154 T. GiSLÉN, 



iranus by the iiuiiiber of inlei-nodal joints, hy tlic diainetei' of (lie stem, 

 by the I^ of tlie cirri when compared willi the L of the iiitei-nodes; 

 M. n. var. timoriensis by the variability of the I Hi-s. It ought tlierefore 

 not to be so surprising that the "new variety of M. nobihs established 

 here approaches M. varians in a couple of characteristics: a slender 

 stem and short pinnules. 



Metacrinus rotundus 1*. II. Carp. 



F\g. 159, l(jO. 



Syn.: Metacrinus rotundus 18S4 P. H. C.\rpexter Chall. Exp. Vol. II, p. :]44; 

 1885 Trans. Linn. Soc. Ser. 2 Vol. 2, p. 436; 1902 (04) Fr.^nk Sperry Proo. Mich. 

 Acad. Sei., p. 195; 1908 A. H. Clark Pjoc. U. S. Nat. Mus. Vol. 34, p. 529; 1911 

 Proc. U. S. Nat. Mus. Vol. 39, p. 487; Notes from the Leyden Mus. Vol. 33, 

 p. 192; 1912 Crin. Ind. Oc. p. 270; Proc. U. S. Nat. Mus. Vol' 43, p. 408; Smiths. 

 Misc. Coll. Vol. (30, N:o 10, p. 33; 1913 Smiths, Misc. Coll Vol. 61, N:o 15, p. 69; 

 1915 Monograph p. 89. 



Metacrinus Stcwarti 1884 P. H. Carpenter Chall. Exp. Vol. 11, p. 344; 1885 

 Trans. Linn. Soc. Ser. 2. Vol. 2. p. 443; 1908 A. H. Cl.^rk Proc. U. S. Nat. Mus. 

 Vol. 34, p. 529; 1912 Crin. Ind. Oc, p. 270. 



T/ie Vega specimen 1884 P. H. Carpenter Chall. Exp. Vol. 11, p. 344. 



From St. 10 (1 sp.), 24 (1), 29 (1), 30 (1), 31 (2), 32 (1) = 7 specimens. 



S2). 1 (St. 30) 24 Internodes; total length of the stem 400 mm. 3 

 nodal joints before the first cirrus-bearing node. Full number of inter- 

 nodals in the 5"' internode. Interarticular pores to the 12"^ internode. 

 Internodal joints 11:3 eases, 12:9 cases, 13:3 cases, 14 : 3 cases, 

 15:2 cases; 14 — 17 mm. Stem after the lô**^ node decumbent in the 

 bed-ooze. Full-grown segments rounded. The socket for the cirrus 

 extending to the supra-, but not to the infranodal joint. Interradial 

 swellings or tubercles on the nodals (slightly developed distally). 



Cirri 44 (Vin«> node), 48 (XI), 37 (XII), 44 (XV); 49—56 mm. L 

 of the 5 first segments = '/s br, about the 12"' cirral L = br. A dorsal 

 longitudinal carination, more or less divided into 2 prominences, on 

 each ossicle appearing after the 20**" cirral. Cirri extending over 272 — 

 3' /4 internodes. 



B — s contiguous, L = ^/s br. I Br-s 7 (1 + 2, 4+5) in 5 cases; 

 16 mm. Primipostaxillaries free inside. II Br-s 7 (3 + 4) 1 ease, 10 : 1 



