140 RECENT UNSTALKED CRINOIDS 
then becoming triangular, about as long as broad and 
after the proximal fourth of the arm wedge-shaped and 
about as long as broad, and somewhat longer distally. 
P, is 5.5 mm. long with fifteen segments, of which 
the first is very short, the second somewhat longer, the 
third nearly as long as broad, the fourth slightly longer, 
and the seventh and following about twice as long as 
broad; the pinnule is small and slender and tapers evenly 
from the base to a slender and delicate tip; there is a 
slight dorsal swelling on the second and third segments; 
P, is 7.5 mm. long with sixteen segments, resembling 
P, but proportionately stouter; the distal edges of the 
third and following segments are slightly produced and 
finely spinous; the second and third are slightly thickened 
dorsally; P, is 12 mm. or 13 mm. long with twenty-two 
segments, resembling P, but proportionately stouter; P, is 
from 5 mm. to 5.5 mm. long with fourteen segments, 
similar in size to P,, but with very slightly shorter seg- 
ments distally; P, is 6 mm. long with fifteen segments, 
slightly stouter than P, and not tapering so rapidly; the 
following pinnules are similar to P,; the distal pinnules 
are 6.5 mm. long, very slender, with sixteen segments, 
which are much elongated. 
Type locality. — »Siboga” Station N°. 96. 
Psathyrometra major, sp. nov. 
This species is closely related to Ps. mira. 
The centrodorsal is conical with the tip rounded off, 
5.5 mm. broad at the base and 5 mm. long (measured 
along the sides); it is divided into five areas by five inter- 
radial furrows which are about as broad as the adjacent 
columns of cirrus-sockets; these furrows are somewhat 
deeper and more V-shaped than are those of Ps. mira; 
the cirrus-sockets are essentially as in Ps. mira, but the 
median column, instead of consisting of only a single 
socket, includes two sockets with, in two cases, a more or 
Notes from the Leyden Museum, Vol. XXXIV. 
