The Crinoids from Dr. S. Bock's Expedition to Japan 1914. 57 



two types would also be easy to keep apart if it were a question of 

 systemalically proximal forms, for, as is shown above, such forms 

 are to be found, no matter how the division is made. On the same 

 specimens the combs seldom or never vary in occur-rence on different 

 arms and so to this extent they offer a better distinguishing featui'e than 

 the divisidii-series. Tiie sub-division proposed above is still, however 

 impossible to carry out because of the incompleteness of the prece- 

 ding species-descriptions in the statements as to the appearance and 

 occurrence of combs. So much. ho\\ e\er, can be said, that to the 

 first mentioned genus might be referred the genus Coiiiaster sensu A, 

 H. Clark, Vania (])i'o parte) and eventually Gonianihina (and Coman- 

 tkciia) pro parte. To Üovmnthus sensu nova should be referred Coman- 

 then'a, GoiaaiUhina (p.p.), Comanthiis {Ceuolia) and Vania p.p. 



Young Comasterids from the Benin Islands: 



From St. 44 ( I), 45 (15), 47 ((J), 50 (l|. 53 (1). 54 (1), 



01(1) = 20 specimens. 



Coniatella sp. 



. Sp. 1 (St. 53) C. XrS— 9; 2—2,5 mm. 3'' segment L = 2 1/2 X br. 

 Ternn'nal claw curved, longer than the penultimate segment. 



B— s projecting between the R^s as small corners. R— s nar- 

 I'ow bands. I Br 1 h=-i/3Xbr. Arms X, + 15 mm. Syzygies with 

 an interval of 3 oblique ai-ticulations. The segments somewhat folded 

 outwards and spiny. 



Pj with a comb of 5 — T, P2 and P.j absent. 



Disk smooth, dark-brown. Mouth central. Anal funnel small, 

 not papillated. 



Coinatella sp. juv. or the young forms of a large Comissia sp. 



Sp. 1 (St. 45) C. XIX 14-10; — 8 mm. 4*'^ segment the longest, 

 L = 2 V/2 X br. Dorsal spine from the 4"' segment. — R-s narrow bands. 

 1 Br 1 h =1/4 br, laterally free. Axillary h = V/2 X br, forms with the 

 preceding segment a low synartrial tubercle. Br 2 on the outer side 



Nova Acta Reg. Soe. Sc. Ups., Ser. 4, Vol. 5. N:o G. Iir.pv. ^»/2 1922. 8 



