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Show . APPBSDIX %- PALJBONTOLOaY. 4lfe i- . . ' -. ALLORISMA TEBMINALIS, Hall, (&• sp.) PfcAn t? 4 Fm. 4 » b. Shell elongate- ovoid, with the posterior extremity extended and sub- acute; beaks anterior, or in a line with the anterior extremity of the Bhell;. surface marked by strong concentric ridges, which, diverging from the beak, are more prominent on the central portion of the shell, and gradually die out on the Cardinal Kbe. The shell id also quite smooth toward the basal margin, with the exception of the rather coarse concentric stri » which cover the entire surface. < tig. 4 a, view of the left valve. Fig. 4 b, anterior view of the shall. * Loo. from the Big Blue River. ' NlJCULA AKATA, Hall, ( n. Bp.) PIATI IV. FIG. 5 a b. Shell ov^ l- ovate, rounded* before, and gradually narrowing bo-hind the beaks ( posterior extremity broken off); beaks prominent, closely . incurved " f posterior . lunule elongated and distinctly'defined; surface mar keel by distinct { rather sh* rp where unworn) equal concentric ridges, scarcely so wide as the furrows; between them. The ridges, when « een in * longitudinal direction, hav£ an' imbricated appearance. Fig. 5 a,* the right valve, showing the anterior extremity broken off. Fig. 6 b, a cardinal view; showing the beaks and defined posterior lunule. This beautiful species occurs with Ttrebratula, Spirifer, and Product***, in a decomposing limestone, on the east side of the Missouri Biver, below Weston. ' GASTEROPODA. . PLBUEOXOHABIA COSONULA, Hall* ( n. sp.) PUTI IV. Fia. Q a b c < L Depressed troehiform, volutions about five, angular, slightly convex on the* upper side, and sloping almost uniformly from the suture to the margin; lower surface more rounded; aperture sub-quadrangular; striae bent abruptly backward on the acute outer |
