A MONOGRAPH OF THE EXISTING CRINOIDS 333 



Tonga and Fiji in the British Museum, which were recorded in 1913 as A. papuensis. 



In 1918 I transferred schlegelii from the genus Amphimetra to Heterometra, insert- 

 ing it in a key to the species of the latter genus in the Siboga report. 



Dr. Torsten Gislen said in 1919 that Amphimetra schlegelii, though nearly related 

 to A. milberti, is probably a good species because of the large number of pinnulars 

 combined with small arms. He had evidently overlooked my resolution of the species 

 as originally described into its two components in 1912. 



HETEROMETRA FLORA (A. H. Clark) 



Anledon laevissima BELL, in Gardiner, Fauna and Geography of the Maldive and Laccadive Archi- 

 pelagoes, vol. 1, pt. 3, 1902, p. 224 (Mulan, Maldives). 



Amphimetra flora A. H. CLARK, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 23 (published 

 reference to specimens in the B. M.; Mulan, Maldives; characters). 



Heterometra flora A. H. CLARK, Unstalked crinoids of the Siboga-V\ped., 1918, p. 77 (in key; range). 

 GISLEN, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 22. A. H. CLABK, 

 John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 1936, p. 99 (range), p. 103. GISL&N, 

 Kungl. Svenska Vet.-Akad. Handl., ser. 3, vol. 17, No. 2, 1938, p. 12 (relation to. H. africana 

 var. delagoac). 



Diagnostic features. There are no IIIBr series. The brachials are very short 

 and those in the proximal portion of the arms are unmodified. The cirri are stout 

 and strongly curved, about 20 mm. in length, and are composed of 29-30 segments, 

 all of which are much broader than long, the longest being about one-third again as 

 broad as long. The 10-13 arms are 170-180 mm. long. 



Description. The cirri are about XV, 29-30, stout and strongly curved, about 

 20 mm. in length. All the segments are subequal, all broader than long, the longest 

 being about one-third again as broad as long. The tenth or eleventh and following 

 bear prominent and sharp dorsal spines. 



The 10-13 arms are 170 to 180 mm. in length. 



The longest proximal pinnules are about 20 mm. long and rather slender. The 

 distal ends of their component segments are perfectly smooth. The basal segments 

 are strongly carinate. 



Notes. In the type specimen the cirri are XV, 30. The 12 arms are 170 mm. long. 

 Another specimen similar to the preceding has 10 arms 180 mm. long. A third speci- 

 men, rather smaller than the two others, has 13 arms. There are 29-30 cirrus seg- 

 ments, of which the tenth or eleventh and following bear dorsal spines. The proximal 

 pinnules are rather more strongly carinate than they are in the other two. 



Locality. Mulan, Maldive Archipelago; J. Stanley Gardiner [Bell, 1902; A. H. 

 Clark, 1913, 1918] (3, B. M.). 



History. The three known specimens of this species were first recorded under the 

 name of Antedon laevissima by Prof. F. Jeffrey Bell in 1902. In 1913 I described this 

 form as Amphimetra flora, transferring it to the genus Heterometra in 1918, when it was 

 inserted in the key to the species of that genus in the Siboga report. 



It was not mentioned in my memoir on the crinoids of the Indian Ocean published 

 in 1912 for the reason that at the time the manuscript of that volume was completed 

 I had come to no definite conclusion regarding its status. 



