NO. IO CRINOIDS OF HAMBURG MUSEUM — CLARK 3I 



EUANTEDON, new genus 



Centrodorsal low hemispherical, resembling that of Antedon medi- 

 terranea or A. adriatica, bearing- about thirty cirri. 



Cirri long, rather slender, all the segments longer than broad, the 

 earlier two to four times as long as broad, the outer slightly longer 

 than broad ; in general resembling those of the Mediterranean species 

 of Antedon. 



Arm structure as in the Mediterranean species of Antedon; syn- 

 arthrial tubercles may be moderately developed. 



P 1 slender with less than twenty-five segments, shorter than the 

 cirri, somewhat stiffened; all the segments except the basal are 

 elongated ; P„ about half as long as P 1} but longer than P.., resembling 



Pi- 



Genotype. — Antedon moluccana A. H. Clark, 1912. 



Euantedon differs from Antedon in having P 2 resembling P a and 

 intermediate in size between P a and P., ; and in having P x composed of 

 much longer segments than the corresponding pinnule in Antedon. 

 It differs from Mastigometra in having Pj shorter than instead of 

 much longer than the cirri, stiffened instead of flagellate, and com- 

 posed of fewer segments. 



EUANTEDON SINENSIS, new species 



I. ? Coast of China (labeled, in Chinese characters, "very deep 

 water "). — One specimen, which may be described as follows: 



Cirri about XXX, 15-17, the longest probably 13 mm. to 15 mm. 

 long; the longest segments in the proximal portion are from two to 

 two and one-half times as long as broad ; the outer segments are only 

 very slightly shorter; the cirri resemble those of Antedon adriatica in 

 general appearance ; the dorsal proximal and distal edges of the seg- 

 ments are slightly thickened in the outer segments as in Antedon 

 mediterranea -and in . /. adriatica. 



The arm structure resembles that of A. adriatica; the distal inter- 

 syzygial interval is three oblique muscular articulations. The arms 

 are about 60 mm. long. 



Pj is broken in all cases ; but it is longer and stouter than P 2 ; the 

 first segment is short, the second slightly longer than broad, the third 

 slightly over twice as long as broad, and the following about three 

 times as long as broad; the distal edges of the third and following 

 segments are slightly produced; P 2 is from 6 mm. to 6.5 mm. long 

 with nine or ten segments of which the second is about as long as 

 broad, the third nearly twice as long as broad, and the following 

 increase in length so that the outer are about four times as long as 



