150 
April 20, 1906. Two medium sized specimens, each with 
ten arms. 
April 16, 1907. Seven specimens, six with ten, one with 
eleven arms; the largest has arms 110 mm. long, not enlarged 
proximally, cirri XIII, 10—12; another, of about the same size, 
is similar, but has eleven arms; three of the specimens are very 
small, one having arms only 9 mm. long. 
November 27, 1907. Twenty-six specimens, three of which 
have eleven arms, the remainder ten; the larger specimens have 
arms 125 mm. to 140 mm. long; one eleven armed specimen has 
arms only 80 mm. long. 
January 9, 1908. Twenty-seven specimens. 
I have never found the IIBr series in this species to be 
other than 2 (1—+ 2). Although examples with eleven or twelve 
arms are not rare in Comatula pectinata (in this collection eight 
out of forty-eight, or about 16 7”/0, have more than ten arms), this 
condition has not yet been noticed in C. solaris or C. brachiolata, 
"the other ten-armed species of the genus. 
Genus Cominia A. H. Clark. 
Cominia 1909. A. H. Clark, Proc. U. S. Nat. Mus., Vol. 36, p. 497. 
Cominia decameros (Å. H. Clark). 
Comanthus decameros 1908. A. H. Clark, Proc. Biol. Soc. Wash., Vol. 
2E p: 221; 
Off the Goto Islands, near Nagasaki, Japan; 329 
29' N. lat., 1289 42' E. long.; 170 fathoms. The type. In 
its long and comparatively slender cirri and rugged arm bases 
this species presents a most remarkable superficial . similarity 10 
species of the Antedonid genus Heliometra. Its long cirri with 
comparatively numerous joints render it very readily distinguishable 
from Comactinia meridionalis, C. echinoptera, and the other species 
of that genus, all of which have very short and stout cirri, with 
few joints, and in their general appearance resemble to a striking 
degree Antedon petasus and A. bifida. The presence of a synar- 
