REPORT OF THE ECHINOIDEA—MORTENSEN 125 
end is vertical or at most sloping very slightly posteriorly. It reaches 
a conspicuous size, the largest specimen being 76 mm. long. 
The shape of the petals is like that of luzonica, or even rather that 
of B. parallela, the posterior petals being to a high degree confluent, 
diverging only at the very end. Together with the narrow separating 
bridge of the posterior interambulacrum they are, in the adult speci- 
mens, quite markedly sunken. The whole of the petaloid area is re- 
markably small, less than half the length of the test. The plates of 
the anterolateral ambulacra outside the petals are rather broad, each 
with a number of tubercles, leaving the midline naked. It is a rather 
peculiar feature that fairly large conical tube feet issue from the 
innermost 4 or 5 rudimentary pores of the anterior series of the antero- 
lateral petals. There are only 3 tube feet to each side within the 
subanal fasciole. The edge of the sucking disk of the frontal ambula- 
crum is not lobed. 
The anal branches from the subanal fasciole are lacking; in one 
specimen, however, the merest traces of these branches are observable. 
The globiferous pedicellariae occur in one form only; the valves are 
coarse, terminating in two strong teeth. These pedicellariae occur 
mainly in the anterior ambulacra on the oral side but may sometimes 
be found also in the posterior ambulacra and even in great numbers; 
they are very dark colored. The tridentate pedicellariae occur in two 
forms, one with slender valves, with the edges rather coarsely dentate 
in the lower part of the blade, the other with broad, spoon-shaped 
valves; this latter form is found only in the petals. Ophicephalous 
pedicellariae appear to be totally lacking. 
Remarks.—The two specimens from station 5468 differ from the 
others in having the posterior petals distinctly longer than the an- 
terior ones. Only the aboral side of the test is preserved, though not 
completely ; it has the appearance that the petals are less broad than is 
typical of the species. Not one of the characteristic broad-valved tri- 
dentate pedicellariae is found ; but the conical tube feet of the adapical 
rudimentary pores of the anterior series of the anterolateral petals are 
well developed, and the plates outside the petals of the anterolateral 
ambulacra are broad and tuberculated as typical of B. micropetala. 
I think it the best course for the present to designate these specimens as 
a variety of B. micropetala without giving a definite varietal name, 
because there is no certainty that they actually belong to this species. 
BRISSOPSIS OBLIQUA, new species 
Locality.—Station 5421, between Panay and Guimaras; 251 meters; 
March 20, 1909. Three specimens. 
Type.—vU.S.N.M. No. E.7156, from station 5421. 
