404 



Annals of the South African Museum. 



AETONYX PALUSTRIS Broom. 

 Text fig. 30. 



1911. Broom. Ann. S. Afrie. Mus. VII, 4. ]. 30 i. Pis. XV and XVII. 



The type consists of "a tew imperfect dorsal vertebrae, a good 

 scapula and coracoid. a good humerus, a good radius and imperfect 

 ulna, the greater part of each maims, the upper end of one tibia, 

 and the almost complete right pes". 



A little extra description can be added to that given by Broom. 

 There are portions of three cervical vertebrae attached to one another, 

 of which the middle one is almost complete. The centrum has a 

 length of 70 mm. and a height at the articular surface of about 



Fig. 30. Aclonyx palustris, Br. 

 Right Metatarsal. I. (Durban Mus.X 

 Distal end, front view. 



35 mm. The maximum height of the bone is 08 mm. As in Mas- 

 sospondylus the centrum is elongate and compressed with a concave 

 ventral surface; but the median ventral keel is not nearly so prominent 

 as in the larger form. The neural spine is slightly higher than in 

 M. carinat'its, but is of the same type. The zygapophyses, as far as 

 they can be seen, agree with those of Massospondi/lits. The transverse 

 processes are small. 



Several vertebrae from the posterior part of the tail are preserved, 

 seven of them in association, and others now isolated but forming, 

 according to Mr. Walker's field numbers, a series of 8. The former 

 are more complete than the latter. 



The length of the centrum in the first series diminishes from '25 mm. 

 to 23 mm. with the last having a length of '20 mm. The maximum 

 height of the largest bone is '2'2 mm., and of the centrum 11 mm. 



