A MONOGRAPH OF THE EXISTING CRINOIDS 459 



(Taiwnn) southward to the Sahul Bank, south of western Tunor. 



Bathymetrical range. — From 64 to 185 (?210) meters. The depth records from 

 Dr. Bock's stations represent the length of line out, not the actual depth. 



History.- — In 1893 Prof. F. Jeffrey Bell recorded some specimens from the Sahul 

 Banlv under the name of Antedon longieirra one of which represented this species. 



The species was originally described as Antedon anthus in 1907 from a specimen 

 from Albatross station 4936 off southwestern Japan. Later in the same year it was 

 assigned to the new genus PtUometra, and in 1908 it was placed in the genus 

 Aster ometra. 



In 1908 I described Asterometra lepida from a specimen from the Straits of 

 Formosa in 35 fathoms in the Copenhagen Museum, and in 1909 I described Astero- 

 metra acerba from a specimen from the Sahul Bank south of Timor that had pre- 

 viously been recorded by Bell under the name of Antedon longieirra. 



In 1922 Prof. Torsten Gisl^n recorded and gave notes on 54 specimens from the 

 Bonin Islands that had been collected by Dr. Sixten Bock dming the course of his 

 expedition to Japan in 1914, and at the same time discussed the species in great 

 detail. Under Asterometra anthvs he placed as synonyms my Asterometra lepida 

 and A. acerba. In 1927 Professor Gislen recorded and gave notes on 14 specimens 

 that had been collected by Dr. Th. Mortensen off southwestern Japan in^l914 and 

 further discussed the species. 



ASTEROMETRA sp. 



AsleTomelra sp., juv., Gislen, Vid. Medd. Dansk Naturh. Foren., vol. 83, 1927, p. 43 (Mortensen's 

 station 9; notes), p. 68 (listed). 



Locality. — Dr. Th. Mortensen's Pacific Expedition 1914-'16, station 9; the 

 coral bank, Goto Islands, off southwestern Japan (lat. 32°15' N., long. 128°12' E.); 

 162 meters; hard bottom; May 15, 1914 [Gislen, 1927]. 



Remarks. — Professor Gislen recorded from Mortensen's station 9 three undeter- 

 mined specimens with the following characters. (1) The cirri are XIII, 37-51, 

 17-28 mm. long; the 10 arms are 27 mm. long; the radials are half again as broad as 

 long and, like the ossicles of the IBr series, have a middorsal carination;*P, is 2.3 

 mm. long with 8 segments; Pj is 2.9 nmi. long with 7 segments; P3 is 2.8 nmi. long 

 with 6 segments. (2) The cirri have 36-42 segments and are 14-20 mm. long; the 

 10 arms are 27 mm. long; the ossicles of the IBr series are carinate. (3) The cirri 

 are 19+ mm. long; the 10 arms are 20+ mm. long; P, is 2.5 nmi. long with 9 

 segments. 



Professor Gisldn said that usually the tubercle on the dorsal side of the radials 

 is developed in Asterometra anthus, but in some cases it may be lacking. None of 

 the specimens of A. anthus show carination of the ossicles of the IBr series. The 

 five tubercles on the dorsal pole of the centrodorsal wliich he in his memoir of 1922 

 considered as distinctive of A. macropoda do also sometimes occur in the specimens 

 of A. anthus from Mortensen's station 9, and may be lacking in specimens of A. 

 macropoda. 



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