The Crinoids from Dr. S. Bock's Expedition to Japan 1914. 39 



(in conformity to which it has the 111 Br series with following Br 1+2 

 developed and is therefore certainly determinable). — The combs 

 occur more and more abundantly on larger specimens and, finally, 

 in full-grown specimens reach far out on the distal parts of the arms. 

 Usually a comb occurs on every second pinnule. — The late onto- 

 genetical occurrence of combs on distal pinnules probably has a corre- 

 spondence in the phylogenetical evolution and might stand in a certain 

 relation to an altered manner of living and a different mode of catch- 

 ing the food, a question that 1 shall discuss in another connection. 



Gomantheria A. H. Claek. 

 C. grandicalyx (P. H. Carp) 



Fig. 30, 31. 



Syn.: Actinometra f/nindic<ih/x i882 P. H, Carpenter Jourii. I.inn. Soc. 

 Vol. 16, p. 520. 



Gomantheria grandicalyx 1912 A. H. Clark Crin. Ind. Oc. p. 90; Smithson. 

 Misc. Coll. Vol. 60, N:o 10, p. 7; 1915 Journ. Acad. Sei. Vol. 5, p. 214; 1918 

 Siboga Exp. Vol. 42 B, p. 43. 



From St. 52: 2 specim.ens. 



Sp. 1 Cd 10 mm. in diameter, the dorsal surface very concave, 

 free dorsal pole 6 mm. 



C. ± LXXV 26 (D) 25 mm., 30—31 (V) 29—34 mm., in about 3 

 close whorls. P' to 5*'' segments shorter than long to cubical. 6*'^ to 

 11* or 14"' a little longer than broad, the following segments decreas- 

 ing, L = -/3 — 1/2 X br. From -the 20*'' op 25"' segment a very weak 

 and indistinct dorsal spine. Opposing spine a little stronger. Termi- 

 nal claw rather coarse, somewhat longer than the penultimate segment. 



I Br 1 almost concealed. I Brax low pentagonal L = ^s X br, the 

 distal margins concave. II Br 1 basally united in pairs inside. Ill Br 1 

 and 2 and sometimes also Br 1 and 2 fused in pairs on the inner side. 

 II Br:s : 4 (3 + 4), III Br:s : 2 (1—2, a weak synartlirial tubercle), IV 

 Br:s : 4 (3 + 4). The components of the division seiics smooth, broad, 



