SCOTT : LITOPTERNA OF THE SANTA CRUZ BEDS. 



71 



is slender and procumbent, doubtless an indication that the animal was a 

 female. All of the teeth, from is backward, are closely crowded together 

 and without diastemata, which is the diagnostic feature of the species. 

 The single complete tooth, p4, measures 12.5 mm. in antero-posterior, by 

 9.5 mm. in transverse diameter, and the depth of the mandible below p- 

 is 19.5 mm. 



The type of Licaphrium proclivum is the right horizontal ramus of a 

 mandible with all of the teeth, except the median incisor and the canine, 

 in place, and appears to have been a slightly smaller animal than the pre- 

 ceding individual. The lower tusk (ig) is much larger and more erect 

 than in the latter, but this is probably merely a sexual difference. The 

 alveolus of the missing canine is almost in contact with those of \^ and py, 

 and the latter, which is small, extensively overlaps the anterior border of p^- 



In the table, the measurements are taken from a cast of the type of L. 

 proclivtim. 



.008 



.0115 



.010 



.038 



.011 



.010 



.0125 



.010 



•013s 

 .0095 





Measurements. 



Lower dentition, length ig-nig 



.092 



Pj, width . 



I5, antero-posterior diameter . 



.008 



P^, length . 



" transverse " 



.005 



" width . 



Lower premolar-molar series, length 



.077 



Lower molar series, length 



" premolar series, length 



■039 



My, length . 



Pj-, length (/. e., ant. -post, diam.) . 



.0075 



" width . 



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



.003 



Mg, length . 



Pg, length 



.0105 



" width . 



" width 



.005 



Mj, length . 



Pj, length 



.012 



" width . 



Localities. — Not given. 



Proterotherium intermedium Ameghino. 



(Plates VIII, Figs. 4, 4«; X, Figs. 7, 9, 10.) 



ProterotJiernim intermedium Amegh.; Enum. Synopt., etc., 1894, p. 38. 



The type of this species (PI. X, fig. 7), is the right horizontal ramus 

 mandibuli of an old individual, with the anterior teeth badly broken. A 

 specimen in the collection of the American Museum (No. 9267, PI. X, figs. 

 9, 10) consisting of the facial region of a skull and associated lower jaw, and 

 a young mandible in the Princeton collection (No. 15,996, PI. VIII, figs. 

 4, 4«), appear to be referable to the same species. The posterior upper 

 premolars, p- and -, are intermediate in type between those of P. atistrale 



