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Show 4 1 4 A? f> B* DIX B.- PAI^ BOJTTOLCKJY. edge of the last volution, which has scarcely a, distinct carina; tipper margin of the volution^,' along the suture, marked by an elevated nodulose ridge, giving a beautiful coronate feature to the . upper part of the shelL Umbilicus, none. " \- Fig., 6 a, view of. the upper surface of the shell. Pig. 6 . b, view af the aperture, which ii imperfect. , . Fig, 6 o, anterior vie^ of the shell. Fig, # d, base of the shell. / This beautiful species wag found with other carboniferous fossil*. EUOM^ HALUS SUBPLAJrtJS, Halls ( n. « p.) ~ [ PhAir* IV. FiG. 7* ab; ' • Spiral, convolute; volutions about five, in contact, round, or very obtusely sub- angular on the upper outer margin of old specimens^ surface evenly striated. * . . . .. In young specimens, the apex is depressed, but in the specimen figured it is slightly above the outer volutiofe. Thtf specinie* fig: 7 b is the under side- of . a cast of an individual of apparently the same* species, the absence of the shell leaving the volution* not in contact. » •' . - • " l * Figc 7 a, view of the upper side of a specimen from limestone on the top of Stansbury's Island, Great Salt Lake. \ '•• Fig. 7 b, a cast in limestomV from betweeh the Big and Little . Blue Rivers. '*•< . * - |