LÖNNBERG, NOTES ON GUANACOS. 



and the vertical parts of ossa palatina forming together with 

 the pterygoids the walls of the choanse are parallel with each 

 other, so that the posterior palatal opening has the shape of a 

 greatly extended U (conf. fig. 1). In the Patagonian Guanaco 

 the incisure in the posterior palate is narrower in front than 

 behind, even if it is rounded, but sometimes it is pointed, and 



Fig. 1. Palatal aspect of a skull of 

 the small Peruvian Guanaco. 



Fig. 2. Palatal aspect of the skull 

 of the Patagonian Guanaco. 



the vertical walls of the choanse are diverging backwards so 

 that the general shape of the posterior palatal opening is that 

 of a V (conf. fig. 2), even if the anterior end is somewhat 

 rouncled off, as is already mentioned. In this respect the small 

 Peruvian Guanaco with its parallel palatal walls resembles 

 L. vicugna. 



The bulla? appear to be comparatively more inflated in 



