. The Deseado formation of Patagonia . edingpremolars and molars being large and divided into two lobesby a deep external, and a shallow internal infolding. Measurements Skull, width Ixlween (In- oiI)ilsSkull, width across the postorhital processesSkull, height from m. 2 to top of frontalSkull, width of palate opposite inc. 2Skull, width of palate opposite m. 2Dentition, Dentition, incisor i ant.—, pm. 3Dentition, m. 26 length inc. i (o ni. 3length II II 22 mm. 60 mm. 88 mm. 77 mm. 42 mm. 62 mm. 140 mm. width 16 mm. width 13 mm. width 16 mm. 82 THE DESEADO FOR
. The Deseado formation of Patagonia . edingpremolars and molars being large and divided into two lobesby a deep external, and a shallow internal infolding. Measurements Skull, width Ixlween (In- oiI)ilsSkull, width across the postorhital processesSkull, height from m. 2 to top of frontalSkull, width of palate opposite inc. 2Skull, width of palate opposite m. 2Dentition, Dentition, incisor i ant.—, pm. 3Dentition, m. 26 length inc. i (o ni. 3length II II 22 mm. 60 mm. 88 mm. 77 mm. 42 mm. 62 mm. 140 mm. width 16 mm. width 13 mm. width 16 mm. 82 THE DESEADO FORMATION OF PATAGONIA Eutrachytherus conturbatus A meg hi no Trachytherus conturbatus Amegh., 1895, Bol. Ins(. Gcog. Argcn., t. 15, p. conturbatus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, This species is founded on upper teeth, which are saidto be relatively smaller anteriorly, and actually smallerthroughout, by about 15% than are those of the precedingspecies. Molar i measures 17 mm. long by 9 mm. Fig. 49. E. grandis, molars of the left side—natural size. Eutrachytherus grandis si), species is based on upper molars i and 2 of the left side, from the Deseado beds, of the Chico del Chubut, west of Puerto teeth are typicallythose of the genus anddiffer only from otherspecies in their largesize, being some 50%larger than the corre-sponding teeth of E. spegazzinianus. Each is covered with a layer of fully half a millimeter of cement. Measiirements upper molar i, length 29 mm., width 21 molar 2, length 30^ mm., width 18 mm. Argyrohyrax Ameghino Argyrohyrax Amegh., 1897, Ro- Ist. Geog. Argen., t. 18, p. 435. The genus is distinguished by the full dentition in closedseries, and by the upper molars haxing a deep internalinflexion which is bifurcated, making the teeth at leastincipiently three-lobed. Incisor I is relatively somewhatwider than in the preceding genus. It seems to me thatit is from such a genus that Typot
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Keywords: ., bookcentury1900, bookdecade1910, bookpub, booksubjectpaleontology
