290 



THOMAS DWIGHT ON 



267. 



inclined, especially in the latter case, to classify them 

 as wanting a cervical vertebra, but the cervical rib in 

 both cases is imperfect on the other side. It is held 

 therefore that a thoracic vertebra is wantiny. 



267. Cat. 9379-30.1 



Male, white, aet. 20. Height 170.5 cm. C. 7, T. 

 11, L. 5, S. 5, C. 4. 



This spine has an absolutely unique malformation 

 of the atlas that shall be described after the other 

 peculiarities. 



The 6th cervical vertebra has a long spinous 

 process like that of the normal 7th. The anterior 

 transverse tubercle is large on the left (on which side 

 the cervical rib is less developed), and small on the 

 right. The body of the 7th cervical is deeper verti- 

 cally than that of the average 1st thoracic. It has a 

 facet for the head of each cer^dcal rib near the top of 

 the body, and a slight upward deflection of the lower 

 border above the socket for the head oi the 1st tho- 

 racic rib. The spinous process is a repetition of the 

 preceding. Seen from behind, the transverse proc- 

 esses rise towards their ends like those of a 1st 

 thoracic, which on the whole the vertebra resembles 

 very closely. 



The 8th vertebra has nearly a whole costal facet 

 above, and a very small part of one below. The upper 

 surface is plane, instead of being concave transversely, 

 as a first thoracic should be. The spinous process also 

 is more compressed towards the end than that of a 1st. 

 The 16th (9tli thoracic) is like a 10th in having no 

 facet on its lower Ijorder. The 17th bears on the right 



iThis spine was described (I)wiglit, '87) t.ogetlier witli .spine 300. 

 By an uniorLunate mistake, for wliioli I am not responsible, tlie atlas of 

 this spine was marked " case 1," the rest of this .spine "case 2," and the 

 other spine "case .S." 



