A MONOGRAPH OF THE EXISTING CRINOIDS 97 



Hartlaub said that Antedon japonica in its general appearance much resembles A. 

 serripinna, and it is possible that a further knowledge of the two forms will later lead 

 to their union. But japonica lacks the feature that induced Carpenter to bestow 

 the name serripinna upon the other, that is, the overlapping of the individual seg- 

 ments of the proximal pinnules, which gives these pinnules a serrate profile. Also, 

 P2 is approximately as large as P 3 whereas in serripinna it is noticeable for its larger 

 size. The cirri of japonica are arranged in two rows on the centrodorsal. 



In my first revision of the old genus Antedon published in 1907, japonica was 

 retained in that genus as therein restricted, but it was transferred to the genus Oligo- 

 metra upon its establishment in 1908. In 1908 I recorded and gave notes on a speci- 

 men identified as Oligometra japonica that had been collected by Mr. Alan Owston 

 in Sagami Bay. This specimen was later described as the type of a new species, 

 Prometra owstoni. In a revision of the family Himerometridae published early in 

 IQQQ japonica was listed as a species of the genus Oligometra. In 1910 I examined the 

 type specimen of Hartlaub's Antedon japonica in the Berlin Museum, and in 1912 

 I published notes upon it. In my memoir on the crinoids of the Indian Ocean pub- 

 lished in 1912 I listed Oligometra japonica and gave the synonymy and the localities 

 from which it is known. The locality Philippine Islands and the depth 58 fathoms 

 refer to Alisometra longipinna, misidentified as Oligometra japonica, and the depth 55 

 fathoms refers to the type specimen of Alisometra owstoni, which was originally mis- 

 identified as 0. japonica. In my report upon the unstalked crinoids of the Siboga 

 expedition published in 1918 I included japonica in the key to the species of Oligometra, 

 giving as the habitat southern Japan. 



In 1927 Dr. Torsten Gislen recorded and gave notes on a specimen that had been 

 dredged by Dr. Theodor Mortensen in Sagami Bay, Japan, in 1914. 



ICONOMETRA ANISA (H. L. Clark) 



PLATE 9, FIGURES 45, 46; PLATE 11, FIGURE 57; PLATE 12, FIGURES 58-61 



Oligomelra anisa H. L. CLARK, Carnegie Inst. Washington Publ. 212, 1915, p. 105 (description; 

 Maer). A. H. CLARK, Unstalked crinoids of the Siboga-Exped., 1918, p. 126 (in synonymy of 

 Oligometrides adeonae). H. L. CLARK, The echinoderm fauna of Torres Strait, 1921, p. 23 

 (notes and comments), pi. 1. fig. 10 (colored), pi. 4, figs. 1, 3 (colored), pi. 21, figs. 1-3, pi. 36, 

 figs. la-e. 



Oligometrides adeonae (part) A. H. CLARK, Unstalked crinoids of the Si'&offa-Exped., 1918, p. 126. 



Iconometra anisa A. H. CLARK, Journ. Linn. Soc. (Zool.), vol. 36, No. 249, 1929, p. 643 (listed). 

 H. L. CLARK, Great Barrier Reef Exped., 1928-29, Scientific Reports, vol. 4, No. 7, 1932, p. 

 202 (Magnela station xix); Echinoderm fauna of Australia, 1946, p. 49 (notes). 



Diagnostic features. The cirri have 15-19 segments and are 10-12 mm. long; the 

 transverse ridges are proximal becoming median distally, or sometimes proximal with 

 a small distal one; P 2 is longer and somewhat stouter than P 3 ; the 10 arms are 45-65 

 mm. long. 



Description. The centrodorsal is thin-discoidal with about 15 well-separated 

 small conical papillae on the flat dorsal pole. The cirrus sockets are arranged in one 

 and a partial second crowded marginal rows. 



The cirri are XVI, 18-19, about 10 mm. long. In the most developed cirri the 

 segments beyond the first two are subequal, all about as long as broad, and in lateral 

 view the cirri are of uniform width throughout. On the third or fourth segment the 



