124 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
mm. long. Another marked difference between the two species is 
found in the anterolateral ambulacra outside the petals; in both species 
they are very narrow, but while in /wzonica each plate carries one or 
a few tubercles, in simelds they are quite naked (apart from the minute 
miliary tubercles observable only on a higher magnification). This 
character is particularly useful for distinguishing the young speci- 
mens of the two species, the tubercles being present already in quite 
young specimens of luzonica. As in luzonica, there are four penicil- 
late tube feet to each side within the subanal fasciole. 
A further conspicuous character of B. similis is that the adapical 
tube feet of the frontal ambulacrum are very long, almost black, with 
a small, lobed sucking disk; no spicules are found in these tube feet. 
The anal branches from the subanal fasciole are distinct. Finally 
the pedicellariae, particularly the globiferous ones, offer a very marked 
distinction from luzonica,; while in the latter species the valves of the 
globiferous pedicellariae, both sorts of them, terminate in two long 
divergent teeth; in simélis they terminate in six small teeth surround- 
ing a terminal opening. The tridentate pedicellariae are usually 4- 
valved; the valves have some long thorns along the edges of the lower 
part of the blade. The rostrate and ophicephalous pedicellariae are 
like those of duzonica, but only one form of the ophicephalous 
pedicellariae has been observed. 
t is interesting to find that this is the species common in the deeper 
parts of the Philippine seas, while B. duzonica was not taken there at 
all by the Albatross. 
BRISSOPSIS MICROPETALA, new species 
Localities —Station 5201, Leyte Island (lat. 10°10’ N., long. 125°04’ 
EK.) ; 1,014 meters; April 10, 1908. One specimen. 
Station 5424, Jol6 Sea (lat. 9°37’ N., long. 121°13’ KE.) ; 622 meters; 
March 31,1909. One young specimen. 
Station 5468, Atalayan Island (13°36’ N., long. 123°40’ E.) ; 1,041 
meters; April 18, 1909. ‘Two fragmentary specimens, which must be 
regarded as belonging to a variety of the species; see below. 
Station 5513, north of Mindanao (lat. 8°17’ N., long. 124°03’ E.) ; 
924 meters; August 7, 1909. Three large specimens. 
Station 5520, Mindanao (lat. 8°41’ N., long. 123°18’ E.) ; 187 meters; 
August 10, 1909. One specimen. 
Station 5527, near Bohol (lat. 9°22’ N., long. 123°43’ E.); 717 
meters; August 11,1909. Five specimens. 
Type.—uU.S.N.M. No. E.7155, from station 55138. 
Description.—This species is characteristic by the shape of its test, 
which is almost as broad as long; it is rather low, rising gradually 
toward the posterior end, the point of greatest height. The posterior 
