i 



PLATE XXIIIc. 



The figures represent parts of Mammalia from the Puerco Eocene, of the natural size. 



Figs. 1-'). — Catopsalis polliix. Page 734. 



Fig. 1 — Riglit inaiidilmlar niiiius lacking the po.sterior parts, and with the anterior extremity of the 



first true molar brolien oft'; external view ; a, internal view ; b, superior view ; c, inferior view. 

 Fig. 2. — Proximal caudal vertebra, left side ; «, anterior view. 

 Fig. 3. — Distal part of humerus, posterior side ; «, anterior side. 

 Fig. 4. — Ulna, inner side ; a, superior view. 

 Fig. 5. — Right astragalus, superior view ; a, external view. 

 Fig. 0. — Polymaslodoii taoeiiais. Superior view of last two molars. Page 732. This may represent the 



maxillary dentition of Catopsalis jyoUiix. 

 Figs. 7-12. — Hemigaviis viilUiomm. Separate teeth of two individuals, represented resjiectively by figs. 



7-10 and 11-12. 

 Fig. 7.— Superior molar, lateral view ; a, externiil ; 6, inferior views. 

 Fig. 8. — 1 Superior incisor, lateral view. 



Fig. 9. — Inferior incisor, anterior view; a, inner side ; b, exterior side. 

 Fig. 10. — Middle inferior incisor, lateral view; a, anterior view. 

 Fig. 11. — Inferior molar of No. 2 side ; a, crown from below. 

 Fig. 12. — Inferior molar of same, with a, lateral views ; b, superior view. 



As these specimens were received too late to permit their description in the text of this work, I 

 discribe them here. The original description appeared in the American Naturalist, 1862, p. 831. 



Char, jen.— This genus is probably a Tteniodont, and allied to Calamodon, but the absence of the 

 canine teeth renders the determination incomplete. The incisors, while of the form of those of Cala- 

 modon, had a limited period of growth, and the root displays a contracted base. The enamel also 

 extends but a short distance on the anterior face of the tooth. The probable first inferior incisors are 

 quite small, but are generally like the second or large ones. The superior molars have but a single 

 conic root, but in some of them a fissure of the external side marks the usual place of division. The 

 crowns are narrow and transverse to the axis of the jaw. 



Char, specif. — Large incisors strongly curved, robust, wearing with a strong posterior shoulder. 

 Shaft with the dentine finely and sharply ridged. Inferior apex compressed ; front regularly rounded. 

 Enamel ? ridged or smooth. Superior molars with narrowed transverse crowns, and roots covered with 

 a thin layer of ceuientum. There are one, perhaps two external cusps, but the crowns are all much 

 worn. One crown, jterliaps inferior, is sub-roun<l with a notch, as in Calamodon sp. Enamel short, 

 with equal base, smooth. Length of first incisor, .026; diameter of crown, anteroposterior, .008; 

 transverse, .014. Length of second incisor, .094; diameters of crown, anteroposterior, .029; tr.ansverse, 

 .019. Length superior molar, .0225; diameters crown, anteroposterior, .010; transverse, .017. Diam- 

 eter inferior molar (second specimen), anteroposterior, .011 ; transverse, .011. Discovered by D. Bald- 

 win in New Mexico. The species is a little larger than the Psittacotheriiim multi/ragum. — £. JJ. Cope. 



