The Ceinoids from Dr. S, Bock's Expedition to Japan 1914. 117 



distinctly flattened laterally out to Br 5. Syzygies with an interval of 

 13 — l(J oblique articulations. ï\ 13 -15; 5,ô — 7,.-- mm. P^ 9 — 11; 4,5—5 

 mm. P3 8 — 9, 4 — 5 mm. Distal p-s 11: 5 mm. 



Sp. 4 (St. 56) C. XXI 43—57: 18 — ^:22 mm. Tlie first eirrals 

 Avith a real ventral spine. Dorsal spine from about the 10^'' — 20^'^ seg- 

 ment. Arms XV, 45 mm. The median Ivcel on 1 Br 2 somewhat lower 

 than in Sp. 1. Arms after Br (i witliout lateral prominences. The dor- 

 sal Br-spine low. Syzygies with an interval of 5 — 18 oblique articula- 

 tions. About 90 Br segments. The distal segments with rudimentary 

 p-s are about 5. Example of arm-branching: 



I 1—2 



11 1-2 



Br 1—2 3 + 4 35 + 36 56 + 59 . . 



Br 1—2 3-4 33 ^ 34 . . 44 + 45 . . 53 - 54 



Br 1—2 3 + 4 29 + 30.. 



II 1—2 



I Br 1—2 3 -;- 4 30 -^ 31 .... 43 + 44 



Pj 12; 4 mm. (last 8 segments collar-shaped, their distal parts 

 overlapping; a similar condition, though not so marked on Pg — P4). 

 Pg 9; 3,5 mm. P3 9; 3 mm. P^ 8; 3 mm. Distal p. 12; 5,5 mm. 



Sp. 5 (St. 56) C. XVIII 54—65; 25—30 mm. Arms XV, 60—65 

 mm. A regenerate from a 11 Br 1 with 2 small, still smooth arms. 

 Pj 8 — 13: 4 — 6 mm. P., 8: 4 mm. P3 7; 3 mm. Distal p. 9 — 10: 5,5 mm. 



Sp. 6 (St. 59) C" XVIII 62—65: 24—28 mm. Arms XVI, broken. 

 II Br-s: 2. Pj 13; 5 mm. Disk 6 mm. 



Sp. 7 (St. 59) C. XVII 53-60; 23— 2S mm. Arms XV +, broken. 

 II Br-s: 2. Pj 13; 6 mm. Disk 7 mm. 



Sp. 8 (St. 59) C. XIV 40—43: 15—18 mm. in a partly double 

 whorl, hardly divided in groups. The dorsal surface of Cd 1 mm. — 

 Arms XII, 40 mm. The calcareous lamels on the proximal ossicles 

 only slightly serrate. A single dorsal spine from Br 8. Syzygies with 

 an iii-terval of 5 — 8 oblique articulations. Example: 



