141 



c 1 cirri longer than the arms, composed of 100 — 120 segments; an 

 indistinct narrow line sometimes traceable on the elements of the 

 IBr series and the first two brachials indicates an incipient median 



keel (southwesternjapan) macropoda 



c 3 cirri about three fourths as long as the arms, composed of 80 — go 

 segments ; arms 80 mm. long 



cl 1 distal pinnules 9 mm. long, with the outer segments not more 

 than twice as long as broad ; overlapping spines on the outer 

 brachials long, strongly curved, and sharp pointed; a rounded 

 median tubercle on the radials; central portion of the elements 

 of the IBr series and first two brachials swollen, but with no 

 indication of a median line (southwestern Japan) . . . anthus 

 d 2 distal pinnules 13 mm. long, with the outer segments three 

 times as long as broad, or even longer; overlapping spines on 

 the outer brachials short, not much curved, more or less blunt ; 

 radials with a dorsoventrally elongate tubercle; IBr series with 



a faint low median carination (Sahul Bank) acerba 



a 2 Elements of the IBr series and first two brachials with prominent median keels 

 or tubercles 



b 1 elements of the IBr series and first two brachials with a very high and 

 continuous narrow median keel 



c 1 the keels on the elements of the IBr series and first two brachials 

 are strongly convex in profile view, so that the outline of the lower 

 part of the animal is formed by a series of convex scallops (Sahul 



Bank to Ti mor and the Kei 'Islands) mirifica 



c 2 the crest of the keels on the elements of the IBr series and first 

 two brachials is straight, parallel with the longitudinal axis of the 

 segments; cirri XX, 77 — 86, 60 mm. to 65 mm. long; arms 100 mm. 



long (Philippine Islands) iris fata 



b 2 the IBr, bears a slightly elongated sharp median tubercle, or a short 

 median ridge; the axillary bears three sharp tubercles; the first two 

 brachials each bear a sharp prominent tubercle; cirri XX, 80, 80 mm. 

 long; arms 100 mm. long (Kei Islands) longicirra 



1. Aster ometra mirifica A. H. Clark. 



Bell. Journ. Linn. Soc. (Zool.), vol. 24, 1893, p. 339 {Antedon longicirra, part). 



A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 146 {Asterometra mirifica). 



Crinoids of the Indian Ocean, 19 12, p. 190, fig 33, p. 192 {Asterometra mirifica). 



Smithsonian Miscellaneous Collections, vol. 61, 1913, N" 15, p. 43 {Asterometra mirifica). 



Stat. 260. 2.3 miles N. 63 VV. from the northern point of Nuhu Jaan, Kei Islands. 90 Metres. 



3 Ex. 

 Stat. 294. io°i2.2S., i24°27'.3E. Timor Sea. 73 Metres. 5 Ex. 



