24 TORSTEN GISLÉX, CRINOIDS. 



the length l U of the breadth. Opposing spine usually a little stronger than the 

 dorsal spines of the preceding segments. Terminal claw curved, at least as long as 

 the pennltimate segment. The length of the C:i 25 — 30 mm. 



The arms are XXIII, XXIV and XXX resp., 8o — 100 mm, closely presscd 

 against each other, but little wall-sided. 



The corners of the R-.s project as small, triangular-shaped portions between 

 the fixing places of the C:i and the I Br:s 1. Their surface is strongly granulated 

 (almost completly concealed, however, by Cd in the specimen from Stat. 7). I Br:s 1 

 laterally united. I Br 1 and 2 united by a synarthry, each of thcm with a median 

 tubercle. This points straight upwards on I Br 1, bent backwards on I Br 2, so that 

 the tnbereuli converge into a joint tip. This is repeated in all the pairs of joints 

 united by synarthry. 



The II Br:s are 4 (1 — 2 3 + 4), in exceptional eases 1 — 2 3—4; in the latter case, 

 3 d and 4 th segments being provided with the tnbereuli, described above. In the spe- 

 cimen from St. 7 there are in two eases only 2 (1—2) segments. The III Br:s are 

 2 (1 — 2), united by syzygy a few times (after IIBr3 + 4; or 3 — 4; see the scheme, 

 which is otherwise a typical one). 



r n 1-2 3+4' 



Brl-23+4 12+13. . .20 + 21 



Er 1 -23 + 4 . . . 10+11 . . . 18+1!) 



Ill 1 



l Er 1 2 3 + 4. 15 + 10. . .20 + 27 



IMI-2: 



. 11 + 12 . . .24+25 . . . 



[ Br 1-2 3+4 

 [ I1I1 + 2 



l Brl-23+4 



l] I1 _23+4J l Brl-2 3 + 4 15+10. . .27 + 28. . . 



I Brl-2 3 + 4 13+14. . .20 + 27. . . 



The primipostaxillaries united inside. The syzygies in the division series con- 

 nect a very narrow, discoidal hypozygale and an irregularly triangular-shaped epi- 

 zygale (the axillary). 



The first 10 Br:s discoidal, then wedge-shaped segments. The segments again 

 discoidal in the distal part of the arm. The ossicles of the division series and the 

 proximal part of the arm plump and sw ollen. From Br 7 and 8 dorsal, thick, 

 transverse prominences, developed most strongly on the sides of the segments that 

 carry the P., thus alternating on the right and on the left side. Distal segments 

 collar-shaped. 



Concerning the appearance of the syzygies see the scheme. In the distal parts 

 of the arms they are found at intervals of 12—20 segments. 



Pj (on IIBr2) 21, 6 mm. First segment short. The 2 d — 10 th about as long 

 as b road with prominences directed outwards (against the tip of the arm). Distal 

 segments shorter, with the inner margin provided with low knöts. The whole P 

 compressed and wound a quarter of a turn. P_> at III Br 2 or Br 2, 21, 7 min. 

 very much coarser and stronger. The two first segments tapering towards their 

 basis, somewhat longer than broad. From the 2 d segment a crista, sharply set off, 

 and directed towards the tip of the arm. From the 6 th segment branches the cari- 





