Thio Crinoids from Dr. S. Bock's Kxpedition to Japan H»I4. 123 



ally flanked l)y an additional side-spine on each outer side. (A bii'nca- 

 ted opposing spine has been previously noticed only in the genus Eiii- 

 inelra fani. Golobomelrida). 



D. Bocki n sp. 



Fig. 7l»— 84. Photo 10. 



From St. 50: 1 specinien. 



»S^). / (St. 501 Cd pointedly conical, h 3.o nmi.. i>i". '^ mm. 



(\ XXVI 10—12 (D) 15 — 17 {\): 5—0 or 15 — 20 mm. respec- 

 tively, in 8 — 4 whorls. The cirri are arranged in 5 radial groups se- 

 parated by interradial interspaces which are almost as broad as the 

 area occupied by the C. In each group 5 — cirri, often forming an 

 almost single row. 1*' and 2'' segments short, 3'' cubical, 4*'' increasing, 

 5"! — 7t'i L = I'/s br, 8"'( — 0"') — the antepenultimate segment not much 

 longer than broad. The dorsal surface of the distal cirrals slightly 

 carinated and overlapping. No dorsal spine. Opposing spine in the 

 distal pai't of the penultimate segment, lai'ge, in the middle deeply in- 

 cised and therefore bifurcated, on the lateral sides moi'eover often a 

 small additional spine. Terminal claw slender, curved, j)ointed, longci- 

 than the preceding segment. 



R — s \-isible as narrow bands in the corners. I Br I h = '/■* br, 

 in the basal half laterally grown together, at the middle somewhat 

 narrower because of the synarthrial tubercle from I Brax. I Br 2, 

 pentagonal, h = '/abr as the preceding ossicle with a slight median 

 carination, the rest of the ossicle rounded doi'sally. The II Br-s are 

 2, similar to the I Br-s. Primipostaxillaries in the basal half gi'own 

 together in pairs. Arms XIX + (probably originally XX), 00 nnii., in 4 

 cases broken between I Br 1 and 2 (the synarthrial articulation well 



rus Vi; 101, 102 Pteroiitclra irichopoda (St. 4,")) 101 a) Tliu 15 most proximal cirrals, with a 

 ventral spine fri)m the 4tli^ the l;itli segments b) The 20 most distal cirrals "/i, 102j Distal ])in- 

 uule "/i; 103, 101 Perissometra arnncn (St. 7 a, Sp. 1) 103) Distal pinnule ", i. 101) Cirrus »i; 

 105—108 Compsoiiietra scrrnta (St. 25, Sp. 3) 105) Genital pinnule ''.'i, lOti) P.^ (observe the 

 indistinct stripe under the .sacculi; a rudimentary genital cord?) "/i. 107) P, '* i, lOH) Cirrus " i; 

 109—113 Comiisometvd pnrviflorn (.St. 47) 109) .\ stump of the arm with a distal pinnule 'Vi, 

 110) The base of an arm from I Br 1 — Br 5 "/i , 111) Cirri a) St. 47, b) from tlie dorsal whorl 

 of a specimen from St. 45; long cirrals '•',1, 112) Br 4-8 with P., and P, '■',1, 113) P, 'Vi; 

 114—116 Toxometra aqnipinvn (St 4, Sp. 1) 114) Cirrus '^i, 115) PJ '* 1, 110) Distal pinnule 

 with a small genital gland " 1. 



