I poo.] Gidley, A New Species of Pleistocene Horse. 1 13 



the Museum we observe some striking differences. While the 

 skulls are about equal in length and the series of dorso-lumbar 

 vertebrse is only about i inch longer in the recent horse, the cer- 

 vical series of E. scotti is about 4 inches shorter and the fore 

 limb, in the standing position, is about 6 inches less in length. 



Thus, this skeleton represents an animal with a head about the 

 size of that of a large draught horse, but with the height of body 

 and length of limbs of an ordinary western pony, and with a 

 length of body very similar to that of the Zebra or Quagga. 



A comparison of the separate bones of the skeleton reveals 

 very few and unimportant differences, hence it is to the skull and 

 teeth that we have to look for specific differences. 



Dentition, 



Unfortunately all the bones of these skeletons, while adult, 

 are of young horses, none of them having shed their last milk 

 molars or external milk incisors. As 

 far as can be made out the teeth differ 

 from those of E. caballus only in their 

 much larger size. M' of the type skull 

 (Fig. 2), indicates perhaps a little 

 greater degree of complexity of the 

 enamel folding on the triturating sur- 

 face than is usual in E. caballus, but it 

 should be taken into account that this 

 is only a slightly worn tooth and shows ^'S' '• ^^ ^^ e. scotti. 



a greater degree of complexity than it would at a more advanced 

 stage of wear. 



The measurements of the teeth that are enough worn to give 

 their true diameters are as follows : 



T-,- . r r ? i antero-posterior 33 mm. 



Diameters of crown of p'' -^ .^ ^ -'-' 



^ / transverse 31 mm. 



■n- I / f 1 i antero-posterior 32 mm. 



Diameters of crown of m' i ^ ^ ^ 



( transverse 30 mm. 



Long diameter of i ' 23 mm. 



Total length of molar-premolar series 190 mm. 



Diameters of the corresponding teeth of the large draught 

 horse (No. 528): 



r>;„..,„.« t c i \ antero-posterior 2q mm. 



Diameters of crown of p'* ■< ^ ^ ^ 



^ I transverse 27 mm. 



.August, /goo.^ s 



