179 
Off Nipon, Japan. The type. 
Genus Oligometra A. H. Clark. 
Oligometra 1908. A.H. Clark, Proc. Biol. Soc. Washington, Vol. 21, p. 216. 
Oligometra serripinna (P. H. Carpenter). 
Antedon cupulifera Litken, M. S. 
Antedon serripinna 1881. P. H. Carpenter, Notes from the Leyden 
Museum, Vol. 3, p. 182. 1891. Hartlaub, Nova Acta Acad. German., 
Vol: a8. No: 1 9: 82. 
Oligometra serripinna 1908. A. H. Clark, Proc. Biol. Soc. Washington, 
Vol. "21, p. 126: 
Oligometra pulchella 1908. A. H. Clark, idem., Vol. 21, p. 226. 
Singapore, June 4, 1903. Eight specimens; six of these 
resemble the type of O. pulchella; one is small, with arms 40 mm. 
long, but otherwise similar to the type, and one is young, with arms 
13 mm. long, cirri LX, 8—10, 3 mm. long. In the last the lower 
pinnule joints are elongate, and do not exhibit the distally serrate 
condition so characteristic of the adults. 
June 17, 1904. One specimen. 
April 20, 1906. Four specimens. 
April 16, 1907. Twenty specimens, twelve of which are 
large, resembling the type, and eight are small; eight of the 
specimens, seven large and one small, were attached to a small 
sprig of gorgonia. 
July 22, 1907. Three specimens. 
November 27, 1907. Twenty-three specimens. 
January 9, 1908. One specimen. 
Oligometra serripinna is a species of very delicate build, 
with long and slender arms, resembling superficially O. gracilicirra 
from the Philippine Islands and O. imbricata from Tranquebar; 
but the very short and very stout lower pinnules of the former 
with their spinous distal ends, recalling those of Himerometra 
crassipinna, as well as the much greater number of the cirrus 
joints, distinguish it at once, while the strong imbrication of the 
brachials of the latter, the more numerous cirrus joints, and the 
smoother proximal pinnules are sufficient to differentiate it. 
12" 
