. Bulletin - United States National Museum. Science. NEW SPECIES OF EXTINCT MIOCBN® SIEEINilA THE SOUTH CAROLINA MIOCENE DUGONG 91 DIOPLOTHERIUM MANIGAULTI Cope The mammalian fossil specimens obtained during the phos- phate dredging operations on the Wando, Ashley, and other rivers in South Carolina unquestionably were derived from overlying deposits of successive geological ages, seemingly extending in time from the upper Eocene to the Pleistocene. Included among such specimens are teeth and cranial fragments of the upper Eocene archaeocete Dorudon serratus. Pleistocene land mammals are repre
. Bulletin - United States National Museum. Science. NEW SPECIES OF EXTINCT MIOCBN® SIEEINilA THE SOUTH CAROLINA MIOCENE DUGONG 91 DIOPLOTHERIUM MANIGAULTI Cope The mammalian fossil specimens obtained during the phos- phate dredging operations on the Wando, Ashley, and other rivers in South Carolina unquestionably were derived from overlying deposits of successive geological ages, seemingly extending in time from the upper Eocene to the Pleistocene. Included among such specimens are teeth and cranial fragments of the upper Eocene archaeocete Dorudon serratus. Pleistocene land mammals are represented by Megatherium, Elephas, Equus, Tapirus, Procamelus, Bison, and Castoroides. Some, at least, of the varied assortment of beaked whale or ziphioid rostra, including Choneziphius, Eboroziphius, Dio- plodon, and Proroziphius, are thought to have been in existence in Carolina coastal waters in the Miocene, as well as the shark toothed porpoise Squalodon. Hence proper caution is required in the appraisal of the age of the sirenian fossils. The small cranial specimens representing the dorsal por- tion of the braincase, which Glover Allen (1926, p. 455, pi. 2, figs. 1-2) identified £is Halitherium antiquum (Leidy) and Simpson (1932a, p. 445) as Halitherium alleni are con- sidered here to possess features characteristic of either Felsinotherium or Metaxytherium. At least one cranial roof (USNM 23394) is sufficiently complete to show that the nasal bones are separated medially by the forward pro- jection of the paired frontal bones. The least parietal width of this specimen is 60 mm. The cranial roof (fig. 38) of this specimen corresponds rather closely in its dimensions vnth the skull of the lower Pliocene (Plaisancian) Felsino- therium serresii (Deperet and Roman, 1920, p. 6; fig. lb; pi. 2, fig. lb). Braincase roofs, having similar dimensions and configu- rations, demonstrate the variable degree of convergence of temporal crests. Among ten specimens recovered by dredging the
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