A MONOGRAPH OF THE EXISTING CRINOIDS 387 



proximal border strongly inclined. The terminal claw, if uninjured, is slightly longer 

 than the penultimate segment, rather slender and moderately curved. 



The radials are visible as narrow bands beyond the concave radial regions of the 

 centrodorsal. Intcrradially they are extended upward by a narrowly spatulate 

 process, which extends as far as the lateral angles of the IBr axillaries which meet 

 above it. Basally it is almost or quite concealed by the very close approximation 

 of the proximal angles of the IBrj. 



The IBr, are very short, from 4 to 6 times as broad as long, with slightly converg- 

 ing sides. The lateral angles are very nearly or quite in apposition. The distal 

 border is nearly straight, but curves slightly upward laterally to the somewhat pro- 

 duced and sharply rounded anterolateral angles. The IBrj (axillaries) are low, short, 

 twice as broad as long or even broader. Ventrally they are strongly produced laterally 

 into a triangular process, the apices of the triangles of adjacent IBr^ just meeting 

 over the anterior production of the radials; the distal border of the triangular processes 

 runs from the lateral apex diagonally upward to near the distal end of the outer side 

 of the first brachial so that the first brachials are both proximally and exteriorly 

 bounded by the axillaries. The distal borders of the axillaries are prominently 

 everted, but not spinous. 



The 12 arms are 95 nrni. in length. The IIBr series are 2. The first brachials 

 are small and short, somewhat more than twice as broad as the median length; the 

 outer border is almost parallel with the axis of the IBr series and is slightly concave, 

 the deepest part of the concavity being near the distal end. The inner borders of 

 adjacent first brachials are in apposition in the proximal two-thirds, the distal thirds 

 diverging in almost a straight line. The proximal edge, and the distal edge except 

 in the middle, are more or less everted, but not spinous. The second brachials except 

 at the base are produced outward on the outer side so as to form an attachment for 

 the enormously enlarged first segment of Pi. The lateral edge of this production 

 runs from a point far beyond the anterolateral angle of the first brachial upward and 

 slightly inward to the somewhat produced anterolateral angle of the second brachial. 

 The inner border of the second brachials is very short and concave. The distal 

 border is approxunately parallel with the rim of the centrodorsal, and consequently 

 very oblique; it is somewhat everted. The first syzygial pair (composed of brachials 

 3 + 4) is wedge-shaped, twice as long interiorly as exteriorly and twice as broad as 

 the median length. The sides of the two components, the hypozygal and the epizygal. 

 form approximately right angles with each other on either side. The distal border is 

 rather strongly everted. The following brachials are wedge-shaped, almost triangular, 

 twice as broad as the median length, after about the thirteenth becoming triangular, 

 about as long as broad, and after about the end of the proximal third of the arm wedge- 

 shaped again and slightly shorter. The terminal brachials are about as long as broad 

 and obliquely wedge-shaped. On about the tenth brnoliial the middorsal region 

 becomes broadly swollen; this soon narrows into a broadly rounded eminence lying on 

 succeeding brachials on either side of the median line, and in the outer half of the arm 

 it becomes a very blunt and inconspicuous median carination. All the brachials 

 have everted but smooth ends, giving the arms a very rough appearance. 



Pi is 6 mm. long and is composed of 20 segments. The first segment is enormously 

 enlarged, extending from the proximal end of the pinnule socket on the second brachial 



