North American index fossils, invertebrates . Fig. 1905. Onychocrinus exculptus, X Vz- (After Meek and Worthen plates, supporting a small tube above. Tegmen formed of almostmicroscopic particles and very flexible. Arms 10, giving off arm-lets in clusters. Mississippic. 198. 0. exsculptus Lyon and Casseday. (Fig. 1905.) ornamented with minute of Kentucky, Indiana and Illinois. LXXVL FoRBESiocRiNUS de Koninck and le to Taxocrinus, but differs in its anal area. Both IRAand RA present. Interbrachials very numerous, sometimes in 12or more rows. Arms
North American index fossils, invertebrates . Fig. 1905. Onychocrinus exculptus, X Vz- (After Meek and Worthen plates, supporting a small tube above. Tegmen formed of almostmicroscopic particles and very flexible. Arms 10, giving off arm-lets in clusters. Mississippic. 198. 0. exsculptus Lyon and Casseday. (Fig. 1905.) ornamented with minute of Kentucky, Indiana and Illinois. LXXVL FoRBESiocRiNUS de Koninck and le to Taxocrinus, but differs in its anal area. Both IRAand RA present. Interbrachials very numerous, sometimes in 12or more rows. Arms long, bifurcating, with infolding tips. Mis-sissippic. ECHINODERMATA—CRINOIDEA. 567. 199. F. agassizi Hall. than F. zuortheni, with interradial areas less of Iowa. 200. F. wortheni Hall. () Mississippic. Interradial areas of Indiana, Illinoisand Iowa. ^V LXXVII. UlNTACRINUS perfectly in thin. Stem wanting. B5, enclosing a small, five-sided,centrodorsal plate. Costals two,the upper one axillary and sup-porting two rows of distichals, which are succeeded by numerous, the lowest ring interposed between thecostals. Arms ten, long and pinnulate, composed of very short,almost circular, joints. Pinnules heavy and closely arranged, thelower ones united by sutures and incorporated into the free, floating as plankton. Cretacic. 201. U. socialis Grinnell. (Fig. 1907.) subglobose, composed of numerous, slightly convex plates joined together, with channelled sutures and without distinct sur-face markings. IR, eight or nine in number,
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Keywords: ., bookcentury1900, bookdecade1900, bookidn, booksubjectpaleontology
