. The Deseado formation of Patagonia . size. Notogale tenuis Ameghino ? temiis Amegh., 1897, Bol. Inst. Geog., Argen., 1. 18, p. 504. This species was founded by Ameghino on a single lowerpremolar 3 which is 3 mm. in length. No further descrip-tion is given and no figure. Proborhyaena Ameghino Proborhyaena Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 501. The genus is founded on a large lower jaw carrying thecanine and premolars 3 and 4 and roots or alveoli for theother teeth. It is the largest carnivor recorded fromPatagonia, and as large as a small bear. It is not possible
. The Deseado formation of Patagonia . size. Notogale tenuis Ameghino ? temiis Amegh., 1897, Bol. Inst. Geog., Argen., 1. 18, p. 504. This species was founded by Ameghino on a single lowerpremolar 3 which is 3 mm. in length. No further descrip-tion is given and no figure. Proborhyaena Ameghino Proborhyaena Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 501. The genus is founded on a large lower jaw carrying thecanine and premolars 3 and 4 and roots or alveoli for theother teeth. It is the largest carnivor recorded fromPatagonia, and as large as a small bear. It is not possible 2l8 THE DESEADO FORMATION OF PATAGONIA to place Its exact relationships, for the most essential teethare wanting, but it is certainly a distinct genus as indicatedby the reduced size of premolar 4 and the plump characterof the teeth. Proborhyaena gigantea Ameghino p. gigantea Aniegli., 1897, Bol. Inst. Geog. Argen., t. 18, p. 501. We found no specimens of this great carnivor, so I amreproducing Ameghinos figure and measurements. The. Fig. 144. Right mandibli -1/_ natural size, after Ameghino. heavy canine is channeled on the sides and much worn onthe posterior face. Premolar 3 is a plump tooth, its crownconsisting mostly of a single median cusp, but with a smallheel behind, and, strikingly enough, premolar 4 is a smallerand simpler tooth with a single cusp. Measurements Lower dentition, canine, antero-poslerior diameterLower dentition, canine, transverse diameterLower dentition, premolar ,1 to molar 3Lower dentition, height of mandible under pm. 4 30 mm. 20 mm. 145 mm. Co mm. CAENOLESTIDAE 219 Proborhyaena antiqua Ameghino ? Borhyaena antiqua Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. antiqua Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 502. ihis species is known only by a vsingle canine 100 , of which but 15 mm. belongs to the crown. Itsantero-[)osterior diameter is 14 mm., the transverse 12 seems to me very doubtful whether this is a
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