REPTILIA: LIMNOSCELIS 



43 



concave in outline, the inner less so. The lower extremity is much 

 thickened. The fibula is a more slender bone than the tibia, and 

 is longer. Its proximal end is thickened and subquadrate in shape; 

 the lower end is thin and con- 

 siderably expanded. 



Hind foot. — ^As already 

 stated, the foot bones of speci- 

 men No. 8ii were more or less 

 weathered. From the wash 

 numerous toe bones and the 

 ends of the epipodials with 

 attached car pals had been 

 gathered up by Mr. Baldwin, 

 and some of them still retain 

 enough of their original ma- 

 trix to show their relation- 

 ships, but how many of them 

 are irretrievably lost cannot 

 be determined at present. 

 Fortunately, however, in 

 specimen No. 809 the tibia 

 and fibula of both sides were 

 pieserved in position with the 

 tarsal bones attached; fortu- 

 nately, since one would 

 hardly have identified the 

 tarsal bones correctly had 

 they been found isolated, so 

 very different are they from 

 the corresponding bones of the 

 Pariotichidae or Pelycosauria. 

 The tibiale is nearly cuboidal 

 in shape, with a slight notch 

 only between the articular 

 facets for the tibia and fibula. F'^^- i6.—Limnoscelis pabdis. Right 



Tt<5 outer facet is thickened for ^'""^ '^^' ^°''^^ '''^^' 'P^"""^" ^°- ^' '^°- 

 its outer lacet is tmcjcenea lor gj^j^^ ^^^^^^^j ^j^^ ^_^.^ ^^^^ intermedium 



imion with the fibulare, but I and tibiale. 



