374 Annals of the Sonth African Museum. 



THECODONTOSAURUS MINOR Htn. 



Text fig. 21. 

 1918. Haughton. Ann. Mag. Nat. Hist, IX, II, p. 468. 



"The specimens forming the type of this new form were presented 

 to the South African Museum by the late Dr. M. Ricono. They 

 consist of a left tibia, a cervical vertebra, and a portion of the 

 left ilium. 



Left tibia. The tibia is 109 mm. long. The proximal articular 

 surface is 31 mm. long, and 18 mm. broad. This surface for the 

 most part slopes obliquely backwards and laterally, the inner border 

 being convex from front to back and higher in front than behind. 

 The tuberositas tibiae is almost the highest point of the bone; it is 

 prolonged anteriorly and turned slightly outwards. The lateral con- 

 dyle is strongly developed. Below the head the shaft thins rapidly 

 until at its middle it has an anteroposterior thickness of 12 mm., 

 and a width of 10 mm. Thence it thickens towards the distal end. 

 The anterior face is Hat with a prominent edge on the lateral side 

 and a rounded edge medially. The outer sharp edge is continued 

 down to the anterior distal process. The posterior border of the 

 shaft is rounded. 



The distal surface is trapezoidal in form. The inner anterior 

 border is 20.5 mm. long, the posterior outer border 16 mm. long, 

 while the posterior inner border is 12 mm. long. The anterior 

 process lies 7 mm. above the posterior process. Between the two 

 on the outer surface of the bone is a shallow groove. 



Cervical vertebra. The length of the body is 31 mm. The anterior 

 articular surface is slightly larger than the posterior. Both are con- 

 siderably higher than broad. The body is pronouncedly amphicoelous. 

 There is a prominent median ventral keel, sharper in its anterior half. 

 The whole body is strongly compressed laterally, having a width at 

 the middle of 5 mm., and the anterior end of 8 mm. The canal 

 has a height and breadth anteriorly each of 5 mm. The ends of 

 the zygapophyses are missing. The dorsal spine was low and fairly 

 long with a somewhat convex upper border. 



Ischium. A portion of what is probably the left ischium is pres- 

 erved, including the proximal articular surface. The bone is bent 

 strongly backwards, more so than in Thecodontosaurus anriquus as 

 ligured by von Huene, so that the ischium must have been directed 

 very strongly backwards. At the broken distal end the bone is 

 12 mm. thick, and 6'5 mm. broad. The inner border of the proxi- 

 mal surface is straight, the lateral border has a prominent outward 



