North American index fossils, invertebrates . Fig. 1903. Taxocrinus thiemei,i- (After Meek and Worthen.) Fig. 1904. a, Taxocrinus kelloggi; b, cT. communis. (After Hall and Whitfield.) 196. T. kelloggi (Hall). (Fig. 1904,a.) twice bifurcating, each bifurcating plate being strongly nodose. Arm plates angular and of Ohio. 197. T. communis (Hall). (Fig. 1904, h, r.) T. kelloggi in form and structure, but lacks the nodose bifurcating of Ohio. $66 NORTH AMERICAN INDEX FOSSILS. LXXV. Onychocrinus Lyon and Casseday. Similar to Ichth
North American index fossils, invertebrates . Fig. 1903. Taxocrinus thiemei,i- (After Meek and Worthen.) Fig. 1904. a, Taxocrinus kelloggi; b, cT. communis. (After Hall and Whitfield.) 196. T. kelloggi (Hall). (Fig. 1904,a.) twice bifurcating, each bifurcating plate being strongly nodose. Arm plates angular and of Ohio. 197. T. communis (Hall). (Fig. 1904, h, r.) T. kelloggi in form and structure, but lacks the nodose bifurcating of Ohio. $66 NORTH AMERICAN INDEX FOSSILS. LXXV. Onychocrinus Lyon and Casseday. Similar to Ichthyocrinus in general structure, but calyx depressed, arms spreading and talon-like, interbrachials present between the costals and posterior interray very different from the others, being composed of many minute pieces which enclose a row of small anal. 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
Size: 1382px × 1808px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidn, booksubjectpaleontology
