TRANSACTIONS OF WAGNER 



PROCAMELUS 



The measurements of the specimens are as follows : 



Fore and aft diameter of last molar 

 Transverse diameter of last molar 

 Fore and aft diameter of first molar . 

 Transverse diameter of first molar 

 Fore and aft diameter of last premolar 



46 mm. 

 37 " 

 33 " 

 33 " 



An isolated last upper molar, little worn and well preserved, plate xvii. 

 fig. 17, submitted to my examination by Dr. J. C. Neal, previously to find- 

 ing the former specimens, is smaller than either of the above corresponding 

 teeth and probably represents the second-sized species, A. viedms, indicated 

 by the bones. Its fore and aft diameter is 36 mm., its transverse diameter 

 27 mm. 



Some additional specimens, a last upper molar, a last premolar, plate xvii. 

 fig. 12, and fragments of several other upper molars, accord in proportions 

 with the first described lot of teeth. 



The fossil molar teeth while resembling those of the Camel in construc- 

 tion seem to have the crowns proportionately somewhat less long, of rather 

 greater breadth transversely, with the inner sides of the upper teeth and the 

 outer sides of the lower ones less vertical or more sloping, and the opposite 

 sides of the same teeth rather more prominently folded. 



The upper penultimate premolar, or the first tooth of the continuous 

 molar series, has a better developed crown than in that of the Camel, and it is 

 inserted like the succeeding premolar by three well-produced fangs. The 

 crown is wider fore and aft than in the Camel and shows a greater disposition 

 to form an inner lobe, which in the fossil tooth appears as a thick, crescentic 

 fold deeply notched at the middle. 



The corresponding lower premolar is a reduced form of that behind it, 

 and is inserted by a pair of well-produced fangs in closer apposition. The 

 fore part of the crown is not reflected inward as in the last premolar, but is 

 directed forward and presents an acute border in the same position. The 

 worn triturating surface of the last lower premolar exhibits an elliptical 

 enamel-pit, which is absent in the preceding tooth from the corresponding 

 inner fold not having penetrated the crown so deeply. 



Scapula. — Of five specimens of the glenoid extremity of the scapula in 

 the collection, two pertain to^. major and three to A. ininittms. They accord 

 with the corresponding portion of the same bone in the Llama. 



