110 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
Remarks.—So far as it is possible to decide from dead tests alone, 
these specimens must be referable to /. acuta; but it would have been 
important to ascertain whether they agree with the typical acuta in the 
buccal membrane containing calcareous plates and in the presence of 
globiferous pedicellariae. 
FIBULARIA sp. (7) 
From Port Binang, Subic Bay, Luzon, there is a small dead test that 
I cannot with certainty identify with any known fibulariid. There 
are traces of internal radiating partition walls; I cannot therefore even 
say definitely whether it is an E'chinocyamus or a Fibularia. It is too 
incomplete (apical system lost) for being described or named; but it 
may be worth while mentioning the existence of such a small fibulariid 
at the Philippines. 
The specimen measures 4 by 3.2 by 2mm. It is of ovoid outline. 
Petals short, with 3 or 4 pore-pairs. Peristome central, round; peri- 
proct much smaller, elliptical, midway between peristome and 
posterior end of test. 
Order SPATANGOIDA 
Family URECHINIDAE 
Genus PLEXECHINUS A. Agassiz 
PLEXECHINUS SPECTABILIS, new species 
Locality.—Station 5359, Sulu Sea (lat. 8°13’ N., Jong. 120°37’ E.) ; 
4,163 meters, January 9, 1909. Nine specimens, in the main in fair 
condition. 
Type.—U.S.N.M. No. E. 7161 from station 5359. 
Description——The shape of the test is that typical of Plexechinus, 
only the anal snout is somewhat more projecting than in the other 
species of the genus. The sternum rises into a conspicuous keel. The 
largest specimen is 33 mm. long, 27 mm. broad, about 21 mm. high 
(the sternum broken) ;.the smallest specimen is 28 mm. long, 23 mm. 
broad, 18 mm. high. There is no frontal depression, but adorally the 
frontal ambulacrum is somewhat depressed. The phyllode is fairly 
well developed, with 2 or 3 penicillate tube feet in each series, quite 
conspicuous on account of their dark, brownish color. 
There are four genital pores, each superseded by a long genital 
papilla. ‘The two anterior pores are placed in one unpaired plate, the 
two posterior pores each in its own large plate; the anterior and 
posterior genital pores are rather widely separated from each other by 
a couple of plates as large as the posterior genital plates; most prob- 
ably these separating plates are the anterolateral ocular plates. The 
peristome is more or less conspicuously oblong. The upper part of 
the periproct may rise as a hood over the lower part; but there is a 
