SCOTT : LITOPTERNA OF THE SANTA CRUZ BEDS. 



47 



Measurements. 



My, length 015 M^, width 013 



" width 012 Mj, length 020 



Mg, length 016 " width 012 



Locality. — Not given. 



LiCAPHRiUM PROxiMUM Ameghino. 



(Plate VII, Figs. Q-ya.) 



Licaphrmm proximzini Amegh.; Anales del Mus. Nac. de Buenos Aires, 

 Ser. 3, T. Ill, p. 469. 



Of this species I have seen only the casts, which I owe to the kindness 

 of Dr. Ameghino. The type-specimen is a fragment of the right maxillary 

 containing m- and - and accompanying it is a separate m- of the left side; 

 the second specimen is part of the right ramus mandibuli, with all the 

 molars and the last two premolars in place. Assuming that these are all 

 properly referable to the same species, the distinctness of that species is 

 indisputable. The third upper molar resembles that of L. pyramidatum 

 in having the protocone flattened on the inner side, but differs in the 

 presence of a minute, but distinct hypocone, which is but partly detached 

 from the prominent posterior cingulum. 



The lower teeth differ from those of the other species of Licaphrium 

 and resemble those of Proterothermm in their proportions, in the lack of 

 massiveness of the cusps and in the deep and widely open valleys. At 

 the same time, the propriety of referring this species to Licaphrmm is 

 made evident by the very large size of the postero-internal pillar and by 

 the talon of nig. All of the teeth preserved, with the exception of mg-, 

 have very broad posterior crescents, which bulge outward over the roots 

 in a very characteristic way. 



Mi, length {i. c, ant. -post, diam.) 



" width {i. f., transverse diameter) 

 M^, length 



" width 

 M3, length 



" width 

 P3, length 



" width 

 P5, length 



Locality. — Not given. 



Measurements. 



Pj, width . 



Lower molar series, length 

 My, length 

 " width 

 M. 



.014 

 .019 

 .016 

 .0205 



•013s 



.0215 



.0155 



.009 



.013 



M. 



L2, length . 



" width . 



^. length . 



' width . 



.0095 



■043 

 .012 

 .010 

 .014 



.Oil 



.0165 

 .0095 



