. Bulletin. Science; Natural history; Natural history. NEW PLEISTOCENE COTTON RAT 81 acd. Fig. 1. Topography of a Sigmodon hispidus left first lower molar. BRA = buccal reentrant angle, LRA = lingual reentrant angle, acd = anteroconid, pro = protoconid, met = metaconid, hyp = hypoconid, ent = entoconid, post = posterior cingulum or posterolophid. Homologies of reentrant angles to folds, as published by Hershkovitz (1962) and others, are as follows: BRAl = major fold, BRA2 = first minor fold, LRAl = second primary fold, LRA2 = first primary fold, LRA3 = first secondary fold. provided for consis
. Bulletin. Science; Natural history; Natural history. NEW PLEISTOCENE COTTON RAT 81 acd. Fig. 1. Topography of a Sigmodon hispidus left first lower molar. BRA = buccal reentrant angle, LRA = lingual reentrant angle, acd = anteroconid, pro = protoconid, met = metaconid, hyp = hypoconid, ent = entoconid, post = posterior cingulum or posterolophid. Homologies of reentrant angles to folds, as published by Hershkovitz (1962) and others, are as follows: BRAl = major fold, BRA2 = first minor fold, LRAl = second primary fold, LRA2 = first primary fold, LRA3 = first secondary fold. provided for consistency (see Tomida 1987:103). Abbreviations are as follows: LACM = Los Angeles County Museum, MSU = Michigan State University, L = left, R = right, upper and lower molars (M) indicated by super- and subscript numbers, respectively. The term "zone" as used throughout this paper refers to a specific collecting horizon (level) of Downs and White (1968) in the Vallecito- Fish Creek sediments. Systematic Paleontology Order Rodentia Bowdich, 1821 Family Cricetidae Rochebrune, 1883 Sigmodon Say and Ord, 1825 Sigmodon lindsayi, new species \.\CM 124161, LM,, from zone (Locality LACM 1114). (Locality LACM 1114): LACM 124276, LM^; 124136, RM3; 124117, RM,; 3402, LM3; 124154, RM'; 124144, RM'; 124122, LM,; 124146, RM'; 124139, LM^; 124123, LM,; 124132, LM3; 124278, LM^; 124280, LM^; 124260, RM^; 124270, RM-; 124266, LM,; 124263, RM^; 124261, RM^; 124166, RM3; 124282, RM2; 124268, RM^; 124168, RM,; 124283, LM^; 124169,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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