252 THOMAS DWIGIIT OX 



The free portion is 2.3 cm. long on the right, and, 2.2 cm. on tlie left. Their spread 

 is greater than that of the tran.sverse processes of the Ist Inmljar. The pleura lined 

 the right one, but on the left this could not be determined. The change in the 

 articular processes is one place too high : between the 18th and 19th vertebrae. The 

 greatest spread in the lumbar region is at the .3d, Init the 2d almost equals it. The li(ja- 

 menta arcuata externa ended at the tijis of tlif 1 1th libs. Some few facts concerning the 

 nerves could be gained. Apparently the formation of the l)rachial plexus (as far as the 

 entering nerves were concerned) was normal. The only nerves in the lumbar plexus 

 that could be identified with absolute certainty on both sides were the anterior crural and 

 the obturator, which were formed by the 2d and 3d lumbar nerves. The right lumbo- 

 sacral cord seemed to come from the 4th nerve rathci' than from the 5th, w^hich latter 

 joined the 1st sacral. On the left nothing satisfactory could be made out. 



From all this it seems that there was a tendency for the thorax to ascend, and for the 

 lumbar and sacral plexuses to ascend with it. The position of the external arcuate liga- 

 ment implies a similar tendency. In .spite of its lumbar peculiarities the lOtli vertebra 

 has to l)e reckoned as thoracic to maintain tlie proportions as much as may be. 



Total 56.4 57.3 100.0 100.0 



306. Cat. 9379 — 29.' 



Black, male. 



This spine is very like the last one. There is the usual number of vertebrae, the 

 sacrum consistmg of five, and tiie coccyx of four. Both these regions are unusually small. 

 The cervical ribs are nmch smaller than those of the last case. The right one, measured 

 along the concavity, is 3.6 cm. The left is rather .shorter, but an injury prevents accurate 

 measurement. Each ends free; muscular fibres, having the direction of the external 

 intercostal, running from them to the first ribs. The subclavian artery crossed just 

 beyond the cervical rib, resting on tlie front border of the muscle. Pretty nearly the same 

 thing may be said of the botUes of the 7th cervical and of the 1st thoracic vertebra as in 

 the last case; but the first thoracic ribs do not touch the body of the former. The 12th 



' Dwiulii ("87, p. •')4S. wliei'f it is marki-il ■• easL- :! " iiisleail of ■■ case 2''). 



