The Crinoids from Dr. S. Bock's P^xpeditiox to Japan 1!»I4. SI 



the proximal ones are longest, L = ^ 4 br. From the 0"' segment a 

 double dorsal spine, which at the 15"'( — 17"') segment becomes a 

 single one. h = ' 4 of the br of the segment. The paired prominences 

 distinct, close to one another, only on the (i*'' — !»"' segment indistinct, 

 almost forming a transverse I'idge. The antepenultimate and the near- 

 est preceding segments with weaker spines. Opposing spine h = ^/g 

 of the br of the segment. Terminal claw coarse, somewhat curved, 

 about as long as the preceding segment. 



R — s narrow bands. I Br I free laterally, h = ' 4 br (br = 0,s mm). 

 I Brax h = ^ /s br, as II Br 2 with a slight synarthrial tubercle. Primi- 

 postaxillaries united inside. II Br — s : 2. No III Br — s. II Br I h = 

 ^/3 — 1/2 X br (narrower on the inner side, broader on the outer side). 

 Arms XIX, 50 mm. smooth. After Br 7 oblique segments. Distal seg- 

 ments triangular with slightly swollen articulations. Syzygies: 3 + 4, 

 15 + 16 or 18+10, distally with an interval of 7—10 (usually 9 — 10) 

 oblique articulations. IX segments per em. (Iti, if the syzygial pairs 

 ai'c counted as units). 



Pj 12: 4 mm. Is occasionally missing on the inner side of a II 

 Biax. P., 14: 7 nmi., outer segments with spiny collars, P, 12; 4..-. mm.. 

 P4 11: 4 mm., P.^ is most often absent, P,, 12; 5,.^ mm., P^. shorter. P.^ 

 and Pi, very much coarser than the other pinnules, longest segments 

 L = 2 br, somewhat angular and spiny. The other pinnules with smooth 

 segments. Distal p. 14 — 17; 4,5— (i mm. Disk thrown off. Colour 

 yellov^' with black-red spots. 



Example of the distribution of pinnules and dixision of arms. 



I 1 



II 



Br 1-2 3 + 456 7 . 

 Br 1—2 3 4 5 + 67 

 Bi' 1—2 3 + 4567 

 Br 1—2 3 + 4 5 6 7 



111 this as in the following species the specimens that are found 

 in the collection have the double prominences of the cirrals not very 

 distinctiv marked. 



Nova Acta Reg. Soc. Sc. Ups.. Ser. 1, Vol. 5. X:o G. Impr. ",3 1922. 



