The Crinoids from Dr. S. Bock's P^xpedition to Japan l!ll-l. 2!) 



Sp. IS (St. 47) I Br 1 as in the preceding specimen. 



Sp. 14 (St. 47) I Br 1 h = 's br; Br 1 and 2 each h = '/* X br. 

 Pj with about 25, P.^ with 20 segments. This and the two followino- 

 specimens young individuals with gonads only slightly prominent 



Sp. 15 and 16 (St. 47) I Br 1 h = '/s br. Cd 1,8 mm. 



Sp. 17 (St. 55) With genital glands well developed like both the 

 following specimens. 



Sp. 18 and 19 (St. 55) I Br 1 almost completely hidden. 



Sp. 20 (St. 55). Fixed on a worm-tube. Sp. 21 and 22 (St. 55) 

 Pinnules a little swollen by genital glands. 



Sp. 23 (St. 55) Pa sometimes lacking. Sp. 24 (St. 55) R— s some- 

 what visible. I Br 1 h = '/e X br. 



Sp. 25 (St. 55) R — s narrow bands. I Br 1 h = '/e X br. 3'' cirral 

 L = 3 '/2 br. Antipenultimate cirral L = 1 '/s X br. P 



longest 



the 

 lacking. 



»Sp. 26 (St. 55) Pinnules genitally swollen. 



Sp. 27 (St. 55) Anti- 



penultimate cirral L = 1 ' s x br. I Br 1 h = '/e x br, 



Sp. 28 (St. 61) R— s concealed. 1 Br 1 h = '/4 br. Syzygies with 

 an interval of 3 oblique articulations. Pg inconspicuous or lackino-. 



Sp. 29 (St. 61) 1 Br 1 h = '/2 x br. P^— P^ lacking. 



As is evident from the comparison given above, the number of 

 cirri varies between XII and XX (usually XV — XVI) and the number 

 of cirrals between 8 and 12 (usually 9 — 10). The specimens seem to 

 be mature at an arm-length of 25 — 30 mm., as in such specimens the 

 pinnules are strongly swollen, but even with shorter arms the genital 

 gland is quite visible. All specimens with complete pinnulation have 

 combs on Pj and P., but no teeth on P3. The number of teeth varies 

 between 7 — 10 and is usually 8. — It is interesting to observe the 

 relation between the length and breadth of the most proximal Br-seg- 



ments. The smallest specimens (e. g. Sp. 25 and 29) have the R s 



plainly visible. I Br 1 is rather long in minor specimens (h = '/2 — 

 Vs X br), but becomes more and more short during growth (in full- 

 grown specimens the h is = 'e — '/s x br or the ossicle is almost 

 completely hidden by Cd). The length of the axillary also usually 

 decreases (from L = ^'s to '/5 X br) but is ne\er hidden by Cd. 



The specimens approach C. ignota, from Avhich they differ by 

 having, on an average, more cirri, by some differences in the condi- 

 tions of length of the cirrals, by smaller size etc. 



