Berlin, 1878, p. 582, pl. ii. fig. yay 
Studer supplies the following particulars of Ehrenberg’s type :— 
The specimen consists of a branch 15 cm. long and 16 em. 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. Corailum 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 Ponapé 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 em. thick. 
Axial corallites not larger than the largest radial ones, 3 to 3°5 mm. thick, usually about 
9 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, 4to 7 mm. long and 2 to 8 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 corallites occur. On the elongate simple branches the condition 
2a2 
