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Paratype 15902 . . . . . . . . . . . . . . . . . . 0 55 8s 98 REMARKS: Thi41 species is similar to Microconthoceras agua6tense Imlay but is &stinguished by a more rapid rate of coiling, weaker tuberculation, a less distinct ventmf depremion, fewer simple ribs, and a relatively higher whorl section. T y p ~ :Bolotype m7; p-types 20048, 20049, 15902, Museum of PalmntoIw, University of Michigan. mv~~te~a: La Casita formation (Substwerocercrs M 4 ) . fielh~m's collectSons 5 and 25 in Caiicin Alamo, Siem de Jimulco, Coahuilzt.

1, 2, 4, 5 ) . SI~WIMENS: 16977, 16978, 16980, Museum of Paleontology, University of Michigan. @ ~ ~ R ~ . : N C ELa : Casita formation (Torqtratisphinctes beds). Locality 57 in the Sierra de Parras, Corihuila. Aulacosphinctoides? aff. diversecostatus (Burckhardt) (Plate 10, figure 7) 1919. Perisphinctes (Aulacosphinctes) diversecostatus BURCKHARDT, Inst. Geol. , ntim. 33, p. 34; 1921, pi. 12, figs. 1, 2, 4, 5. REMARKS: The figured specimen has been considerably mashed but illustratm how much the appearance varies with the preservation.

20053.. . . . . . . . . . . . . . . . . . . . 200XI . . . . . . . . . . . . . . . . . . . . . Q REMARKS: This species may be distinguished from S. alticostatum Imlay by its more compressed whorl section, closer-spaced ribbing on its inner whorls, and by i ~ s greater number of simple ribs. 8, kellumi Imlay hm h e r , closer-qacd ribbiw, and fewer simple ribs. The immature form of S. intercostaturn (Steuer) (lw,p, 46, pi. XXII, figs. 4-5) shows some resemblances but is more involute and hm s distinct ventral furrow.

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