94 T. GisLÉN, 



with longer cirrals) shows nothing, for, as is well known, all .\oung 

 Crinoids have longer cirrals. As a general opinion one may say (iiat 

 the difference given by Clark 1918 seems to be the only distinguish- 

 ing feature, but that it is probable tliat the difference is only a func- 

 tion of different geogra|)hical and ecological factors. Here, as always, 

 one has, however, also to keep in mind the probability of hybridisa- 

 tion between two separate forms, which would give intermediate forms 

 in the transition territory. Such intermediate foi'ms are, according to 

 Reichensperger, found at Ceylon, but whether they are caused by 

 geographical factors or by hybridisation cannot yet be determined. 



Calometridse A. H. Clark. 

 Neometra A. IL Clark. 

 N. multicolor A. H. Claek. 



Fig. 75, 76. 



Syn.: Äntcdon -discoidea (part) 1906 Mc Clendon Bull. Ainer. Mus. Vol. 22, 

 pp. 120, 125, 126 according to A. H. Clark. 



Antedon multicolor 1907 A. H. Clark Proc. U. S. Nat. Mus. Vol. 33, p. 130. 



Antedon thetis 1907 A. H. Clark Proc. ü. S. Nat. Mus. Vol. 33, p. 151. 



Calometra multicolor 1907 A. H. Clark Smiths. Misc. Coll. Vol. 50, p. 363. 



Neometra multicolor 1912 A. H. Cl.a.rk Crin. Ind. Oc. p. 183: Smiths. Misc. 

 Coll. Vol. 60: 10, p. 29; 1915 Monograph pp. 67, 329, 363; Wash. Journ. Acad. Sei. 

 Vol. 5, p. 214; 1918 Siboga Exp. Vol. 42 B, p. 133. 



From St. 12 = 2 young specimens. 



SjJ. 1 (St. 12) Cd slightly arched, dorsally flattened, 1,:, mm., C. XII 

 27 — 30; 11 mm. in a thin whorl. P* segment short, 2'' cubical, -S'' a 

 httle longer, 4"' and the following ones L=1'2 br, distally shorter. 

 The distal parts of the cirrals from the 5*'^ segment somewhat collar- 

 shaped and bent outwards. Dorsal spine single, from about the 15"' 

 segment. Opposing spine h = i 2 of the br of the segment. Terminal 

 claw curved, shorter than the penultimate segment. 



R— s h = V/4 br, IR prolonged to tips which separate I Br 1 late- 

 rally. I Br 1 h = i3 br, widely spread out from each other, provided 

 with slight lateral prominences and an inconspicuous medio-dorsal list 



