25 



832. Ammonites novimexicanus, Marcou. Tex. ; N. M. 



833. Ammonites opalis, Oivoi. Dak. 



834. Ammonites pedernalis, Voi Buck. Tex. 



835. Ammonites percarinatus, Ilall <J- Meek. Neb. ; Dak. ; Id. ; N. M. 

 83(i. Ammonites peruvianus, VonBiuh? Tex 



837. Ammonites placenta, /A'A'(/.y. N. J. ; Del. ; Ala. ; Miss. ; Ten. ; N. M 



838. Ammonites placenta, rar. intercalaris, Meek ^- Uaydcn. Dak. 



839. Ammonites pleuricepta, Conr. Tex. 



840. Ammonites ramosus, Meek. Vane. I. 



841. Ammonites ramosissimus. Tuomey. Ala. 



842. Ammonites [?] reconditus, Galeotti. Mex. 



843. Ammonites Rioii, Galeotti. Mex. 



844. Ammonites Shumardi, Marcou. Tex. 



845. Ammonites Sillimani, Z^'Orft. Id.? 

 84l!. Ammonites Swallovii, Shumard. Tex. 



847. Ammonites syrtalis, Morton. Ala. 



848. Ammonites Tuomeyi, Gabb. Ala. 



849. Ammonites vancouverensis, Meek. Vane. I. 



850. Ammonites vespertinus, Morton. Ark. ; Ind. T. ; N. M. ; lud. 



T. ; Tex. 



851. Helicoceras Conradi, (Morton) Gabb. N. J. 



852. Helicoceras cochleatum. Meek ^- Hayden. Dak. 



853. Helicoceras navarroensis, Shumard. Tex. 



854. Helicoceras Mortoni, (//«// ^- Meek) Meek ^- Hayden. Dak. 



855. Helicoceras ? tennicostatum, J/fe/.- ^- iZ«^(/e«. Dak. 



856. Helicoceras ? nebrascensis, 3/ecA- <J- i/a^^/en. Dak. 



857. Helicoceras ? umbilicatimijil/ceA; Sf Hayden. Dak. 



858. Heteroceras Oweni, Meek. Ark. 



859. Heteroceras tortum, (Meek cj- Hayden) Meek. Dak. 



860. Heteroceras ? angulatum, {Meek Sj- Hayden) Meek. Dak. 



861. Heteroceras ? cheyennensis, (Meek ^' Hayden) Meek. Dak. 



862. Turrilites attenuatus, Tuomey. . Ala. 



863. Turrilites brazoensis, Roemer. Tex, 



864. Turrilites helicinus, Shumard. Tex. 



865. Turrilites spiniferus, Conr. Ala. 



866. Turrilites splendidus, Shumard. Tex. 



IVautilidae. 



867. Nautilus angulus, Tuomey. Ala. 



868. Nautilus Campbelli, Meek. Vane. I. 



869. Nautilus DeKayi, Morton. N. J. ; Del. ; Ala. ; Miss. ; Ten. ; Ark. ; 



Tex. ; Neb. ; Id. ; Brit. Am. 



870. Nautilus elegans, Sowerby ? Tex. ; Id. 



871. Nautilus elegans, var. nebrascensis, Meek & Hayden. Id. 



872. Nautilus Spillmani, Tuomey. Ala. 



873. Nautilus texanus, Shumard. Tex. 



874. ? Aturia orbiculata, ( Tuomey) Meek. Ala. 



