On the South African Dinosaur (Hortalotarsus). 203 



Only a few portions of true ribs are seen, but there are a number 

 of fairly well-preserved abdominal ribs. It seems probable that the 

 plastron has consisted of a median series with an outer series on 

 either side. 



The right ilium is perfect except a portion of the crest. In 

 contour it agrees pretty closely with the ilium of Palceosaurus. 

 There are well-developed pubic and ischiac processes,, but they have 

 not been fully displayed owing to the nature of the specimen. The 

 crest as preserved measures 130 mm. This, however, is probably 

 the full length. The anterior border of the ilium is more open than 

 in Anchisaurus. The contour of the posterior border also differs a 

 little from that of Anchisaurus. 



The pubis and ischium of the right side are fairly well preserved, 

 but considerably crushed and somewhat displaced. They are 

 figured in their relative positions to each other as found, but not 

 exactly in their relative positions to the ilium. 



The pubis approaches rather more nearly the Zanclodont type 

 than the type of Anchisaurus. The distal extremity is moderately 

 thick but evidently flattened. The proximal end has an inferior 

 notch as in Zancloclon and Massospondylus , but the bone is .less 

 expanded below the notch than in these genera. 



The ischium is a moderately stout bone, probably not unlike that 

 of Massospondylus, but it is too much crushed to enable one to make 

 a careful comparison. 



The femur is fairly well preserved and its anterior surface has 

 been displayed. The upper and lower ends are imperfectly ossified, 

 but the bone seems to have resembled fairly closely the femur of 

 Anchisaurus. The lateral trochanter is situated above the point 

 of union of the upper and middle thirds of the bone ; in this 

 resembling Anchisaurus but differing from Massospondylus or 

 Zanclodon. The proximal trochanter is very slightly developed. 



The fibula is comparatively slender, but stouter proximally than 

 distally. 



The tibia has not been displayed as the foot is folded on it. 



The foot is strikingly like that of Anchisaurus. The bones are 

 very badly preserved, but the casts show pretty satisfactorily most 

 of the details. 



The tarsus consists of two proximal elements — the tibiale and 

 fibulare. The intermedium was probably not fully ossified in this 

 immature specimen. The distal row of the tarsus is represented by 

 two bones, apparently tarsalia 3 and 4. 



The metatarsals, though rather more slender, are essentially 

 similar to those of Anchisaurus. Proximally they overlap in like 



