The Crinoids from Dr. S. Bock's Expedition to Japan 1914. 119 



Charitometridae A. II. Clark. 



Crossometra A II. Clakk. 



Cr. septentrionalis A. II. Clark. 

 Fig. 77. 78. 



Syi).: Charilometru distincta (pieoccupiedj 1908 A. II. Clark Proc. U. S. 

 Nat. Mus. Vol. 34, p. 312. 



Pachi/lomefra sepientrionalin 1911 A. II. Clark Proc. U. S. Nat. Mus. Vol. 

 39, p. 554; 1912 Crin. Lui. Oc, p. 215; 1915 Wash. Journ. Acad. Sei. Vol. 5, p. 215. 



Crossometra sejjfenfrionalis 1918 A. H. Clark Siboga Exp. Vol. 42 B, p. 176. 



From St. 30 = 1 specimen. 



Sp. 1 (St. 36) Cd br 3 mm., h 1,5 mm., rounded conical, free dor- 

 sal surface without tubercles, 1,5 mm. C. XIX 14—16; 14 — 17 mm. 

 very coarse, in a single or double whorl and 10 rows. 5"" segment 

 the longest L=1V2 br. From the 8"' segment a dorsal, longitudinal 

 crista. The ventral margin of the distal segments about as long as 

 the br. Opposing spine h = i/3 of the br of the segment. Terminal 

 claw curved, somewhat longer than the preceding segment. 



B — s projecting as large interradial prominences. R — s: h = Vs 

 br with a median tubercle. I Br 1 h = V's br, laterally united, as on 

 the proximal part of I Brax with a median tubercle. I Br 2 h = V/s br. 

 II Br — s: 4 with similar median prominences. Primipostaxillaries united 

 inside. Ill Br — s: 2, developed on the inner sides. These ossicles 

 and Br 1 and 2 with still slighter median tubercles. Arms XVIII +, 

 70 mm., strongly wall-sided out to Br 2. The bases of ?„ visible be- 

 tween the arm-bases. Br 1 — 12 discoidal, then oblique joints, l"*' sy- 

 zygy on the inner side usually between Br 1 and 2. Distally with an 

 interval of 4 oblique ai-ticulations. Example: Br 1 — 2 3 + 4. ..11 + 12.. 

 16 + 17 . . 21 + 22 . . . The distal Br-s with a low, not overlapping 

 dorsal spine. Example of arm-branching and regeneration: 



Br^ 1 + 2 3 + 4i 5, 62 7^ . . 



fBr, 1+2 3 4 5,6.,.. 



nil 1+2 ' 



I 1- 



II 1-2 3 + 4j 



Br^ 1 + 2 345 6... 14i + 152 



II 1—2 3 + 



