The Crinoios from Dr. S. Bock"s Expkdition to Japan MM -I. 1 IT) 



usually begin lo be resorbed at an ann-lengtii of 10 — \'2 nun. and are 

 coini)letely lost when tlie arms measure 15 nun., that is at about the 

 same time as tlie ai'ms get a complete pinnulation. — The smallest 

 specimens have also lai-ge B — s which form a continuous ring visible 

 undei- the radial whorl. In the smallest specimens the latter pi-acli- 

 cally encloses the whole intesline sac. All these pi'imitive charac- 

 teristics thus persist rather late. 



Stenometra A. II Clakk. 

 St. dentata ii sp. 



Fig. 87—01. Photo 7. 

 Fi-om St. .').■) ( Ij. .■)('» (.")). 5!t (;)) = 9 specimens.- 



Sp. 1 (St. .")()) Cd cylindrical, the flattened, dorsal pole with 

 small spines: diameter of the dorsal surface 2 mm. H of the free 

 pai't of Cd 1,.=. nun. 



C. XXI\' 74 — 70; 25—34 mm. in two close whorls, which are 

 vent rally di\ idetl in groups, separated IK. by ribbons of Cd. 1**' seg- 

 ment short with a distal collar which, especially ventrally, has a some- 

 what serrate border. 2'' and 8'' segments L = ^2 br, similar to the 

 preceding segment but with a slighter distal collar. 4"' and 5"' seg- 

 ments cubical 01- a little longer. (>"'— 10"' slightly hour-glass-shaped, 

 L = 1' 2 bi'. 1^' — 7"' segments with a small ventral spine, slightly pro- 

 jecting in lateral profile, because of the above-mentioned collar. S"' — 

 13"'( — Itj"') segments smooth, then a doi-sal spine. Distal segments L = 

 V/2 — '/3 X bi'. Dorsal s])ine small, distinct, distally curved, h = 'a — ' 4 

 of the br of the segments. Opposing spine somewhat coarser, h = '(2 

 of the br of the segment. Terminal claw about as long as the pe- 

 nultimate segment. 



R — s narrow iiands, IR somewhat bent outwards by the inter- 

 radial rii)iions on Cd, L = + ' '6 br. 1 lir 1 h = '4 br. laterally free, 

 with a median carination and moreover both proximally and distally a 

 vertical 4— 5-lobated calcareous plate, constituting the enlarged and 

 ovei-la])ping ends of the segment. I Hi'ax h = ' 2 br. rhomboidal. in the 



