OF THE LEYDEN MUSEUM. 189 
segments, appears to separate this form sharply from C. 
vepretum, and to place it in the diadema-group of species. 
Oligometra serripinna (P. H. Carpenter). 
Antedon serripinna 1881. P. H. Carrenter, Notes from 
the Leyden Museum, vol. 3, p. 182. 
Oligometra serripinna 1908, A. H. Crark, Proce. Biol. Soc. 
Washington, vol. 21, p. 126. — 1909. Vidensk. Medd. 
fra den naturhist. Forening i Kjgbenhavn, 1909, p. 179. 
Oligometra pulchella 1908. A. H. Crark, Proc. Biol. Soc. 
Washington, vol. 21, p. 226. 
Andai: New Guinea. — The type specimen of this 
species fits closely the description of the form which I 
called pulchella; the projection of the distal ends of the 
lower pinnule segments is not greatly accentuated. The 
purple bands on the arms are very narrow. 
Tropiometra sp. 
Indian Ocean, — The cirri are XV, 18—22, com- 
paratively weak and slender, as in the specimens labeled 
»South Pacific” in the U.S. National Museum; the cirrus- 
segments are all subequal, all slightly broader than long, 
the last four tapering slightly; the brachial carination is 
moderate, as in the »South Pacific’ specimens. 
This specimen appears to belong to an undescribed 
species which occurs westward from the Indian Ocean to 
the South Sea Islands; it is characterized by having the 
cirri small and weak, though otherwise as in 7. picta of 
the West Indies and Brazil. The cirri of the two other 
Indian Ocean species, T. carinata and T. encrinus, are stout 
and large, especially in the first named, which has the 
largest cirri of any of the smaller species of the genus; 
the cirri of 7. carinata are easily distinguished by their 
very short segments. I have not as yet been able to 
examine a sufficient number of specimens of this animal to 
Notes from the Leyden Museum, Vol. XX XIII. 
