Thr Crinoids from Dr. S. Bock's Expedition to Japan 1014. 33 



height of the segments = '/2 — V/s X Itr. 13 — 14 segments pr cm. (11, 

 if the syzygial pairs are counted as units). The bi-eadth of the arms 

 pi'oximaliy 3 — 3,^ mm. In ihe middle arm-parts 2 mm. 



P,i + 40 (0— 8Tj 14—17 mm., P,v 32 (5-0 T) 10 mm., P^ and 

 P., decreasing, P3 about 20 (ô T) 5 nun. This, however, not always 

 so decided, but 1\ oi- P3 are most often the shortest. In the posterior 

 arms the pinnules are genitally swollen after Pjy. Combs to P^q — P25, 

 most often on every two p., here and there even to Pg,,. The basal 

 segments of the pinnules distally somewhat bent outwards and bor- 

 dered with spines. Genital p. 7 mm. Distal p. 20 — 25; 9 mm. Dorsal 

 hooks on the last 9 — 12 segments. 



Disk smooth, without calcareous granules or papilise, 25 mm. 

 Anal funnel central, short, verruciform, L = 4 nnn. Colour yellow- 

 brown. Cirri whitish with brown transverse bands. 



In the pinnules and arms an ento-parasitic new myzostomid, 

 compare Protomyzodomum. 



Sp. 2 (St. 45) The free dorsal surface of Cd 4 mm. C. XXVn 

 23—25 (D) 25 — 27 (V), 25—30 mm. in 2 whorls. 



R — s appearing in the corners. I Br 1 h = ^4 X br. united by 

 synarthry with I Brax, Laterally of half their height fused with each 

 other. Disk somewhat more visible in the interspace between the 

 arms than in the preceding specimen. I Brax flattened pentagonal, 

 h = ^/3 X br. Pi'imipostaxillaries united inside for the most part. II 

 Br:s are 4 (3+4) 9 cases. III Br:s : 2, 13 cases, IV Br:s : 4, 3 cases. 

 Synarthrial tubercle between II and III Br 1 — 2. Arms XXXV + (pro- 

 bably XXXIX in the complete specimen) 125 mm. Arm-bases in this 

 and the following specimen smoothei- tl^m in the preceding one. The 

 bi-eadth of the arms proximally 2,2 mm., in the middle of the arm 

 1,7 mm. 



P„ + 40 (7 T) 16 mm. Pjv + 38 (7 T) 15 mm., P^ + 25 (6 T) 5 mm. 

 Pg IS; 3 mm. Then longer p. again; combs here and there at least 

 to P25. Distal p. 18; 7 mm. 



Disk 18 mm. Anal interradius large, swollen, with calcareous 

 papillae. Colour grey-yellow. 



Sp. 8 (St. 45) C. XX 19-20 (D), 26-27 (V), 12-25 mm. II 

 Br:s are 4 (9 cases), III Br:s : 2, IV Br:s : 2, V Br:s : 2 ( 1 case). Arms 

 XLVII 105 mm. 



Nova Acta Keg. Soc. Sc. Ups., Ser. 4, Vol. 5. N:o G. Impr. -"ii 1922. 5 



