REPORT OF THE ECHINOIDEA—MORTENSEN 129 
ica, aS maintained by H. L. Clark, op. cit. 1917, cannot be doubted. 
The few specimens with both kinds of ophicephalous pedicellariae 
I have seen, among which is one of the Albatross specimens, differ in 
no other way from typical Zuzonica. On the other hand, I cannot at 
all agree with Clark in regarding oldhami and bengalensis as syn- 
onyms of Juzonica; as will be set forth in volume 5 of my Monograph 
of the Echinoidea, I must regard these two as perfectly distinct species. 
On the whole, I think it beyond doubt that the Brissopsis “luzonica” 
of Clark’s works of 1917 and 1925, as well as that of de Meijere in his 
Siboga Echinoidea, will be found, on a careful revision, to contain 
various species, among which no doubt will be the species here described 
as Brissopsis similis. To judge from the characters of the petals alone 
the several specimens of this latter species would evidently have been 
referred to duzonica, according to the literature the only species occur- 
ring in the Malay region; a careful examination of the material 
collected by the Albatross shows that no less than six different species 
of Brissopsis occur there, and of these B. similis appears to be the most 
common. 
Genus EUPATAGUS L. Agassiz 
EUPATAGUS RUBELLUS, new species 
Locality.—Station 5158, Tinakta Island (lat. 5°12’ N., long 119°55’ 
E.) ; 22 meters; February 18, 1908. One specimen. 
Type.—U.S.N.M. No. E.7157, from station 5158, 
Description—The specimen is 22 mm. long, 19 mm. broad, and 14 
mm. high; probably it is not adult, though the genital pores are well 
developed. 
The test is regularly egg-shaped, not flattened on the oral side. The 
vertex is a little behind the apical system. The petals are short but 
well formed, the posterior slightly the longer. There are 10 pore- 
pairs in the posterior series of the anterior petals, 12 in the posterior 
series of the posterior petals; in the anterior series of the anterior 
petals only the 7 distal pore-pairs are well developed, the proximal 
3-4 quite rudimentary. The frontal ambulacrum almost flush with 
the test, with only the merest indication of a frontal depression. 
Phyllodes quite rudimentary. The posterior ambulacra broad, naked ; 
plates 6-9 (10) prolonged within the subanal fasciole, so that there 
will probably be three tubefeet to each side within the fasciole. There 
are 2 or 3 large tubercles (spines) within the peripetalous fasciole to 
each of the paired interambulacra, none in the posterior interambula- 
crum. Some larger secondary tubercles to each side of the frontal 
ambulacrum, not arranged in regular transverse series. The plates 
of the aboral side otherwise rather densely covered with small second- 
ary and miliary tubercles (spines). On the oral side the interambula- 
