90 T. GiSLKN, 



Tropiometridse A. 11. Clark, 

 Tropiometra A. II. Clakk. 



Tr. afra var. macrodiscus (IIaka). 



.Syn.: Antvdon »uicroiliscus 1895 Haka Zool. Mag. Tokyo Vol. 7, p. 115. 



Tropiometra mctcrodiscus 1907 A. II. Clark Smiths. Misc. Coll. Vol. 50, p. 

 349; 1908 H. L. Clark Bull. Mus. Comp. Zoo). Vol. 51 (N:o 11), p. 279; 1912 A. 

 II. Clakk Smiths. Misc. Coll. Vol. 60, N:o 10, p. 28; 1915 Jouin. Acad. Sei. Vol. 5, 

 p. 214; Monograph pp. 52, 54, 275; 4918 Sihoga Exp. Vol. 42 B, p. 131. 



Tropiometra afra (\)avi) 1908 A. H. Clark Proc. U. S. Nat. Mus. Vol. :]4, 

 p. 315; 1912 Crin Iml. Oc. p. 176. 



From 8t. 27 = 9 specimens. 



Sp. 1 (St. 27) C(i discoidal, flat doi'sal surface with slight radi- 

 ating swellings, 10 mm. 



C. XLIII 36 — 30, +40 mm. in two whorls. The segments are 

 uniform, cubical or somewhat (L = ^2 — ^s br) shorter. No dorsal 

 spine. Terminal claw a little longer than the penultimate segment. 

 Cirri coarse. Ventral cirri shortest and with a less number of seg- 

 ments. 



R — s somewhat projecting in the corners. I Br 1 h = V^ br, 

 laterally grown together as are also the bases of the axillaries. The 

 articulations between the proximal ossicles indistinct. I Br 2 h = \'3 br, 

 pentagonal or almost triangular with a small median tubercle well 

 marked off from I Br 1. The proximal segments flattened, granular, 

 as is often the ease in OUgometrides. Arms X, 190 — 210 mm. Br 1 

 united inside in pairs, their br 5,.5 mm. Br 1 and 2 on the outer side 

 twice as long. All the distal segments short, discoidal. Ex. of syzy- 

 gies: 3 + 4, 8 + 9, 13 + 14, 30 + 31, 39 + 40, 50 + 51 or 3 + 4, 9 + 10, 

 15+10, 28 + 29, 41 + 42, 51 + 52 . . . Distally with an interval of about 

 8 oblique articulations. The L of the segments = '/4 br. 14 segments 

 per cm. (12, if the syzygial pairs are counted as units). 



Pj 25—27; 20' mm., P., 34; 26 mm. (L. of the segments = l\/2 br). 

 Pg — Pj,, slowly decreasing, larger and coarser than the following pin- 

 nules. Ambulacral furrow does not appear until P9( — Pu) (with the 

 exception of on an arm shorter than the other ones). Distal p. + 35; 15- 



