162 
tip; the fourth to the sixthb joints are squarish, the following 
gradually increasing in length, being about twice as long as broad 
distally; the second to the fifth or sixth joints are, as in the 
second, rather strongly carinate; P, shorter than P,, ånd less 
stout and stiff, composed, like the following, of mostly squarish joints. 
This specimen is so different from the one from Sydney that 
I at first thought it was a representative of another species, and 
from it I therefore drew up the preceding description. Subsequently, 
however, I had the opportunity of studying the series belonging 
to the Indian Museum at Calcutta which proved to my satisfaction 
that the two were really the same. 
Genus Heterometra A. H. Clark. 
Heterometra 1909. A. H. Clark, Proc. Biol. Soc. Wash., Vol. 22, p. 11. 
Heterometra quinduplicava (P. H. Carpenter). 
Antedon quinduplicava 1888. P. H. SEN BESS Challenger” Reports, 
Vol. 26, Zoology, p. 262, pl. XLVII, figs. 4. 
Heterometra quinduplicava 1909. A. H. lse Proc. Biol. Soc. Wash., 
NL 22, POTE 
Singapore, April 16, 1907. Two specimens, with arms 
about 60 mm. long; one has twenty-one arms, due to the presence 
of six IIBr series, all 4 (3 + 4), and five IIIBr series of 2, all 
developed internally in 1, 2, 2, 1 order; the other is similar. 
These specimens agree in every way with others at hand from 
the Philippine Islands, where the type was obtained. Pr, though 
larger than usual in this genus, is, nevertheless, somewhat smaller 
than P,. 
Heterometra aspera sp. nov. 
Centro-dorsal moderately thick, discoidal, the bare polar area 
slightly convex, 3 mm. in diameter, with a more or less pitted 
surface. 
Cirri XVII, 26—31, 17 mm. to 22 mm. long, moderately 
slender; first joint short, the following gradually increasing in 
length to the fifth or seventh, which is squarish; following joints 
similar, or slightly longer than broad, after about the twelfth or 
