MADEEPOEA. 



181 



distinctly rounded. The buds are at first nariform, but as the inner part of the wall becomes 

 developed they are more spreading and tubular; length 4 mm., diameter 2 mm., margin 

 scarcely ronnded. 



Pacific Ocean : Fiji, Samoa and Friendly Islands, Louisiade Archipelago, Great-Barrier 

 Reef, Torres Straits, Caroline Islands. 



A. Forma rosaria. 



a-e. ? 



f,ff. Ponape, Caroline Islands, 



h. ? 



i. Port Denison. 



j. Palm Island. 



Var. diffusa. 



a. Samoa Islands. 



Var. cespitosa. 



a-c. Tongatabu. 



B. Forma pyffmcBa. 



a-c. Fiji. 



d. Duch&teau Islands, Louisiade 

 Archipelago, 12 fath. 

 e~h. Low Woody Island. 

 i. Thursday Island. 



C. Forma dumosa. 



a, b. Port Darwin, 

 c, d. Palm Island. 



Purchased. 70. 4. 9. 1 to 5. 



Mus. Godeffroy. 81, 11. 21. 10 & 93. 4. 7. 95. 



? 93.4.7.96. 



Saville-Kent Coll. 92. 6. 8. 94. 

 Saville-Kent Coll. 92. 6. 8. 95. 



Purchased. 62. 1. 27. 2. 



J. J. Lister, Esq. [P.]. 91. 3. 6. 11, 12, & 13. 



H.M.S. 'Challenger.' 86. 12. 9. 234 & 407; 



91. 3. 5. 1. 

 J. Macgillivray, Esq. [P.]. 51. 9. 29. 35. 



Saville-Kent Coll. 92. 6. 8. 107 to 110. 

 Saville-Kent Coll. 92. 6. 8. 111. 



Saville-Kent Coll. 92. 6. 8. 205 & 206. 

 Saville-Kent Coll. 92. 6. 8. 207 & 208. 



194. Madrepora hydra. 



Madrepora longicyathus, Ortmann {non M.-Edwards & Haime), Zool. JB. 1888, Bd. iii. p. 150 ; ? VerriU, 

 BuU. Mus. Comp. Zool. 1864, vol. i. p. 41. 



Corallum bushy-arborescent; branches 1 cm. thick and up to 10 cm. long, with 

 numerous and crowded branchlets. Branchlets 3 to 4 cm. long, sometimes divided near the 

 base into 3 or 4 radiating twigs, which are usually 6 to 7 mm. thick. Axial corallites 3 mm. 

 diameter, 2 mm. exsert, margin much rounded, aperture very small. Radial corallites 

 usually about 4 mm. long and 2 mm. thick or a little over, appressed tubo-nariform, with a 

 thick wall and rounded margin, so as to give a small aperture in the centre of the upper 

 surface. Certain of the radial corallites are elongate tubular, 2 cm. long and 3 mm. thick, 

 with 1 to 6 small buds near the distal extremity, A star of 6 or 12 well-developed 

 septa occurs in the tubo-nariform corallites, the directives are frequently confluent. The 



2b 



