140 T. (ilS].KN, 



llio Zenometrinœ io l)c (lie origiiuil lype l)ecaus(; ni' \\u- luniiatinii u\ 

 the Cd which probably more ilian that of the Baihymelriiut'^ resciii'olos 

 the Cd of the more primitive {Alelccrinoid?} forms fi'om which tlic Ma- 

 crophreats originate. 



The new species, which I have named aftei- I'rof. A. Wirkn of 

 Uppsala, is in other respects approaches closest to Pu. inusiiata and 

 Ps. anomala. 



Perométrinse A. II. Clark. 



Erythrometra A. H. Clark. 



E. rubra A. H. Clark. 



Fig. 150-152. 



Sya. : Aniedon ruber 1907 A. H. Clauk Proc. U. S. Nat. Mus. Vol. 33, 

 p 146. 



Erythrometra ruber 1908 A. H. Clahk Wash. Proc. Biol. Soc. Vol. 121, p. 

 126; Proc. U. S. Nat. Mus. Vol. 34, p. 3J6; 1909 Kobenhavn, Videnskabl. Meddel. 

 p. 190; 1912 Crin. Ind. Oc. p. 233; 1915 Wash. Journ. Acad. Sei. Vol. 5, p. 215; 

 1918 Siboga Exp. Vol. 42 B, p. 236. 



From St. 11=8 specimens. 



Sp. 1 (St. 11) C. XX 24-25 (D), 34-36 (V); 7—11 mm. 1^^ and 

 2'' segments short, 3** cubical, 5*'' the longest, L = l'/2 — 1^3 br, then 

 slowly decreasing, 10"' segment about, cubical. From this segment a 

 dorso-distal swelling on the cirrals, and this prominence gradually de- 

 velops into a blunt, longitudinal crista (most prominent about 9 — 10 

 segments from the last one). Antepenultimate segment almost smooth. 

 Opposing spine stout, h = ^/s of the br of the segment. Terminal claw 

 curved, L about the same as the penultimate segment. 



R — s h = V6 br. I Br 1 h — '/2 br, laterally almost free, though 

 nearly standing, distally somewhat incised in the middle by the obtu- 

 se-angled proximal border of the axillary. The synarthrial swelling 

 inconspicuous. Axillary rhombic, h ^ ^4 br, lateral angles with ve- 

 ry slight, small spines. Arms X, 25 mm. +. Br — s 1 inwardly united 

 by pairs, outwardly 1 '2 X broader. The proximal border of Br 2 



