THE CRINOIDEA 



185 



arms, short in proportion to cup, borne on a sharply denned radial facet, 

 and forking on IBr (further branching unknown) ; they are loosely 



'..IBr t 



FIG. CIH. 



Uintacrinus soclalis, Upper Cretaceous of America, | nat. size. 1, from the side. 2, from 

 below, c, centrale ; Ji, basals ; R, radials ; IBr\, first primibrach ; Ax, primaxil ; 1, 2, 3, etc., 

 secundibrachs, bearing p, pinnules, some of which are included in the walls of the cup, viz. 

 f.p. ; s, syzygy. The intercalated plates, which bind these elements together, are shaded. 



united by iBr, but do not merge in the dorsal cup. Cup large, com- 

 posed of 5 RR, 5 BB, 5 IBB, and a large centrale, with no trace of a 

 stem. Genus Marsupites, J. S. Miller ex Mantell MS. (1821 ; synn. 



^-. c 



FIG. CIV. 



.!/</ ,>/(/, iVx tt'ttmlinarius. 1, the cup from thi> side, showing the character of the ornament ; 

 (from Urit. Mns. specimen, E2018), x f. 2, the radials and proximal region of the arms (from 

 Brit. Mus. 5482), nat size. C, centrale ; /, fulcral ridge of radial facet ; p, pinnules ; s, 

 sy/ygies. Other letters as usual. 



Sitularia, Cumberland ; Marsupiocrinus, de Blainville), Upper Cretaceous, 

 England and Germany (Fig. CIV. ; see also Fig. XVII. 4). The relations 

 of the genus are riot yet clear. FAMILY 12. BATHTCRIXIDAE. Dendro- 



