MADREPORA. 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 rounded. 
Pacific Ocean : Fiji, Samoa and Friendly Islands, Louisiade Archipelago, Great-Barrier 
Reef, Torres Straits, Caroline Islands. 
A. Forma rosaria. 
a-e. ? Purchased. 70. 4. 9. 1 to 5. 
fig. Ponapé, Caroline Islands. Mus. Godeffroy. 81. 11. 21. 10 & 93. 4. 7. 95. 
h ? ? 98. 4. 7. 96. 
i. Port Denison. Saville-Kent Coll. 92. 6. 8. 94. 
j. Palm Island. Saville-Kent Coll. 92. 6. 8. 95. 
Var. diffusa. 
a. Samoa Islands. Purchased. 62. 1. 27. 2. 
Var. cespitosa. 
a-c. Tongatabu. J. J. Lister, Esq. [P.]. 91. 3. 6. 11, 12, & 13. 
B. Forma pygmea. 
a-c. Fiji. H.M.S. ‘Challenger. 86. 12. 9. 234 & 407 ; 
Ole Be is He 
d. DuchAteau Islands, Louisiade J. Macgillivray, Esq. [P.]. 51. 9. 29. 35. 
Archipelago, 12 fath. 
e-h. Low Woody Island. Saville-Kent Coll. 92. 6. 8. 107 to 110. 
i. Thursday Island. Saville-Kent Coll. 92. 6. 8. 111. 
C. Forma dumosa. 
a, 6. Port Darwin. Saville-Kent Coll. 92. 6. 8. 205 & 206. 
c, d. Palm Island. 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; ? Verrill, 
Bull. 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 4mm. 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 
