OF THE SIBOGA-EXPEDITION. 143 
arm bases are rugged, showing the affinity of this form 
with the other larger species of the genus. 
P, is apparently exceedingly slender and delicate, com- 
posed of segments which become very greatly elongated 
distally; the first segment is broader than long, the next 
five about as long as broad, the seventh slightly longer 
than broad; P, is much stouter than P,; the first four 
segments are short, the following rapidly becoming elong- 
ated and being exceedingly long distally. 
Type locality. — »Siboga” Station N°. 45, 
Psathyrometra anomala, sp. nov. 
The centrodorsal is low rounded conical, 1.7 mm. in 
diameter at the base and about 1 mm. in interradial height ; 
the bare dorsal pole is small; the radial areas are delimited 
by narrow irregular lines; there are twenty large cirrus 
sockets, four in each radial area, in two closely crowded 
columns. 
P, bears a gonad. 
Type locality. — »Siboga” Station N°. 211. 
Nanometra clymene, sp. nov. 
The centrodorsal is long, rounded conical, about 3.5 mm. 
in basal diameter and about 3 mm. long from the proximal 
border to the dorsal pole; the dorsal pole is 2 mm, in 
diameter, slightly concave; the cirrus-sockets are arranged 
in four or five closely crowded regularly alternating rows 
or four closely crowded alternating columns in each radial 
area, though without any indication of interradial divisions. 
The cirri are about LXX, 43—47, 25 mm. to 30 mm. 
long, moderately slender; the first segment is very short, 
the second about twice as broad as long or somewhat 
broader, the third nearly as long as broad, the fourth about 
one third longer than broad, the sixth-eleventh or -twelfth 
about twice as long as broad; the following gradually 
Notes from the Leyden Museum, Vol. XXXIV. 
