. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. e as wide as long, and has a well-defined mesialsinus and fold. To include these species in the Genus Retzia, would require a consider-able e^itension of the characters originally given to it; nor does it appearto me that such species as can be naturally grouped with such asTrematospira multistriata and T. costata of the Lower Helderberg group,or T. gibbosa of the Hamilton group. The following
. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. e as wide as long, and has a well-defined mesialsinus and fold. To include these species in the Genus Retzia, would require a consider-able e^itension of the characters originally given to it; nor does it appearto me that such species as can be naturally grouped with such asTrematospira multistriata and T. costata of the Lower Helderberg group,or T. gibbosa of the Hamilton group. The following illustrations will afford the means of comparison amongthese different species. * The R. cuneata is cited in Murchisons Sihiria as Retzia; but in examiningEuropean specimens of this species, as well as the American forms referred to thesame, I have not found either punctate structure or internal spires. t I have heretofore ( Thirteenth Report on the State Cabinet, & 68) shownthat in old specimens of R. increbescens. there is a perforated beak, and a solid tri-angular area below. ^ Specimens received from Dr. Rominger. CONTRIBUTIONS TO 4. • 57.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
