1 9 1 



American Deer 



than six tines, of which all but one are on the front edge. The whole 

 antler is much flattened, and has its main fork only a short distance above 

 the burr. It is a much more complicated type than that of the existing 

 marsh-deer ; and indicates that the symmetrically dichotomous form of the 



latter is a feature of no very great 



structural importance. 



Distribution. — Argentina during the 

 J Plistocene period 



4. The Buenos Aires Marsh-Deer — 

 Mazama ultra (Extinct) 



Cervus ultra, Ameghino, Diagnosis 

 Mam. Fos. Neuv. p. 14 (1888). 



Antjfer ultra, Ameghino, Mam. Fos. 

 Repub. Argent, p. 610, plate xxxviii, 

 fig. 2 (1889). 



Cariacus ultra, Lydekker, An. Mus. 

 La Plata — Pal. Argent, vol. ii. p. 83 



(■893)- 



Characters. — This species, which 

 forms the type of the genus Antifer, 

 and was founded upon part of a left 

 antler from the Plistocene formation 

 of Buenos Aires, appears to have been 

 allied to the marsh-deer, although of 

 considerably larger size, and with the 

 antlers much flattened. The antler 

 forks in the usual dichotomous manner ; the hinder tine of the terminal 

 fork of the posterior branch of the main fork is again divided, but the 

 front tine of the same is simple. The fragment of an antler on which the 

 genus TLpieuryceros was based appears to be merely the basal portion of an 

 old antler of the present species; and if this be so, the main bifurcation 

 took place nearer to the burr than is the case in the living marsh-deer. 



Fig. 77. — Inner view of Left Antler of" Lujan 

 Marsh-Deer. From a specimen in the La 

 Plata Museum. 



Distribution. — Argentina during the Plistocene epoch. 



