NUMERICAL VARIATION IN THE HUMAN SPINE. 245 



Class IV. 



Group A. 2(i4. Z. 



" B. 24. 



" C. H-3. 



'- D. 349. 4!t2. 2.57. A-219, A-7. 141. 



Class V. 



Gnuup A. i)-7, iSO. o77. 

 " B. 350, 478. 

 "• C. 267, 202. 



As the above classification necessarily scatters peculiarities (cei'vical ribs for instance) 

 wliich are generally kept together, the folloAving table of the spines and incomplete speci- 

 mens presenting certain peculiarities has been prepared. In some cases of doubtful inter- 

 pretation the same specimen figures in more than one category. This also occurs when 

 one specimen presents more than one of the'se peculiarities. 



Cervical Ribs: 1. A-30. 649, 729, 306. H-3 (?), 349, 492. 267, 202. Incomplete 

 specimens : 725-2, 9379-37. 



Rudimentary First Thorack Rib : (4-22, (not rudimentary but small) A-4, 

 H-3 (?). Incomplete specimens : 140,572. 



Bicipital and Tricipital Ribs : 649, 208. Incomplete specimen : C 1. 



Fusion of Atlas and Occiput: 561. 24. l)-7 (probal)ly pathological). Incomplete 

 specimens: 7737-3, 9638,9639. 8590, 132 (probably pathological). 



Fusion of Atlas and Axis : H-3. 



Fusion of Axis axd Tiiikd Vertebra : 297 (?). 264. Inccmiplete specimens: 4767, 

 1392. 



Suppression of a Cervical \'ertebra; H-3. 202 (?). 



Extra Half Vertebra : 9395-3. 



The following are among the most remarkable spines: 208, 297, two additional prae- 

 sacrals with the last one sacralized on one side ; 264, fusion of axis and 3d ; Z, fusion of 

 and arrested development of several lumbar vertebrae : H-3. fusion of atlas and axis, sup- 

 pression of a cervical vertebra, an additional lumbar, sacralized on one side; 267, unique 

 anomaly of atlas, cervical rib on one side reaching sternuni, suppression of a thoracic 

 vertebra ; 202. cervical rib to uiainibrium on one side, with the next lib ending in place 



