MADKEPOEA. 67 



spreading tubular^ 4 to 5 mm. long and 2 to 2"5 mm. diameter, margin narrowed above; the 

 larger ones bear 2 or 3 bud-corallites. Between the prominent corallites already described 

 numerous immersed, subimmersed, or half-tubular ones with a relatively thin wall occur, 

 from 1 to 1'5 mm. in diameter. Septa of the axial and tubular proliferous corallites in two 

 cycles, moderately developed, those of the small radial corallites have broad directive septa 

 and a rudimentary secondary cycle. In the immersed corallites all the septa are narrow. 

 Corallum porous ; surface spongy, spinous ; wall reticulate and echinulate when thin, the 

 echinulations being arranged in lines near the base ; in the older parts the corallum becomes 

 denser and the surface finely echinulate. 



The specimen in the Paris Museum which I take to be the type of Lamarck has the 

 large tubular corallites at an angle of about 80°, all are proliferous and from 5 to 13 mm. 

 long, bearing radial bud-corallites in proportion to their length. There are from 4 to 6 pro- 

 liferations distributed to each 2'5 cm. according to size. The space between them is filled in 

 with immersed and short half-tubular corallites, with the wall echinulate and scarcely striate. 



The synonymy of this species is difficult to make out, owing to so many forms having 

 been referred to under the same name. The following, at any rate, appear distinct : — 



Madrepora abrotanoides, Michelotti. = Madrepora ? lavandula, Michelin (fossil) . 



M. abrotanoides, Audouin. = Montipora cristagalli, Ehrb. 



M. abrotanoides, Ehrenberg. = ,Madrepora erythrma, Klunz. 



M. abrotanoides, Dana. = Madrepora polymorpha, Brk. 



Pacific Ocean : Tahiti, Great-Barrier Reef, Singapore. 



a, 6. Tahiti. H. M.S. 'Challenger.' 86. 12. 9. 80 & 279. {= M. darus, Qxidch.) 



c, d. ? Purchased. 44. 6. 10. 2 & 7. 



e. ? ? 93. 4. 7. 60. 



/. Singapore. G. B. Sowerby, Esq. [P.] . 93. 4. 7. 59. 



h. Rocky Island. ; Saville-Kent Coll. 92. 6. 8. 279. 



37. Madrepora danae. 



Madrepora deformis, Dana (non Michelin), Zoophytes, p. 484, pi. xliii. fig. 1 ; M.-Edwarda <fc Haime, 



Coralliaires, t. iii. p. 149. 

 Madrepora danai, M.-Edwards & Haime, Coralliaires, t. iii. p. 560 (errata). 

 Madrepora danw, VerriU, Bull. Mus. Comp. Zool. vol. i. 1864, p. 41 ; Verrill, in Append. Dana's Corals 



& Coral Islands, 1875 ed. p. 333 ; Rathbun, Proc. U.S. Nat. Mus. 1887, vol. x. p. 15 {non 



Quelch, ' Challenger ' Eeef Corals, p. 151). 



Corallum subcespitose, consisting of a few simple or subsimple branches, 15 cm. long 

 and 2'5 cm. or more thick, subterete, obtuse, subproliferous, and often coalescent. Coral- 

 lites unequal, some are tubular, 4 to 6 mm. long and 2 mm. diameter, others are proliferous 

 and aeervate, others again very short, but none are obsolete ; exterior striate. [Dana.) 



It appears probable that this species may prove to be a variety of M. abrotanoides, Lamk. 

 {non Dana) . Judging from the description and figures of Dana, it appears to difPer from 

 Lamarck's species chiefly in the following points: — 1. The branches are not tapering, and 



