no. 2086. SOME MAMMALS OF THE PLEISTOCENE— HAY. 



543 



What appears to be the third cervical is represented by the hinder 

 part. Its length can not be determined. The width across the 

 hinder articular processes was very close to 64 mm. In the Arabian 

 horse it is TO mm. The width of the hinder articular cup is 34 

 mm.; iri the Arabian, 45 mm. At about the middle of the length 

 the spinal canal had a height of 22 mm. and a width of 24 mm. 



The first dorsal is in part present. The anterior end and most 

 of the spinous process are missing. The distance from the outer 

 border of the articular cup for the head of the rib to the corre- 

 sponding point on the opposite side is 51 mm. 



The second dorsal is represented by the greater part of the body 

 and the base of the spinous process. 



Measurements of the second dorsal vertebra in millimeters. 



Arabian. 



Length, of the centrum 



Vertical diameter of anterior articular head 



Lateral diameter of anterior articular head 



Width from outside to outside of hinder cavities for head of ribs 



E.J ran- 



E. hemi- 



CISCl. 



onus. 



38 



38 



27 



29 



28 



27 



50 



56 



45 

 36 

 33 

 60 



What appear to be the sixth, seventh, and eighth dorsals are 

 articulated together and still partly enclosed in the matrix. The 

 spinous processes are missing. The length of the three centra taken 

 together is 96 mm. In the Arabian horse the corresponding measure- 

 ment is 110 mm. On the left side of the three vertebrae are the cavi- 

 ties for the heads of three ribs, while on the right side there are 

 the bases of three ribs. Three other dorsals, much damaged, 

 form a mass and bear with them the bases of two ribs. 



The lumbar vertebrae are represented by the first, second, third, 

 and the hindermost. The spinous processes are missing from all 

 and the lateral processes from all except the hindermost. A part 

 of the articular head of the first is gone. The length of the three 

 centra, taken together, was very close to 122 mm. The dimensions of 

 the third lumbar are as follows: 



Measurements of the third lumbar vertebra in millimeters. 



Length of centrum 



Height of anterior articular surface 



Width of anterior articular surface 



Height of posterior articular surface 



Width of posterior articular surface 



Distance across anterior articular processes 



E. 



E. 



francisci. 



hemionus. 



39 



41 



27 



26 



30 



35 



23 



22.5 



37± 



43 



34 



40 



Arabian. 



42± 



32 



48 



51 

 45 



The hindermost, fifth or sixth, lumbar of the specimen is attached 

 to the first sacral. The spine is gone and the outer ends of the trans- 



