. Report of the Geological exploration of the fortieth parallel . Conrads group Trigonarca; but, until the hinge canbe seen, its relations to that genus cannot be satisfactorily determined. Iknow of no very nearly allied species. Locality and position.—East Canon Creek, Wasatch Range, Utah; in awhitish sandstone of Cretaceous age. Genus AXIN^A, Poll. AxiN^A Wyoming-ensis, Meek Shell attaining a medium size, subcircular or very slightly longer thanhigh, gibbous, thick, and strong; beaks rather prominent; basal marginsemicircular, and rounding regularly upward in front into the anterior border,w
. Report of the Geological exploration of the fortieth parallel . Conrads group Trigonarca; but, until the hinge canbe seen, its relations to that genus cannot be satisfactorily determined. Iknow of no very nearly allied species. Locality and position.—East Canon Creek, Wasatch Range, Utah; in awhitish sandstone of Cretaceous age. Genus AXIN^A, Poll. AxiN^A Wyoming-ensis, Meek Shell attaining a medium size, subcircular or very slightly longer thanhigh, gibbous, thick, and strong; beaks rather prominent; basal marginsemicircular, and rounding regularly upward in front into the anterior border,which rounds to the cardinal edge, so as scarcely to produce more than avery slight angularity at the connection of the two above; posterior marginmaking a slightly broader and similar curve, excepting that it is faintlysinuous above the middle; hinge-plate thick, moderately arched, with denti-cles rather strong, nearly straight, or a little curved, numbering about eightor ten well-developed ones in front, and seven or eight behind, with per- 150 Fiff. 3.
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