169 
and flexible. This specimen differs from the type from Mortlock 
Island in the greater length and stiffness of P, and in the greater 
number of arms (the latter having but seventeen); but the specimen 
from Torres Strait referred to this species by Hartlaub has an ex- 
ternal III Br series. 
Singapore. November 27, 1907. One large specimen 
with thirty-one arms (III Br series being developed in -2, 1, 1, 2 
order), 100 mm. long, resembles in general the preceding. The 
cirri are XXVIII, 20—23, 15 mm. to 20 mm. long; P, is very 
slender, 12 mm. or 13 mm, long, with twenty-two to. twenty-seven 
joints; P, is very stout and stiff, 15 mm. long, with twelve or 
thirteen joints; P, is 7 mm. long, slightly stouter basally than P,, 
rapidly tapering, with twelve joints; P 4 and the following pinnules 
are small and weak, 4 mm. long, with ten joints. 
Previously known only from Mortlock Island in the Carolines 
and from Torres Straits, the proved occurrence of this species in 
the Tonga and Nicobar Islands and at Singapore greatly extends its 
known range. It has also been found recently among the Philippine 
Islands by the United States Fisheries Steamer ”"Albatross”. 
The specimen from the Nicobars agrees more nearly with 
Hartlaub's example from the Carolines than with the one from 
Torres Straits. 
Stephanometra marginata (P. H. Carpenter). 
Antedon marginata 1888. ka H. Carpenter, Challenger” Reports, Vol. 
26, Zoology, p. 230, pl. 4 
Dishyoinétra eng fred A.H. Clark, Proc. Biol. Soc. Washington, 
Vol. 22, p.:1 
le. November 27, 1907. One magnificent spe- 
cimen with exactly twenty arms 95 mm. long, and cirri XXV, 24, 
20 mm. long; P, is 11 mm. long with 18 joints, stiff and spine- 
like, the terminal 4—6 joints abruptly less in diameter than those 
immediately preceding, giving the pinnule tip the appearance of 
having been broken off and subsequently repaired as described by Car- 
benter, and also noticed by Chadwick in a specimen from Ceylon. 
