The Crinoids from Dr. S. Bock's Expedition to Japan J914. 103 



Asterometra anthus A. H. Clahk. 

 Fig. 92- OS, Photo 10. 



Syii.: AntedoH loni/icirrd (purl) 1893 Bell .Juuni. Linn. Soc-. Vol. 24, p. 339. 



Antedon aitthiis 1907 A. H. Claük Pioc. V. S Xat. Mus. Vol 33, p. 136. 



Ffllomdra anthus 1908 A. II. Clark Sniitlis Mise. Coli. Vol. 50, p. 359. 



Asterometra anthus 1912 A. H. Clakk diu. IikI. Oc, p. 193; 1915 Wash, 

 Journ. Acad. Sei. Vol. 5, p. 215; 1918 Siboga Exp. Vol. 42 B. p. J41. 



Asterometra acerba 1909 A. H. Clakk Proc. Biol. Soc. Vol. 22, p. 147; 1912 

 Crin. Ind. Oc, p. 193; 1915 Monograph p. 181; 1918 Siboga Exp. Vol. 42 B, p. 141. 



Asterometra lepidn 1908 A H. Clakk Wash. Proc. Biol. Soc. Vol. 21, p. 

 229; 1909 Videnskabl. Meddelser, Kobenhavn. p. 181; 1912 Crin. Ind. Oc, p. 195; 

 1915 Wash. Journ. Acad. Sei. Vol. 5. p. 215; 1918 Siboga Exp. Vol. 42 B, p. 141. 



From St. 45 (5), 46 (2). 47 (-U 53 (11), 54 (2). 55 (1), 5(i (7), 

 57 (Ij, 59 (20) = 54 specimens. 



Sp. 1 (St. 51) Cd pointedly conical, br 3 mm., visible h = 3 mm. 

 Dorsal pole smooth, arched, somewhat hollowed at the top. 



C. X\ni 80 — 81; 50 — 55 mm. arranged in rows which are sepa- 

 rated by radial interspaces. P* and 2'^ segments short, then increasing 

 to cubical or a little longer (5"' — 20*'' segment), distally decreasing 

 again, from about the 40*'' segment L = ^2 br. Usually the 3''(or 5*)- 

 about the 15"' segments have a dorsal crista, which is most marked 

 on the proximal segments. The 15*'' — 25*'' segments are most often 

 more or less smooth, then a doi'sal crest appears, which distally be- 

 comes pronounced to dorsal spines. Opposing spine larger than the 

 preceding ones. h = ^ 2 of the br of the segments (3 — 5 last segments 

 before the penultimate one have very slight dorsal spines or lack theih 

 entirely. Terminal claw short, as long as the preceding segment). 



R — s h = V* br with a tubercle on the medio-dorsal part. I Br 1 

 baso-laterally united, br = 2 * 2 X L. I Brax low pentagonal, like the pre- 

 ceding ossicle with an indistinct, median, longitudinal crista. II Br— s : 2, 

 similar to the I Br — s. Arms XVI, 65 mm. Primipostaxillaries con- 

 nected basally in pairs. Arms laterally sharply flattened out to about 

 Br 10. Ex. of syzygies: 3 + 4, 12 + 13, 22 + 23, 30 +31, 37 + 38 . . . 

 or 3 + 4, 13 + 14, 21 + 22, 28 + 29, 35 + 36, 41+42, 48 + 49, 55 

 + 56.. in a single case 4 + 5. 13-14... After Br 10 decidedly 



'O' 



