North American index fossils, invertebrates . Fig. ^936. Linthia variabilis, several plates of the left posterior petal, greatlyenlarged ; apical system, greatly enlarged; several plates of the anterior petal, greatlyenlarged. (After A. W. Slocum.) strongly elevated and truncate; ambulacral petals proportionatelyshorter and broader. Ripleyan of L. tumidula Clark. (Fig. 1937, a-J.) Cretacic. Test elevated. Apex central. Posterior border obliquely trun-cated, bearing the anal opening. Fascioles distinct. Jerseyan (Vincentown lime sand) of New Jersey. 6o2 NORTH AMERICAN INDEX FOSS
North American index fossils, invertebrates . Fig. ^936. Linthia variabilis, several plates of the left posterior petal, greatlyenlarged ; apical system, greatly enlarged; several plates of the anterior petal, greatlyenlarged. (After A. W. Slocum.) strongly elevated and truncate; ambulacral petals proportionatelyshorter and broader. Ripleyan of L. tumidula Clark. (Fig. 1937, a-J.) Cretacic. Test elevated. Apex central. Posterior border obliquely trun-cated, bearing the anal opening. Fascioles distinct. Jerseyan (Vincentown lime sand) of New Jersey. 6o2 NORTH AMERICAN INDEX FOSSILS.
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Keywords: ., bookcentury1900, bookdecade1900, bookidn, booksubjectpaleontology
