154 T. GisLEN, 



tranus by tlie number of intei'nodal joints, by the diameter of tlie stem, 

 by the L of the cirri wlien compared with the L of the internodes; 

 M. n. var. tmoriensis by the variability' of the I Br-s. It ouglit tlierefore 

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

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

 stem and short pinnules. 



Metacrinus rotundus P. II. Carp. 

 Fig. l.")l). 100. 



Syn : Metacrinus rotundus 1884 P. H. Carpenter Chall. Exp. N'ol.ll, j). o44; 

 1885 Trans. Linn. Soc. Rer. 2 Vol. 2, p. 436; 1902 (04) Frank Sperrv Pioo. Mich. 

 Acad. Sci., p. 195; 1908 A. H. Clark Pioc. U. S. Nat. Miis. Vol. 34, p. 529; 1911 

 Proc U. S. Nat. Mus. Vol. 39, j). 487; Notes from the Leyden Mu.s. Vol. 33, 

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

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

 1915 Monograph p. 89. 



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

 Trans. Linn. Soc. Ser. 2. Vol. 2, p. 443; 1908 A. II. Clark Proc. U. S. Nat. Mus. 

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



21ie Vec/a specimen 1884 P. H. C.\rpenter Chall. Exp. Vol. 11. p. ;!44. 



From St. 10 (I sp.). 24 (1), 29 (1). :]0 (1), 31 (2), 32 (1) = 7 specimens. 



Sj). 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 o^"" internode. Interarticular pores to the 12'*' internode. 

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

 15:2 cases; 14 — 17 mm. Stem after the 16'^ 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 

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



Cirri 44 (VlII"' node), 48 (XI), 37 (XII), 44 (XV): 49-50 'mm. L 

 of the 5 first segments = \/a br, about the 12"' cirral L = bi-. A dorsal 

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

 each ossicle appearing after the 20"' cirral. Cirri extending over 2'/2 — 

 3'/* internodes. 



B— s contiguous, L = "^3 br. I Br-s 7 (1 + 2, 4 + 5) in 5 cases; 

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



