Case.] Turtles. 377 



sharp, and elevated above the rest af the bone. At about its 

 upper third, the bone turns sharply backwards, and is rough- 

 ened. Plate lxxxi, figure 8. 



The pubis of this form could not have been very different 

 from the same bone of Chelonia, broad and flat anteriorly and 

 contracted behind. 



The ischium is broad and flat, constricted in the middle, 

 the anterior border being strongly concave, as is the poste- 

 rior border above and below the ischial spine. On the upper 

 part of the iliac end are the two facets for the ilium and 

 pubis, which meet about in the middle. Both facets are elon- 

 gate oval, slightly concave. The ischial portion of the ace- 

 tabulum is narrow. The symphysial facet is long, slender, and 

 crescent-shaped. The iliac spine extends backward nearly at 

 right angles to the axis of the bone, immediately below its 

 middle. It is rather large ; its end is broken away in the 

 single specimen examined. The upper surface of the ischium, 

 near its edge, from the ischial spine to the central symphysis, 

 is distinctly rugose ; along the symphysis the rugosity is less 

 pronounced. Plate lxxxii, figure 6. 



The femur is rather long and slender, weaker than the hu- 

 merus, and evidently supported a much less powerful limb. 

 The proximal end shows a well-developed head, oval in outline 

 and supported on a distinct neck. On either side of the head 

 are two tuberosities ; the larger and internal one is separated 

 from the head by a distinct notch and stands well out from the 

 body of the bone. It is rugose, for muscular attachments. 

 The anterior tuberosity is smaller, and seems to be only a small 

 expansion of the external part of the head. These tuberosities 

 give to the proximal end of the bone a tripartite appearance, of 

 which the head is the middle, and is situated almost entirely in 

 the internal side of the bone. Behind the head, on the external 

 side, there is a deep concavity, which is in part due to crushing 

 in the described specimen. The middle portion of the bone is 

 contracted into a slender, regular shaft in the middle third. 

 The bone expands into a broad, spatulate distal end, which 

 shows no distinct division into facets for the tibia and fibula. 



