144 



PATAGONIAN EXPEDITIONS: PALEONTOLOGY. 



Upper milk-premolar series, length. 



.074 



Dp3, width . 



.017 



Dpi, length (i. e., ant. -post, diam.) 



.013 



DpA, length 



.022 



" width {i. ?., greatest trans, diam.) 



.007 



" width . 



.0195 



Dp^, length .... 



.0195 



Ml, length . 



.024 



" width 



.015 



" width . 



.0223 



Dpi, length .... 



.019 



IT /■■XT. 1TT'. 



1 ■ 1 



In the collection of the American Museum of Natural History is a hind 

 foot (No. 9219), lacking the calcaneum, astragalus and navicular, which 

 is apparently referable to this species. The specimen is figured in PL 

 XX, fig. 7, with the missing parts supplied from other individuals. In 

 one respect this foot is manifestly abnormal (not shown in the drawing) 

 namely, in the disproportionate width of the distal end of metatarsal III 

 and the adjoining part of the first phalanx. This width is undoubtedly 

 due to disease or accident in the lifetime of the animal. 



Metatarsal II, length . 



•134 



it 



" proximal width 



.020 



n 



thickness 



.032 



ft 



" distal width . 



.029 



li 



" " thickness 



.029 



Metatarsal III, length . 



.146 



a 



" proximal width 



.023 



ft 



thickness 



•03s 



tt 



" distal width . 



.040* 



a 



" " thickness 



.029* 



Metatarsal IV, length . 



.127 



tt 



" proximal width 



.024 



tt 



thickness 



.034 



tt 



" distal width . 



.028 



tt 



" thickness 



.028 



Phalanx 



I, digit II, length . 



.054 



tt 



I, " " prox. width 



.029 



tt 



I, " " " thicknes 



5 .021 



Phalanx i, digit II, distal thickness 

 " 2, " " length . 

 " 2, " " prox. width 

 " 2, " " " thickness 

 " 2, " " dist. width 



Ungual phalanx, digit II, prox. width 

 " " dist. width, 



Phalanx i, digit III, length . 

 " I, " " prox. width 

 " I, " " " thickness 

 I, " " distal width 



Phalanx 2, digit III, length . ■ 

 " 2, " " prox. width 

 " 2, " " dist. width 



Phalanx i, digit IV, prox. width 

 I, " " dist. width 



Phalanx 2, digit IV, length . 

 " 2, " " prox. width 



* 



.016 



•037 

 .027 

 .022 

 .025 

 .022 

 .030 

 .057 



■039 



.028* 



.024 



•034 

 .025 

 .022 

 .029 

 .023 



•033 

 .025 



* Pathological. 



Localities. — Not given for type. No. 15,717 was collected by Mr. 

 Peterson 10 miles south of Coy Inlet. 



Theosodon lallemanti Mercerat. 



(Plates XVII, Fig. 4 ; XVIII, Figs, i, i«, 3, 3«, 7, 9 ; XIX, Fig. i ; XX, Figs. 3, 3«.) 



Theosodon lallemanti M.exctr2ii ; Rev. del Mus. de La Plata, T. II, 1891, 

 p. 48. 



