. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1MM Figure 1. Stereophotograph of UCMP 136091, Batodon tenuis, maxillary fragment with M^ specimens, so that greater confidence could be expressed in their allocation to a single species. This paper perhaps may serve as a case study in the utility of func- tional association of isolated Mesozoic postcanine elements, an easy and yet of- ten-neglected method. Finally, we com- pare the estimated body mass of B. tenuis to those of other small eutherians and an- alyze hypotheses of its phylogenetic rela- tionships. MATERIA
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 1MM Figure 1. Stereophotograph of UCMP 136091, Batodon tenuis, maxillary fragment with M^ specimens, so that greater confidence could be expressed in their allocation to a single species. This paper perhaps may serve as a case study in the utility of func- tional association of isolated Mesozoic postcanine elements, an easy and yet of- ten-neglected method. Finally, we com- pare the estimated body mass of B. tenuis to those of other small eutherians and an- alyze hypotheses of its phylogenetic rela- tionships. MATERIALS AND METHODS Nomenclature Here we follow McKenna and Bell (1997) in formally recognizing Placentalia as the appropriate name for the clade that frequently is dubbed Eutheria. Informally, reflecting vernacular use, the terms euthe- rian and placentalian are recognized as synonyms. Provenance and History The new maxillaiy fragment, UCMP 136091, described here comes from con- centrates obtained in 1974 by screen wash- ing sedimentary rocks of the Hell Creek Formation at the Flat Creek Locality 5 (V- 73087) in Garfield County, Montana. Ar- chibald (1982: 166) described four isolated teeth of B. tenuis from this locality. The new specimen was discovered after he coinpleted his monographic study. Marsh (1892) established B. tenuis on a fragment of a dentary (USNM 2139) con- taining Po^ from the Lance Formation, Ni- obrara County, Wyoming. The type locality is UCMP locality no. V-5003 (Clemens, 1973), also referred to as Mammal locality no. 1 (Lull, 1915). Additional specimens of B. tenuis have been reported from Lancian North American Land Mammal Age (NALMA) local faunas of the Lance For- mation, Wyoming (Clemens, 1973); the Scollard Formation, Alberta (Lillegraven, 1969); the Hell Creek Formation, Mon- tana (Archibald, 1982); and the French- man Formation, Saskatchewan (Storer, 1991). A boundary between the Lancian NAL- MA and the older, still poorly character- ized "Edmonton
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