A treatise on zoology . become syzygial {apudDanielssen) ; only the distal bracliial of each pair bears a pinnule, andthere are no pinnules on the first few pairs ; the arms are loosely incor-porated in the cup to half-way up IIBr., ; lax has large muscle-fossae onstrong wing-like processes (cf. Fig, XVIII. 6). BB fused in adult to asingle discoidal ossicle ; RR also become closely united ; IBB obsolete. Interambulacral areas of tegmen containscattered small plates, and sometimes eachhas a large plate, which may be an dicebox-shaped and twisted,with bifascial articular surfaces
A treatise on zoology . become syzygial {apudDanielssen) ; only the distal bracliial of each pair bears a pinnule, andthere are no pinnules on the first few pairs ; the arms are loosely incor-porated in the cup to half-way up IIBr., ; lax has large muscle-fossae onstrong wing-like processes (cf. Fig, XVIII. 6). BB fused in adult to asingle discoidal ossicle ; RR also become closely united ; IBB obsolete. Interambulacral areas of tegmen containscattered small plates, and sometimes eachhas a large plate, which may be an dicebox-shaped and twisted,with bifascial articular surfaces ; eachsaid by Danielssen to be formed byfusion of two columnals ; those in theyounger, proximal region are thin anddiscoidal. The root branches. Genus—Bathycrinus, Wyv. Thomson (1872 ; seeP. H. Carpenter, 1884, and Danielssen,1892; syn. Ilycrinus, Danielssen & Koren,1877), North Atlantic and SouthernOcean, at 750-1500 fathoms (Fig. CV.).Carpenter places this in the Bourgneti-crinidae on tlie grounds of its resem-. blance to Rhizooinus, while admitting Fk;. CV. fUithncrinus. 1, crown of 11. Aldri-rhianiin, nnt. sizo (after P. H. Car-l)«iit«!r). J, 3, and 4, H. ((iri>euteri,(afliT Daiiitrlsson). 2, new radials andarms on an old hast; iind stem, x 4diatn. [i and 4, Ht»in frn>{nients, , pti, pinnules; rt, root-cirri;>7|, proximal re^ion of stem; .S7j,median ditto; Stj, distal ilitto.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
