. On a Trenton Echinoderm fauna at Kirkfield, Ontario [microform]. Paléontologie; Paleontology; Ãchinodermes; Echinodermata. 38 Oi;, SL'BVEV, he â, oi thi. 1., M, Billing, â. a .... distinc-t generic u on ,'"r "'â¢-â¢. ^^"^'-""idea to «how a tendeuc. to pin! , . oha,aoter iâ tim respect being quite reinari leaving the nature of the arms and ventral etvond hat evel unkno. .. The principal distinction -eUed on Z IT' "" ^^-'^rocrun. was the construction of e"en r 1 : :'""'' "
. On a Trenton Echinoderm fauna at Kirkfield, Ontario [microform]. Paléontologie; Paleontology; Ãchinodermes; Echinodermata. 38 Oi;, SL'BVEV, he â, oi thi. 1., M, Billing, â. a .... distinc-t generic u on ,'"r "'â¢-â¢. ^^"^'-""idea to «how a tendeuc. to pin! , . oha,aoter iâ tim respect being quite reinari leaving the nature of the arms and ventral etvond hat evel unkno. .. The principal distinction -eUed on Z IT' "" ^^-'^rocrun. was the construction of e"en r 1 : :'""'' " '"'T'' "' ''^'"'â «°'"'' "'- - -' - longitudina rows .. e case n. that genus, and .light difference, in for^ o the ;;:;i:;:;:;:;:rr"-"- ''^''-- - "⢠^-^ -- ^^^^- lonJ'T'I '^ ";"'^"'^«*'''" «" 'he fourth or fifth brachial into two Ite , T "'"" '"'""'" = "'''^ ''^- "â¢"»>«« o" each side alternately fron. every fourth joint, oc-casionally third, or fifth The mnulea are notably smaller than the arm-about halt it d'a rneter-and they subdivide on the fifth or joint into two verv ^eventh o eighth giving final divisions of extreme tennitv >âs (Se. Bather. Treatise on Zoology, fig. XXI, 1). This i. the mode of branching in 0. typus; it is varied somewLt in another ^Peces, as wi be shown presently. The ventral sac i. 1 ng. exS â n. to the full height of the arms, and is composed throughouTof In 0 typus ,t .. det. * . and the plates smooth. I have figured three specmens .llustratin, these characters (Plate IV. figs. 6 C ^ the f ! frT," ^"T^"" "â '" '"«t>'»»"i«hed from Dendrocrinus bv the fact that the radial facets here fill the entire distal face of the r« mstead of being mere rounded sockets in the middle of them as n that genus.
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Keywords: ., bookcentury1900, bookdecade1910, booksub, booksubjectpaleontology
