202 Transactions of the South African Philosophical Society. 



degree of lateral movement. The more distal phalanges have saddle 

 articulations. 



The following are some of the principal measurements : — 



Length of tibia 199 mm. 



Antero-posterior measurement of proximal end 



of tibia 56 



Width of distal end of tibia 39 



Length of 3rd metatarsal 100 



4th „ 87 



1st phalanx of 4th toe 28 



2nd „ „ 22 



3rd „ „ 18 



„ 5th metatarsal 42 



There has recently been presented to the South African Museum, 

 Capetown, by Mr. Alex. Moir, a block of sandstone from Ladybrand, 

 O.E.C., containing the remains of a considerable part of the skeleton 

 of an immature Hortalotarsus. The bones to a large extent have 

 been dissolved out leaving casts, or where preserved they are in 

 most cases too friable to be satisfactorily developed. The bones are 

 at the ends imperfectly ossified, the animal being evidently not quite 

 mature. When allowance is made for this, however, the agreement 

 of the bones with those of Hortalotarsus skirtopodus is so close as to 

 leave no doubt that this specimen belongs to the same genus, and 

 very little doubt that it is the same species. The following parts of 

 the skeleton have been displayed : Eleven dorsal and six caudal 

 vertebrae, a few ribs and some abdominal ribs, part of the right 

 scapula, both ilia, the right being fairly well preserved, the right 

 pubis and ischium, the right femur and fibula, the tarsus, and the 

 perfect right pes. 



The dorsal vertebras are only represented by imperfect casts, and 

 those preserved are fairly similar. The best preserved is the 4th 

 last. It is a little longer than high. The centrum is 33*5 mm. in 

 length, and considerably broader than high. When viewed from the 

 side the lower border is seen to be moderately concave. The arch 

 is not yet quite anchylosed to the body. The spine is comparatively 

 low and rather long antero-posteriorly. The zygapophyses are long, 

 and appear to have been largely articulated with one another. From 

 the anterior to the posterior zygapophysis the vertebra measures 

 48 mm. There are indications of a transverse process in the position 

 shown in the Fig. 



The caudal vertebrae are much shorter and a little higher than the 

 dorsals. Well-developed chevrons are found attached, 



i & j 



