354 ON A SPINAL COLUMN OF LOXOMMA ALLMANNI. 



for the intervertebral disk and adjoining vertebral bodies ; the 

 inner-lying one for a transverse process, or it may be representa- 

 tive of the rib tubercle, which may have supplied the place of a 

 transverse process. 



The first of the series differs from those that follow it ; but 

 this may be apparent only, owing to its two parts being folded 

 one over the other. 



The second and third resemble each other. Their upper parts 

 are perfect. Their connecting plate continues downward for 

 one inch and a half, and ends in a curved, concave border. The 

 lateral parts, in form of ribs, go on separately beyond, that lying 

 next the column being very much shorter than the other. 



The fourth, which is somewhat similar, is only one inch and a 

 quarter long in the plate, and the short limb or rib is shorter 

 than that of the third. 



The fifth is fragmentary, about two inches long altogether, 

 and its head lies in its proper relation to the vertebral column. 



The sixth and seventh are smaller fragments still, and the 

 eighth is insignificant. These are portions of rib heads, and lie 

 on their proper intervertebral disks. 



Prom 'No. 30 to the end of the long part of the specimen are 

 two more vertebrae, about the same size as those last noticed. 

 They are tolerably perfect, showing neural spines nearly entire, 

 broad, and smooth, except for a ridge running down their middle, 

 and curving backwards and downwards to the posterior zygapo- 

 physis. This ridge implies an increased muscular development 

 at this part of the spine of the animal. The zygapophyses here 

 all lie in their normal positions. Beyond these vertebrae there 

 is in the matrix a small detached portion of another zygapo- 

 physis, which belonged to a 33rd vertebra. 



Nos. 25, 26, 27, 28, 29, 30, 31, and 32 form that part of the 

 specimen which has been figured in the accompanying Plate YI., 

 fig. 1, at one-half the natural size. 



The short portion of the specimen lying posterior to and apart 

 from that just described consists of four vertebral bodies and 

 intervertebral disks, broken off somewhat on the upper surface. 

 On each is a more or less distinct articular facet, perhaps for 



