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Show 129 Mandibles, with teeth of two spocies of this genus, were found, the smaller of which occurring with the other portions of C. furcatus, belong to it. The larger differs in the elevation of the iutercrescentic column of the first molar, which is worn into a loop at ordinary maturity ; this may, however, be but au individual variation. The diastema is long and the ramus of that point quite slender. Measurements. M. Long diameter of base, No. 1 016 Long diameter of base, No. 2 020 Elevation of first antler from base, No. 1 080 Elevation'of second antler from first, No. 3 042 Length of terminal part of beam, No. 4 .095 Length of molars 2- 5, No. 5 037 Length of molars 4- 5, No. 5 022 Length of fifth molar 012 Width of fifth molar 006 COSORYX TERES, sp. tlOV. Established on the connected frontal bones, supporting the horns of one specimen, and represented by portions of horns of two others. The former individual is larger thau any one belonging to the other species, and the species is doubtless the largest of the genus. The horns stand above the posterior part of the orbit, which excavates its base, and presenting a considerable face, descending into the temporal or zygomatic fossa. There is no free superciliary rim outside of the base as in C. ramosus, Cope. The section of the beam near the base is a regular oval; the long axis directed longitudinally and a little outward in front. The beam is erect, with a slight curvature outward at the iuner base only. So far as preserved, it does not branch, but may do # so in its distal portiou, which is lost. The tissue is more spongy interiorly than in ' the other species ; supraorbital forameu far within the superciliary border. Measurements, M. Outer width between bases of horn- cores 112 Inner width between bases of horn- cores 055 Width of temporal fossa behind horns 053 Long diameter of horn- core 028 Short diameter of horn- core 021 Length of part preserved 033 This species was as large as the Antilocapra americana of the plains. - HESPEROMYS LOXOPON, sp. nor. Ah entire mandibular ramus, with all the teeth preserved, was found in the same deposits as the preceding species. Molars subeqnal, short- crowned j triturating surface sigmoid. The apices of the sigrna on the inner side tubercular, and anterior to the outer apices. First molar with an additional transverse crest in front. Incisor compressed; outer angle of enamel face rounded smooth. Molar series oblique, rising anteriorly. Measurements. M. Length of molar series 0050 Length of first molar 0018 Depth below last molar, ( iuner side) 0030 Depth below first molar 0045 Depth of incisor 0015 Depth at diastema 0027 PANOLAX SANCT^ EFIDFI, gen. et sp. nor. Char. gen.- Molars prismatic, trausverse, except the first and last; each divided by a plate of enamel extending transversely from the inner side. Anterior molar longitudinal ; posterior molar composed of two columns. This genus is represented by numerous teeth and portions of the cranium. It evidently belonged to the Leporidm, and is allowed to both Lepus and Palwolagus. As the teeth are mostly separate, it is not easy to determine which is the posterior and which the anterior molar. Judging by the analogy of the known species, the determination as here made is correct; should the relations be reversed, the species will be referred to Palcuolagm. Char, specif.- The teeth are curved, the convexity inward. Inner face grooved, the groove occupied by cementum, the outer border compressed either without or with FF- 9 |
