The CßiNoiDs from De. S. Bock's Expedition to Japan 1914. 11-^ 



usually begin to be resorbed at an arm-leng(li of 10 — 12 mm. and are 

 completely lost when the arms measure 15. mm., that is at about the 

 same time as the arms get a complete pinnulation. — The smallest 

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

 under tiie radial whoil. In the smallest specimens the latter practi- 

 cally encloses the whole intestine sac. All these primitive charac- 

 teristics thus persist rather late. 



Stenometra A. H. Clahk. 

 St. dentata ii, sp. 



Fig. 87— 01. Photo 7. 

 Fi'om St. î)~) (Ij, 56 (5), 59 (3j = 9 specimens. 



Sji. 1 (St. 56) Cd cylindrical, the flattened, dorsal pole with 

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

 part of Cd 1,5 mm. 



C. XXn' 7-1 — 76; 25 — 34 mm. in two close whorls, which are 

 ventrally divided in groups, separated IR. by ribbons of Cd. P* seg- 

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

 what serrate border. 2'' and 3'' segments L = ^2 br. similar to the 

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

 ments cubical or a little longer. 6*^''— 10^'* slightly hour-glass-shaped, 

 L = 1^/2 br. 1**' — 7*'' segments with a small ventral spine, slightly pro- 

 jecting in lateral profile, because of the above-mentioned collar. 8"' — 

 13"'( — 16'^) segments smooth, then a dorsal spine. Distal segments L = 

 '2 — '/3 X br. Dorsal spine small, distinct, distally curved, h = '/3 — \4 

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

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

 nultimate segment. 



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

 radial ribbons on Cd, L = + 'e bi-. I Br 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 

 overlapping ends of the segment, I Brax h =//2 br, rhomboidal, in the 



