130 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
cral spaces narrow, in correspondence with the broad ambulacra; 
their tubercles not conspicuous. The labrum is prolonged posteriorly 
only to the end of the second adjoining ambulacral plates. The 
sternum is densely covered with spines throughout. 
The apical system, which is slightly anterior, has four genital pores, 
as typical of the genus; the madreporite is not much prolonged 
posteriorly. The peristome is large, rounded, not at all sunken; the 
labrum does not form a prominent lip, the mouth opening being rather 
far anterior to it. The rather large periproct is close to the upper 
edge of the vertical posterior end of the test; it appears to be slightly 
sunken at its lower edge. 
The primary aboral spines are all broken but apparently are about 
half the length of the test; they are curved basally. To judge from 
the part preserved they are entirely smooth. Secondary and miliary 
spines curved as usual; those at the posterior end longer, forming 
together with those of the subanal plastron a fence around the 
periproct. The spines of the sternum and the oral interambulacra are 
not widened distally. 
The peripetalous fasciole is slightly sinuate in the posterior inter- 
ambulacrum, straight in the posterolateral interambulacra, but bends 
downward at a right angle a little before the anterior petals, then 
disappears before reaching the frontal ambulacrum. The subanal 
fasciole has an anterior angle; the posterior band straight. 
Pedicellariae of the tridentate, rostrate, ophicephalous, and tri- 
phyllous types, not very characteristic. Globiferous pedicellariae 
not observed. 
The color is a light reddish on the aboral side, whitish on the oral 
side. The large aboral spines banded with narrow red-brown bands; 
also the spines of the oral side are thus banded. 
Remarks.—This species appears to be the nearest related to Zupata- 
gus lymani (Lambert and Thiéry) (the Gymnopatagus pulchellus of 
H. L. Clark), with which it agrees in the color. It is, however, 
markedly distinct from it in the labrum being much shorter; also it 
appears that the shape of the test is different, not so high in lymani 
as in the present species. 
Genus SPATANGUS Klein 
SPATANGUS sp. 
Locality—Station 5565 (lat. 5°52’ N., long. 120°30’ E.) ; 445 meters; 
September 21, 1909. One specimen. 
Remarks.—The specimen is an old naked test; it was broken to 
pieces, but it was possible to glue the fragments together so as to form 
a fairly complete test. 
