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into them, Consequently the opening of the nose is kidney-shaped, 
with the convexity. to the outside. The cartilaginous nose consists of 
the two cartilagines alares and the cartilago triangularis. The cartilago 
alaris is a rather broad, shell-shaped cartilage blade, surrounding the 
nostril at the top, medially and orally. The dorsal, lateral angle of 
the cartilago alaris is continued in the processus navicularis. If we 
prepare the median parietis of the cartt. alares separately and spread 
them out, we can follow the downward extremity of the cartilago 
triangularis that is continued in the foremost edge of the septum. 
The septum does uot protrude free from between the cartt. alares. The 
proportions of Chrysothrix and Hapale are exactly like those of Cebus. 
The form and composition of the cartilaginous nose of Plathyrrhini 
can easily be derived from its form in the embryo. There it is the 
uninterrupted continuation of the internal nose, its frontal termination. 
The septum is gradually transformed into two cartilaginous blades, 
which at the top medially and orally limit the nostrils. In older 
foetal stages both the cartt. alares and the cartilago triangularis take 
their origin from these blades. 
The slight prominence of the nose of Platyrrhini (DesMAREST) is 
caused by a slight protuberance of the region of each nostril separately. 
By their boundary the nostrils are more independent and wider 
open than those of Catarrhines; the cartt. alares are thicker. There 
is a sharp oral boundary of the nostril with regard to the upper-lip. 
The external nose of Catharrini, as e.g. of Macacus, M. sinicus, 
M. rhesus is characterized by a small distantia internarina and down- 
ward directed nostrils. Instead of a fossa internarina a sulcus 
interalaris is often found here. The nostrils are in the direction of the 
lips not separated from these. They lie at the distal end of the cartt. 
alares and are enclosed by the latter only medially and not at the 
inferior side; therefore there is, between the two nostrils, a free 
duplicature of the skin, a septum mobile, that extends more or less on 
the upper-lip and forms here a slight protuberance. In the septum 
mobile a projecting part of the cartilago alaris, crus mediale, extends ; 
I found this likewise in microscopic preparations of the full-grown 
nose. The region of the cartt. alares is often a little arched, as if 
it were inflated. The nostrils are narrow oval and long, the two 
rims almost touch each other, also on account of the thinness and 
flabbiness of the cartt. alares. Medially the beginning of the processus 
navicularis arches into the opening of the nose from the maxillotur- 
binale, which originates from the upper part of the cartt. alares. 
The cartt. alares are narrower and less curved than those of Platyr- 
rhini; they run pretty well parallel. The sulcus supraseptalis 
