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
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