REPORT ON THE REEF-CORALS. 157 
24. Madrepora millepora (Ehrenberg.) 
Heteropora millepora, Ehrenberg, Cor. roth. Meer., p. 109. 
Madrepora millepora, Dana, Zoophytes, p. 446, pl. xxxiii. fig. 2. 
Only a single specimen of this species was obtained. It has grown with an inerusting 
base over a mass of dead coral, and is made up of a mass of closely crowded, young 
colonies in different stages of growth; some with simple stems, others forming small and 
much branched clumps; while in other places, on the incrusting base, there are numerous, 
large, apical calicles, from which new branches originate. The calicles on the branches 
and branchlets are about 1 mm. broad, but they are usually much smaller on the base. 
Locality.—Api, New Hebrides. 
25. Madrepora minima, n. sp. (Pl. IX. figs. 4-4a). 
Corallum arborescent, spreading-ramose, very slender, often slightly compressed and 
incrusting dead coral where it comes in contact with it ; branches rather short, terete, 
bluntly pointed, from about 4 to 6 mm. thick, with few, short, scarcely smaller branchlets ; 
not infrequently the branches on meeting a foreign body spread over it and become broad 
and thickened. Apical calicles moderately large, nearly 3 mm. in diameter, scarcely 
prominent with six large and six small well-developed septa. Lateral calicles very small, 
unequal, and crowded, from about 0°5 to 0°75 mm. in diameter, scarcely prominent, 
quite immersed below, fragile, strongly striated, round-nariform or sublabellate; six 
septa distinct, with two larger than the others, the second cycle rudimentary. The 
surface is finely echinulate, of a close texture below, becoming somewhat porous above. 
This species is close to Madrepora exigua, Dana, but is easily distinguished from 
it. Two small specimens about 9 cm. high were obtained, and many of the branches 
have a peculiar appearance, spreading over and incrusting pieces of dead coral. 
Locality.—Api, New Hebrides. 
26. Madrepora tenuis, Dana. 
Madrepora tenuis, Dana, Zoophytes, p. 451. 
Numerous specimens of this species were obtained. The branchlets are very numerous 
and slender, but are often as much as 5 or 6 mm. thick at their base. 
Locality.—Samboangan, Philippines. 
27. Madrepora rosacea, Esper. 
Madrepora rosacea, Esper, Pflanz., i., Madrep. pl. xv. 
Studer, Monatsber. d. k. preuss, Akad. d. Wiss. Berlin, 1878, p. 530. 
” ” 
Three specimens were obtained, of which one forms a cespitose clump with close 
branches, subdividing into numerous branchlets above. The calicles are narrow but very 
