314 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



tion). HAMANN, Bronns Klassen und Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 1907, p. 1582 

 (listed). A. H. CLARK, Crinoids of the Indian Ocean, 1912, pp. 35, 110 (identity of records); 

 Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 86 (same). 



Himerometra philiberti A. H. CLARK, Smithsonian Misc. Coll., vol. 50, 1907, p. 356 (listed); Proc. 

 Biol. Soc. Washington, vol. 22, 1909, p. 7 (listed). 



Amphimetra morlenseni A. H. CLARK, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 635 (description; Port 

 Blair, Andamans); Bull. Mus. Hist. Nat., Paris, 1911, No. 4, p. 250 (synonym of philiberti); 

 Crinoids of the Indian Ocean, 1912, p. 107 (same); Unstalked crinoids of the Siboga-Exped., 

 1918, p. 77, footnote 2 (same). 



Amphimetra philiberti A. H. CLARK, Proc. U. S. Nat. Mus., vol. 40, 1911, p. 21 (nearest relative of 

 Amphimetra [Heterometra] africana; differential characters); Bull. Mus. Hist. Nat., Paris, 1911, 

 No. 4, p. 245 (=Comatula philiberti J. Miiller), p. 250 (Java; detailed description of the type; 

 includes mortenseni) ; Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 13 (Kwala Cassan, 

 Malay peninsula; description of specimens), pp. 14, 15 (compared with Amphimetra schlegelii); 

 Proc. U. S. Nat. Mus., vol. 43, 1912, p. 393 (compared with Amphimetra [Heterometra] africana); 

 Crinoids of the Indian Ocean, 1912, pp. 30, 35 (identity), p. 107 (synonymy; detailed descrip- 

 tion; localities; notes on the type specimen), p. 316 (Andamans), fig. 7, p. 108. 



Heterometra philiberti A. H. CLARK, Unstalked crinoids of the Siboga-Exped., 1918, p. 77 (in key; 

 range). GISL&N, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 28. 



Diagnostic features . The very short discoidal bracliials in the outer half of the 

 arms combined with the presence of IIIBr series all, most, or at least some of which 

 are 4(3+4), and the more or less swollen elements of the division series and earlier 

 brachials easily distinguish this species. 



The cirri have 26-45 (usually about 35) segments of which the longest are nearly 

 as long as broad. There are 18-27 arms 80-150 mm. long. 



Description. The centrodorsal is thick discoidal, with the bare polar area flat, 

 4 or 5 mm. in diameter. The cirrus sockets are arranged in two closely crowded 

 alternating marginal rows. 



The cirri are XVIII-XX, 30-42 (usually about 35), 25 to 30 mm. long. The 

 first segment is short, about three times as broad as long, the second and third are 

 about twice as broad as long, and those following gradually increase in length to the 

 ninth or tenth, which is nearly, though never quite, as long as broad. The next 

 five or seven segments are similar; those following gradually decrease in length so 

 that those hi almost the whole of the terminal half of the cirri are about half again as 

 broad as long. From the twelfth or fourteenth segment onward sharp median 

 tubercles or small spines are developed on the dorsal side, those on the last few seg- 

 ments occupying a position slightly proximal to median. The opposing spine is 

 much larger than the processes on the preceding segments, triangular, the apex 

 median, arising from very nearly the whole dorsal surface of the penultimate segment, 

 equal to about half the width of that segment in height. The terminal claw is longer 

 than the penultimate segment, moderately stout basally, but gradually becoming 

 slender distally, and is moderately curved. 



The radials are concealed, or just visible beyond the run of the centrodorsal. 

 The IBri are oblong, very short, in close lateral apposition. The IBr 2 (axillaries) are 

 very broadly pentagonal, almost triangular, the lateral edges not quite so long as 

 those of the IBr I( about two and one-half tunes as broad as long. The IIBr series are 

 4(3+4). The IIIBr series are 4(3+4). The division series and first two brachials 

 are in close lateral apposition and laterally flattened against their neighbors, the dorsal 



