A MONOGRAPH OF THE EXISTING CRINOIDS 67 



the median carination, the other branch running as a thickened rim along the distal 

 faces of the axillary, or as a ridge just within the distal edges, sometimes meeting just 

 proximal to the distal apex, though usually forming a broad curve beyond which is he 

 apex The IIBr series are 2. The proximal and distal edges of the elements of the 

 IIBr' series are moderately thickened and everted; there is a slight rounded median 

 carination; the axillaries have thickened distal edges and produced proximal edges he 

 latter running in a broad curve in the central part of the segment, in the lateral thud 

 or fourth running nearly or quite straight to the lateral angle. 



The edges of the first two brachials are modified like those of the elements of the 

 IIBr series; there is a trace of a median carination. 



Pl is 10-12 mm. long with 17-21 segments which, at first short, become about as 

 long as broad on the sixth, and nearly twice as long as broad terminally The pinnule 

 s evenly tapering, rather strongly prismatic, and but little enlarged; the second-fifth 

 segments are sharp distally, though not distinctly carinate; the outer segment , ha™ the 

 distal angles rather prominent, though not produced. P 2 is 6.5 nuoJ '»» ^ ^ 

 segments shorter, more slender, and slightly less tapering than P, The pinnule is 

 s fongly ^nd sharply prismatic, the profile of the prismatic angle on the outer segments 

 b in" slightly convex; the distal segments have slightly prominent distal angles. P 3 

 is 6 mm long with 12 segments, similar to P 2 but tapering slightly more rapidly dis- 

 tally The following pinnules resemble P, The distal pinnules are slender, 9 mm. long 



With ALj: -Cpreceding description is based upon the specimen from Siboga station 

 302 Cpenter's original description, based upon two specimens from Chalenger 

 Station 192 an d one from Challenger station 201 (the last representing P. granulata) was 



88 Ventrodorsal is a thick convex plate with the dorsal pole free. 



The cirri are XV-XX, about 20; a few of the segments are longer than wide, and 

 the latter are somewhat compressed laterally with blunt dorsal spines 



The radials, and sometimes parts of the IBr„ are concealed. T ^™^^™ 

 and sharply convex with a slight median ridge, and they meet one another lateral y 

 bet 1 the angles of the cenUlorsal. The IBr 2 (axillaries) are short and widely 

 rhomb c also with a median ridge, and forming a small tubercle with the preceding 

 rhombic, aiso ^.^ ^ axillanes are short and 



"^M^SZSS^ of the IBr axillaries, the elements of the I Br series 

 Inn the Zt two brachials are slightly flattened, and the inner sides of the second 

 brachials and the first syzygial pahs are also somewnat flattened. 



The 15-*0 arms are 140 mm. long and are composed of 150 o, more .brachials, 



of which the k.west are nearly oblong with indications of a dorsal keel and raised -distal 



ed'e and th^e followliig are more triangular and distinctly carinate, gradually be- 



oSng TuaTate and somewhat compressed laterally, with a ^dency^ overi^ 



Syzygies occur between brachials 3+4, again from between bra . 2+13 



to between brachials 13+14, and distally at intervals of from 3 to 8 (u.unlh 



^ P^ Si long with about IB short segments the first ^^ 

 much wider than their successors and shghtly pr^aU. ^"jJ^J *£ j 

 segments more rounded and not so wide. The iollowin,, pinnuics 



