A MONOGRAPH OF THE EXISTING CRINOIDS 



545 



angle being approximately a right angle. The radials and the elements of the IBr 

 series are smooth. 



The 10 arms are 25 mm. long with about 60 brachials. The first brachial is short, 

 with a longer exterior than interior edge, and is slightly incised by the second, which is 

 a little broader than long with a broadly rounded posterior projection and a concave 

 distal edge; both these brachials are smooth. The interior edge of the first syzygial 

 pair (composed of brachials 3 + 4) is considerabh'- longer than the exterior. The 

 brachials between the first and second syzygy are slightly broader than long. The 

 fifth brachial is rectangular with its interior proximal corner produced downward. 

 The following brachials are similar with the exterior and interior proximal corners 

 produced downward alternately. They gradually change in shape so as to be wedge- 

 shaped at the second syzygy. Beyond the second syzygy the brachials are triangular, 

 a little longer than broad. Farther out on the arm they become quadrangular, with 

 oblique proxunal and distal edges, and more elongate. The distal edges of all the 

 brachials beyond the first syzygy are everted and rough with spines. 



Syzygies occur between brachials 3+4, 9 + 10, and 14+15, and distally at intervals 

 of from 2 to 4 (usually 3) muscular articulations. The length from IBrj to the second 

 syzygy is 6.0 mm. and the width at the first syzygy is 0.85 mm. 



Pi is longer and much more massive than P2, reaching to the tip of the latter, 4 mm. 

 long, with 14 segments, which are strong and rounded and a little longer than broad; 



Figure 30. — Eumorphometra m<jrri John, holotype: a, Lateral view; b, proximal part of Pi; c, Pj; 

 d, P,; e, cirrus. E. aurora John, holotype: /, lateral view; g, proximal part of Pi; A, Pj. 



