88 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



is 3.5 mm. long with 10 segments. The pinnules following slowly increase in length, 

 the distal pinnules being 6 mm. long with 16 segments most of which are about twice 

 as long as broad. 



Localities. Albatross station 2146; off Colon, Canal Zone Gat. 932'00" N., 

 long. 7954'30" W.); 62'Veters; broken shells; April 2, 1884 [A. H. Clark, 1908, 

 1909, 1911, 1923] (1, U.S.N.M., 22676). 



Caroline station 78; north of Puerto' Rico (lat. 1829'42" N., long. 6531'15" 

 W.); 320 meters of wire out; February 25, 1933 (18, U.S.N.M.). 



Between St. Thomas and St. John, Virgin Islands; 27-36 meters; Th. Mortensen, 

 December 23, 1905 (1, C. M.). 



No locality [Hartlaub, 1912]. 



Geographical range. Caribbean Sea; from the Virgin Islands and north of Puerto 

 Rico to off Col6n, Canal Zone. 



Bathymetrical range. From 62 meters downward to an undetermined depth. 



History. In the Challenger report on the comatulids published in 1888 Dr. P. H. 

 Carpenter mentioned Antedon armata as among the 10-armed species of the Blake 

 collection, and gave as the habitat Florida Straits in 35 fathoms. The habitat as 

 given is the locality and depth at which the type specimen of armata was taken; 

 but this was dredged by the Bibb and not by the Blake. After Carpenter's death 

 Hartlaub found three specimens that had been sent him with the Blake collection. 

 One was presumably, though not certainly, the type of Pourtales's Antedon armata 

 from the. Bibb coUection, one was an example of caribbea, and one was a small armata. 

 It is probable, therefore, that Carpenter did not distinguish caribbea from armata, but 

 included both under the latter name. 



On the establishment of the genus Oligometra in my paper published on April 1 1 , 

 1908, Oligometra caribbea A. H. Clark was given without comment in the list of 

 included species. The description of this species appeared in another paper published 

 on May 14 of the same year. The species was based upon a single broken specimen 

 that had been dredged by the Albatross at station 2146. In a paper published in 

 1909 I compared Oligometra caribbea with my new species 0. studeri. In my memoir 

 on the crinoids of Australia published in 1911 I remarked that Oligometra (Austro- 

 metra) thetidis is curiously similar to Analcidometra caribbea from the Caribbean Sea. 



In 1912 Dr. Clemens Hartlaub redescribed Pourtales's Antedon armata from 

 three specimens, two large and one very small, that had been sent him with the 

 Blake collection. His figures show that one of the larger specimens was an example 

 of A. caribbea. 



In a list of the crinoids of the Atlantic Ocean published in 1923 I included Anal- 

 cidometra armata giving as the range from the Bahamas and Dry Tortugas to Barbados 

 and Colon in 5.5-64 meters. The locality Colon refers to the type specimen of 

 A. caribbea, which at that time was regarded as a synonym of armata. 



Genus ICONOMETRA A. H. Clark 



Antedon (part) HABTLAUB, Nachr. Ges. Gottingen. May 1890, p. 172, and following authors. 



Oligometra (part) A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 126; vol. 22, 1909, p. 

 7; Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 28; Proc. U. S. Nat. Mus., vol. 43, 1912, pp. 

 384, 400; Crinoids of the Indian Ocean, 1912, pp. 37, 175. H. L. CLARK, Carnegie Inst. Wash- 

 ington Publ. 212, 1915, p. 105. A. H. CLARK, Journ. Washington Acad. Sci., vol 5, No. 6, 



