ANNOTATED LIST. 135 
“Ophiomastix asperula?.”” As a matter of fact, asperula is not known from the Indian 
Ocean; the type locality is Fiji, and the only other places from which it is known are 
Amboina, where it seems to be common, and the little island of Kaniungan Ketjil, on the 
eastern coast of Borneo, where the Siboga took one specimen. At Mer asperula is rare and 
only three specimens were found; all occurred under coral fragments on the southeastern 
reef-flat. The largest is 20 mm. across the disk, and has arms 90 mm. long; it is thus con- 
siderably larger than any other specimen recorded. 
Ophiomastix mixta. 
Liitken. 1869. Add. ad Hist. Oph., pt. 3, p. 42—Matsumoto. 1917. Japan. Oph., p. 348, fig. 97. 
(Plate 14, Figure 2.) 
The handsome claret-red color! of this fine species is very fugacious and leaches out 
in fresh water and in every preserving fluid which I tried; after death it even leaches out 
in salt water. It was impossible to preserve the color, even in dried specimens, for any 
length of time. Those which retain the most color become orange, but even that shade 
fades and nearly all preserved specimens are yellowish, pale brownish, or nearly white. 
In size, mixta ranks among the smallest members of the genus. Matsumoto (1917) gives 
a figure of a specimen 20 mm. across the disk, but the largest specimen I have seen is 16 mm. 
in disk-diameter and has the arms about 64 mm. long. In most specimens the arms are 
approximately 5 times the diameter of the disk. Brock (1888) says the specimens he found 
at Amboina were all small, and few of those we found at Mer are more than 12 mm. across 
the disk. 
The covering of granules shows more or less diversity in different individuals, but the 
growth-changes are not remarkable, for very small specimens do not have the disk-covering 
like an Ophiocoma. In some adults the granule-coat is quite like an Ophiocoma, except 
near and at the margin, but in others the spinelets are sufficiently long and numerous to 
indicate clearly an Ophiomastix. The claviform spines are lacking in most young speci- 
mens, but they are frequently, if not always, well-developed in adults. Koehler (1905) is 
certainly mistaken in thinking that the presence of claviform spines shows that the speci- 
men is not mizta. 
The type-localities of mixta are Fiji and Samoa. Brock (1888) found it common at 
Amboina. Bell (1899) records it from the Loyalty Islands, and Koehler (1905) from the 
northern point of Timor. It seems to be common at Misaki, Japan, but it is not yet known 
from the Philippines. At Mer it is fairly common in the dead portions of colonies of Porites, 
Pocillopora, Acropora, and Seriatopora on the southeastern reef-flat. It also occurred 
occasionally under rock fragments. There is certainly no obvious correlation between the 
color and the environment. 
Ophiomastix elegans. 
Brock. 1888. Zeit. f. w. Zool., 47, p. 500. 
This species is unfortunately known only from the holotype taken by Brock at 
Amboina. While allied to mizta, it is evidently quite a distinct species. 
Ophiomastix annulosa. 
Ophiura annulosa Lamarck. 1816. Anim. s. Vert., 2, p. 543. 
Ophiomastiz annulosa Miiller and Troschel. 1842. Syst. Ast., p. 107.—Déderlein. 1896. Jena. Denkschr., 8, 
pl. xvi, fig. 11. 
(Plate 14, Figure 6.) 
This is one of the large species of Ophiomastiz, having the disk 25 to 30 mm. across 
and arms about eight times as long as that. The claviform spines are numerous and usually 
1 The fine speckling with black, seen with a lens in figure 2, plate 14, is not present on the brittle-star itself, 
but is a device adopted by the lithographer for deepening the red color where necessary. The banding of the arms 
with gray, which is always present distally to a greater or less degree, is poorly indicated in the figure. 
