82 MADREPORARTA. 
The fragments on which the species is founded are too much broken to admit of a proper 
description being given; but the broad flattened branches (1°5 em. diameter) with a few 
irregularly scattered corallites on the under surface and short spiciform branchlets above 
appear to indicate a new species. Bassett-Smith records the habitat as “ Macclesfield and 
Tizard Banks.” All three specimens are labelled ‘‘ Macclesfield Bank,” and two are so very 
small that it is useless to try and identify the species ; they do not agree with any part of the 
larger specimen preserved. 
During the more recent exploration of the Macclesfield Bank by H.M.S, ‘ Penguin’ a 
number of fragments which possibly belong to this species were again obtained. All are 
evidently only the marginal portions of a colony, and do not show the flattened branches of 
the more central divisions, but agree better with the smaller fragments of the original 
collection. The under surface is provided with distant appressed tubular corallites, usually 
with the inner part of the wall scarcely free. On the upper surface certain corallites give rise 
to suberect twigs about 1°5 cm. long and 4 mm. diameter at the base, the apices being about 
1 em. apart, simple or proliferous. Axial corallites cylindrical, scarcely 2 mm. diameter, 1 to 
4mm. exsert ; wall thin; septa well developed, particularly the primaries, which sometimes 
meet in the middle line. A few of the marginal axial corallites are 2°7 mm. diameter and 
scarcely exsert. The radial corallites are appressed, tubular, with the inner part of the wall 
only free in elongate individuals; length 3 to 5 mm., diameter 1°5 mm.; wall striato-echinu- 
late ; primary septa narrow, but the directives distinctly broader, the second cycle usually 
wanting. ‘This form has more elongate and more distant corallites than the type, and may 
not belong to the same species. It appears nearly related to MW. dilatata. 
China Sea: Macclesfield Bank, 20 to 27 fathoms. 
a. Macclesfield Bank. H.M.S. ‘Rambler.’ 89. 9. 24. 54. o 
b-d. Macclesfield Bank. H.M.S. ‘Rambler’ 89. 9. 24.13 & 15; 5, 
93, 4. 7. 167. Ee 
e-g. Macclesfield Bank, 13 fath. H.M.S. ‘Penguin.’ 92. 10.17. 75 to 77. 
h-j. Macclesfield Bank, 18 to 28 fath. H.M.S. ‘Penguin.’ 92. 10. 17. 28 to 30. 
71. Madrepora nana. 
Madrepora nana, Studer, MB. Akad. Wiss. Berlin, 1878, p. 538, pl. ii. fig. 6. 
Corallum small, consisting of a few little-divided, slender, gradually tapering branches, 
not over 2 cm. long and 4 mm. thick, which arise from an incrusting base. Axial corallites 
cylindrical, 1 mm. broad and 1 mm. exsert. Radial corallites rather distant, appressed, 
nariform or tubo-nariform, with circular aperture, 0°5 mm. long and 0°7 mm. broad ; star 
distinct, the directive septa rather more prominent than the others. Ccenenchyma porous ; 
surface finely striate. 
The small size or the colony renders it possible that the characters of the species are not 
completely developed in the type specimen. 
Pacific Oceean: Matuku, Fiji Archipelago (Berlin Museum). 
