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Show 412 APPENDIX E.- PALEOBIOLOGY, OBTHIS UMBRAOULUM? ^ • FLAM HL FJQ. 6. The specimen eorresponds With one from the carboniferous xocks of Kentucky and Tennessee, which is referred to this species. It is however somewhat distorted by. pressure, and other » specimens . ^ are neoessary for a full determination. * Loc. Missouri River, above Fort Leavenworth. ACEPBALA. . • ATICULA? CUSTA. PLATE TV. Fioi i a-' b. . Shell obliquely ovoid.; hinge " line touch . shorter than the width * of the shell; beaks prominent, and the. upper part of the shell gibbous; surface marked by'fine eyen striae. This Bhell . occurs, with a few other fossils, in thinly laminated . gray sandstone, whi$ h, judging from the notes of observation^ lies below the limestone of Fcftt Laramie. ^'.. . • . ' - • . ' ' « ' - ' • •• - - A T^ LUNOMYA PJLOTJCNSA, IJall, ( n, Sp.) . .. P u n IV. fito. 8. ' • Shell elortgate- oval; beaks placed, about one- third the widfh of . the'shell from the anterior extremity, somewhat pointed; surface ' marked by fine concentric stride and some stronger libps of growth/ - Loo. near Le Bonte, with the preceding species. CYPilOAKDIA OCCIMNtALIS. . . > •£ fun IV. FJO. 2. Shell rhomboidrovate; anterior extremity rounded^ posterior-obliquely truncate; posterior slepe* with a dis$ ipet carina extending from; the back to the posterior basal margin; beak near the anterior extremity; Surface marked by concentric striae and some more elevated ridges or lines of growth,' * , - This species occurs in a' gray argillaoeotw limestone, associated with jProducHu, Chonetes, etc; Loc. from the Big Blup River. |
