SCOTT : LITOPTERNA OF THE SANTA CRUZ BEDS. 



151 



Measurements. 



Ischium, length . 



.114 



Astragalus, width of trochlea. 



0415 



Femur, length from head 



•32s 



Metatarsal II, length . 



134 



" proximal width . 



.099 



" " proximal width 



019 



distal width 



•073 



" " thickness . 



031 



" thickness. 



.086 



" distal width . 



025 



Tibia, length with spine. 



.271 



" " " thickness 



026 



" proximal width . 



.081 



Metatarsal III, length . 



142 



" " thickness 



.077 



" " proximal width 



021 



" distal width. 



•053 



thickness. 



033 



" thickness . 



.044 



" " distal width . 



027 



Astragalus, length 



.058 



" " thickness 



02SS 



Localities. — The type (No. 15,164) was collected by Mr. Peterson ten 

 miles south of Coy Inlet and the jaw fragment with milk-teeth (No. 15,378) 

 which is probably referable to this species, was also found by Mr. Peterson 

 at the same place. 



Theosodon fontan^ Ameghino. 



Theosodoji Fontmice Amegh.; Rev. Argent, de Hist. Nat., T. I, 1891, p. 



294. 

 Oxyodontotheri^im Fontanel Lydekker ; Anales del Mus. de La Plata, T. 

 II, 1893, p. 67. 

 No specimens definitely referable to this species are contained in the 

 Princeton or New York collections. According to the original description, 

 T. fontancB is about the same size as T. lallemanti, but relatively more 

 robust ; the anterior part of the rostrum is shorter and broader ; the molars 

 are heavier and the incisors and premolars are set more closely together, 

 not so spaced apart. (Ameghino, loc. cit.) 



Theosodon gracilis Ameghino. 



(Plate XX, Figs, i, i«, 4, 8.) 



Theosodon gracilis Amegh.; Rev. Argent, de Hist. Nat., T. I, 1891, p. 



295- 

 Theosodon patagonensis Mercerat; Rev. del Mus. de La Plata, T. 11,1891, 



p. 48 [fide Ameghino). 



Theosodon debilis Mercerat; Ibid., p. 49 [fide Ameghino). 



Oxyodontotherium angustidens Lydekker; Anales del Mus. de La Plata, 



T. II, 1893, p. 69. 



This species is a little smaller than T. lallemanti and of more slender 



