MORPHOLOGICAL REVISION 129 



for cartilage. The sutures separating the elements are very clearly shown 

 in the present specimen. Those between the ilium and ischium and pubes 

 begin on the margins near the middle of the convexities described and run 

 downward to meet a little below the middle of the acetabulum, that for the 

 ischium being a little longer than the one for the pubis. The puboischiadic 

 suture runs directly inward through the deepest part of the lower margin 

 of the acetabular rim, the length of the ischia below being about a fifth 

 greater than that of the pubes. The depth of the lower pelvic border is due 

 solely to the breadth of the symphysis, the upper surface of the pelvis in 

 the middle showing no corresponding concavity. 



^^^ Femur (plate 22): The femur is remarkable among temnospondyles 

 for its slenderness and the great development of the adductor crest. The 

 proximal articular surface has its transverse diameter but little greater than 

 the anteroposterior one, narrower on the outer side, more convex on the 

 inner, where the articular surface extends more on the ventral side. The 

 digital fossa is small and shallow. The adductor crest arises near the upper 

 part of the bone, is directed outward for a short distance, and then is nearly 

 straight to its distal end near the lower fifth of the bone, and near the middle 

 of the popliteal surface. The shaft of the bone for about the middle two- 

 fifths is very slender, almost cylindrical, save for the crest behind, and is 

 straight. The distal expansion of the bone begins a little above the lower 

 fifth and is a little greater than the proximal one. The lateral linear concavi- 

 ties of the bone on the two sides are nearly symmetrical. The distal articular 

 surface of the bone has sharp borders, indicating a considerable amount of 

 cartilage. The end is much broader transversely than from before back- 

 ward. The transverse tibial surface looks downward and a little backward 

 and inward. The fibular surface is a little longer from side to side and 

 looks markedly outward, backward, and downward. Its width in the inner 

 side is more than one-half of the whole width of the extremity, with narrow 

 extensions both in front and behind. The fibular condylar projection is 

 much thinner and less extensive than the tibial. The extensor groove in 

 front of the distal end is broad and moderately deep, limited on the outer 

 side by a high and rather sharp ridge. On the back side a less prominent, 

 more obtuse ridge opposite the dorsal ridge, and connected with the distal 

 end of the adductor crest, separates a shallow concavity on the inner side 

 from a narrower and deeper one on the outer side. 



"Tibia (plate 23): The tibia is more than three-fourths the length of 

 the femur. Its upper extremity, as usual, is broadly expanded and massive, 

 the lower less expanded and more cylindrical. The upper surface for artic- 

 ulation in the normal position of the bone is broad from side to side and 

 about two-thirds as wide from before back, thicker on the outer than on the 

 inner side, with an emargination on the outer anterior side, the anterior 

 border internally convex, the posterior border nearly straight. The surface 

 is gently convex from side to side, nearly flat anteroposteriorly, and looks 

 on the whole upward and a little backward. The distal articular surface is 

 suboval, its longer diameter running from behind outwardly and anteriorly, 

 with the internal border convex, the outer posterior border more nearly 

 straight or gently convex. The shaft is slender in its middle, broader in 

 section from before backward, and is flattened on the inner side. The inner 

 border of the bone is deeply concave, the outer almost straight, save at the 

 lower end. The posterior surface of the bone is flattened on the upper 



