148 UNGTTLATA. 



affinity of the North- American Pliauchenia (Pm. |) and Procamelus 

 (Pm. ^). For Auchenia magna, see Addenda. 



Auchenia, sp. 1. 



In the absence of figures, it appears impossible to say whether the 

 present form is identical with any of the numerous fossil species 

 recorded by H. Gervais and Ameghino (op. cit. pp. 115-123). The 

 present form is considerably larger than the Guanaco. 



Hob. S. America. 



18921. Fragment of the right maxilla, showing the five cheek-teeth ; 



from a cavern in Minas Geraes, Brazil. It is possible that 

 a minute pm. 2 may have been present ; pm. 3 is relatively 

 much larger than in the Guanaco. The following mea- 

 surements indicate the difference in size of the fossil and 

 recent forms : 



Fossil. Keceiit. 

 Length of space occupied by three true molars . . 0,072 0,061 



Ditto by two premolars 0,034 0,021 



Length of pm. 3 0,016 0,0085 



Claussen Collection. Purchased, 1845. 



18920. The anterior part of the palate, showing the canine and in- 

 cisor ; from a cavern in Minas Geraes. 



Claussen Collection. Purchased, 1845. 



18922. Two lower true molars ; from a cavern in Minas Geraes. 



Claussen Collection. Purchased, 1845. 



37665 . Part of the left ramus and symphysis of the mandible of a 

 young individual, agreeing in size with the preceding, and 

 showing mm. 3, mm. 4, and m. 1 in alveolo ; from the 

 Pleistocene of Buenos Ayres. 



Bravard Collection. Purchased, 1854. 



The following limb-bones agree in siz( with this species. 

 37656. The right radius and 'ulna, imperfect distally; from the 

 Pleistocene of Buenos Ayres. 



Bravard Collection. Purchased, 1854. 

 18934. The right carpus ; from a cavern in Minas Geraes. 



Claussen Collection. Purchased, 1845. 

 18926. The left metacarpus ; from a cavern in Minas Geraes. 



Claussen Collection. Purchased, 1845. 

 37661. The left metatarsus ; from the Pleistocene of Buenos Ayres. 



Bravard Collection. Purchased, 1854. 



