230 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



in the Gulf of Manaar under Prof. Sir William Herdman, and also from off Trinco- 

 malee. He gaves notes on these specimens, compared them with others, and figured 

 the base of an arm with the first four pinnules and a cirrus. 



In my first revision of the old genus Antedon published in 1907, I retained serri- 

 pinna in Antedon as therein restricted. But in 1908 I made serripinna the type of 

 my new genus Oligometra. Later in 1908 I described Oligometra pulchella from 

 some specimens from Singapore collected by Svend Gad that had been sent to me 

 for study by the Copenhagen Museum through the courtesy of Dr. Th. Mortensen. 

 On December 23, 1908, in a paper on the first consignment of crinoids received from 

 the United States Bureau of Fisheries steamer Albatross, at that time engaged in 

 work among the Philippine Islands, I recorded Oligometra pulchella from station 

 5139, and noted that this species was previously known only from Singapore. 



Both pulchella and serripinna were listed as species of Oligometra in my revision 

 of the family Himerometridae published early in 1909. Later in 1909 in a paper on 

 the crinoids of the Copenhagen Museum I recorded and gave notes on 60 specimens 

 of Oligometra serripinna from Singapore that had been collected by Svend Gad. In 

 the synonymy of this species I included Antedon cupulijera Liitken, MS. (in reality 

 0. caledoniae from the Tonga Islands) and Oligometra pulchella. I said that 0. 

 serripinna was found in the Philippine Islands by the Albatross and occurs abundantly 

 along the Indian coast to Ceylon, having been recorded also from the Red Sea. The 

 Red Sea record is from Chadwick and was based upon specimens of Decametra chad- 

 wicki (see page 176). I remarked that I had at first thought that the specimens from 

 Singapore represented a distinct species because of the rounded processes on the 

 distal ends of the segments of the lower pinnules, these being large spines in serri- 

 pinna; but the examination of a large amount of additional material showed that this 

 is a character of great variability and that the form I had called pulchella is in reality 

 nothing more than a strongly marked variety, imperceptibly grading into true 

 serripinna and occurring with it throughout its range. 



In a paper on a second consignment of crinoids received from the Albatross 

 published in 1909 I recorded a small mutilated specimen of Oligometra pulchella from 

 station 5248. In a paper on the recent crinoids of the coasts of Africa published in 

 1911 I included Oligometra serripinna in the list of species found on the southeastern 

 coast from Mombasa to Cape Town, including all the outlying islands; but in the 

 discussion of the species the form from Mauritius and Cargados Carajos was described 

 as a new variety, occidentalis. In a paper on the crinoids of the Leyden Museum 

 published in 1911 I gave notes on the type specimen of Oligometra serripinna, and in 

 a paper on the crinoids of the Paris Museum published in the same year I compared 

 it with my new 0. caledoniae. In a paper on the crinoids of the Hamburg Museum 

 published in 1912 I discussed the variations in Oligometra serripinna. The specimens 

 described under that name from the Tonga Islands are in reality 0. caledoniae, and 

 that from Fuchow is 0. chinensis. In 1912 I compared the arms of 0. serripinna 

 with those of my new species 0. (Prometra) intermedia. I also recorded and gave 

 notes on a specimen from Investigator station 95, and recorded a small and immature 

 specimen from the Arrakan coast of Burma. 



In my memoir on the crinoids of the Indian Ocean published in 1912 I recorded 

 and gave notes on specimens of Oligometra serripinna from the Pedro shoal; from off 



