134 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
produced upward and visible from above. Apical system anterior; 4 
genital pores. Primary tubercles of the aboral side not very con- 
spicuous, scattered all over the interambulacra, also the posterior un- 
paired interambulacrum: on the sides of the test they may be dis- 
tinctly arranged in horizontal series. The primary spines curved at 
the base, directed backward, with a few distant serrations; secondary 
spines curved. Tridentate, rostrate, and triphyllous pedicellariae 
present ; but none of the globiferous type. Ophicephalous pedicellariae 
found in the young of one species (paucituberculatus). Color of test 
red, spines red or banded or yellowish. The denuded test white. 
Genotype: Hurypatagus ovalis, new species. 
The genus is nearly related to Maretia but differs from it in the 
open petals, the stronger development of the phyllodes, the greater 
posterior prolongation of the labrum, and the almost totally naked 
sternum. It is more nearly related to Platybrissus, from which it 
differs mainly in the character of the peristome. 
EURYPATAGUS OVALIS, new species 
Locality—Station 5217 (18°20’ N., 123°14’ KE.) ; 192 meters; April 
22, 1908. Five well-preserved specimens. 
Type.—vU.S.N.M. No. E.7159, from station 5217. 
Description.—The largest specimen is 88 mm. long, 66 mm. broad, 
and 26 mm. high; the smallest is 71 mm. long, 55 mm. broad, and 20 
mm. high. 
The above description of the genus Hurypatagus applies equally to 
the species ovalis; a more detailed description therefore need not be 
given here. <A full description, with illustrations, will be given in 
volume 5 of the Monograph of the Echinoidea. It may be stated here 
only that the tridentate pedicellariae occur in two forms, a large form, 
up to 1.5 mm. in length of head, with very slender, slightly curved 
valves, wide apart, meeting only at the point, and a smaller form with 
broader, spoon-shaped valves. The spines are to a varying degree 
red-brown with lighter bands. 
Genus GYMNOPATAGUS Doderlein 
GYMNOPATAGUS MAGNUS A. Agassiz and H. L. Clark 
Gymnopatagus magnus A. AGAssiz and H. L. Ciark, Bull. Mus. Comp. Zool., vol. 
51, p. 188, 1907.—H. L. CiarK, Hawaiian and other Pacific Echini, Echi- 
noneidae .. . Spatangidae, p. 231, pl. 146, fig. 13; pl. 159, fig. 1, 197. 
Gymnopatagus sewelli KOEHLER, Echinoderma of the Indian Museum, Echinoidea, 
pt. 1, Spatangidés, p. 98, pl. 13, figs. 1-7; pl. 19, figs. 51-60, 1914. 
Localities.—Station 5332 (lat. 12°47’ N., long. 120°41’ E.) ; 1,363 
meters; December 18, 1908. One young fragmentary specimen. 
Station 5349 (lat. 10°54’ N., 118°26’ E.) ; 1,336 meters; December 
27,1908. Fragments of two large specimens. 
