98 



CONTRIBUTIONS TO PAL^ONTOLOGY 



Platanaceae — continued 



Platanophyllum platanoides (Lesque- 

 reux) Dorf, n. comb. 

 Aristolochiacea; 

 Aristolochitesbrittoni (Knowlton) Dorf, 

 n. comb. 

 Lauraceae 



Laurophyllum coloradensis (Knowlton) 



Dorf, n. comb. 

 Laurophyllum meeki Dorf 

 Laurophyllum salicifolium (Lesque- 



reux) Dorf, n. comb. 

 Laurophyllum wardiana (Knowlton) 

 Dorf, n. comb. 

 Cercidiphyllaccse 



Cercidiphyllum arcticum (Heer) Brown 

 Cercidiphyllum ellipticum (Newberry) 

 Brown 

 Nyraphaeacose 

 Nelumbo tenuifolia (Lesquereux) 



Knowlton 

 Nymphseites browni Dorf, n. sp. 

 Nymphmtes daivsoni (Hollick) Dorf, n. 

 comb. 

 Menispermacese 



Menispermites belli Berry 

 Menispermites cockerelli (Knowlton) 



Dorf, n. corab. 

 Menispermites knightii Knowlton 

 Magnoliacese 



Magnoliophyllum cordatum Dorf 

 Anacardiacese 



Pistacia eriensis Knowlton 

 Vitacese 



Vilis stantoni (Knowlton) Brown 

 TiHacese 



Grewiopsis saportana Lesquereux 

 Dilleniacese 



Dillenites cleburni (Lesquereux) Dorf, 

 n. comb. 



Myrtacese 



Myrtophyllum torreyi (Lesquereux) 

 Dorf, n. comb. 

 AraUacese 



Aralisephyllum artocarpoides (Lesque- 

 reux) Dorf, n. corab. 

 Cornacese 



Cornophyllum wardii Dorf 

 Oleaceae 



Fraxinus leii Berry 

 Bignoniacese 



Dombeyopsis colgalensis Brown 



Dombeyopsis obtusa Lesquereux 



Dombeyopsis trivialis Lesquereux 

 Caprifoliaceae 



Viburyium marginatum Lesquereux 



Viburnum montanum Knowlton 

 Position uncertain 



Anona? robusta Lesquereux 



Apeibopsis? discolor (Lesquereux) Les- 

 quereux 



Celastrusl taurinensis Ward 



Cinnamormiml affine Lesquereux 



Cissus? lobato-crenata Lesquereux 



Ficusl ceratops Knowlton 



Ficus"! trinervis Knowlton 



Quercusl viburnifolia Lesquereux 



Rhamnus? mimdus Knowlton 



Trapal microphylla Lesquereux 



Phyllites trifoliatus Dorf, n. sp. 



Phyllites sp. 



Phyllites sp. 



Phyllites sp. 



Carpites lancensis Dorf, n. sp. 



Carpites ulmiformis Dorf, n. sp. 



Carpites verrucosus Le.squereux 



Carpites ivalcotti Dorf 



Carpites sp. 



Carpites sp. 



Palxoaster inquirenda Knowlton 



QUANTITATIVE ANALYSIS 



The dominant spccies of an assemblage may be said to include both those spe- 

 cies whose remains are most abundant and those whose remains are most persistently 

 present at the various horizons within the deposit. The most useful results of 

 quantitative studies are obtained from locaHties where several thousand specimens 

 can be collccted.' Unfortunately, none of the localitics in the Lance Creek area has 

 yielded more than 280 spccimens. Failure to securc largc collcctions is a result of 

 the Umited extent, both horizontally and vertically, of thc lenticular beds containing 

 the plant remains. 



At each locality quarrying was continued as long as the plant remains continued 

 to appear. Lcaf counts at Localitics P3853 and P3857 wcre madc in thc ficld, and 

 species not definitely identified were temporarily dcsignated by letters. AII the 



' Chaney, R. W., Amer. Jour. Sci., Sth ser., vol. 8, 127-144, 1925. 



