. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PLD HYD MED MLD END MED MLD END MSFD/ MTFD I / MSFDJ MTFD PLD. HFD Figure 2. Nomenclature of parts of caviomorph lower cheek teeth. Anterior ends of all teeth to the left. A. Migraveramus beatus, RP^-M,, reversed. B. Incamys bolivianus, LP4. C. Incamys bolivianus, LN^j. Abbreviations: ACD—anteroconid; AFD—anterofossettid; ALD—anterolophid; ECTD—ectolophid; END—entoconid; HFD—hypoflexid; HYD—hypoconid; MED—metaconid; MLD—metalophid or metalophulid II; MSFD—mesoflexid; MTFD—metaflexid or metafossettid; PLD—posterolophid
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PLD HYD MED MLD END MED MLD END MSFD/ MTFD I / MSFDJ MTFD PLD. HFD Figure 2. Nomenclature of parts of caviomorph lower cheek teeth. Anterior ends of all teeth to the left. A. Migraveramus beatus, RP^-M,, reversed. B. Incamys bolivianus, LP4. C. Incamys bolivianus, LN^j. Abbreviations: ACD—anteroconid; AFD—anterofossettid; ALD—anterolophid; ECTD—ectolophid; END—entoconid; HFD—hypoflexid; HYD—hypoconid; MED—metaconid; MLD—metalophid or metalophulid II; MSFD—mesoflexid; MTFD—metaflexid or metafossettid; PLD—posterolophid; PRD—protoconid. Flexids are unworn valleys that become fossettids with wear. allocate their three new genera from Sal- la to families. Hartenberger (1975) placed Sallamijs in the Octodontoidea, Incamys in the Chinchilloidea, and Branisamys, with a query, in the Dinomyidae. We had independently arrived at broadly similar conclusions (cf Patterson and Pascual, 1972: 278), and present evidence in the following pages that Sallamys was a member of the Echimyidae, Incamys of the Dasyproctidae, and Branisamys of the Dinomyidae—without query. A new genus, Migraveramus, is referred to the Octodontidae. One specimen of Lavo- cat's hypodigm of Incamys bolivianus represents, we believe, an undescribed dasyproctid genus. Salla thus adds a fam- ily to the six previously represented in the Deseadan. In 1959 we inadvertently cited seven families on page 389, thus contradicting our correct statement on page 284 (with Lavocat, we are unable to agree that Hartenberger's Villarroelomys is referable to the Hydrochoeridae). La- vocat (1976) also placed Sallamys in the Echimyidae and Incamys in the Dasy- proctidae, but erred, we believe, in also including Branisamys in that family. Hoffstetter and Lavocat (1970), on the basis of some points of similarity in cheek tooth structure between these fomis and the approximately contemporaneous Fa- yum rodents, favor descent of c
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