378 



and those of the last four pairs of ribs appear to have terminated freely. The clavicles are 

 retained in connection with the cartilaginous anterior extremity of the sternum. 



2082. The four lumbar vertebrae. 



They show the adaptation of the anapophyses to strengthen the joints of the articular 

 processes. 



2083. The sacrum and ossa innominata. 



2084. The twelve caudal vertebrae. 



Haemal arches are articulated below to the eight anterior interspaces. The spinous pro- 

 cesses of the five anterior vertebrae have expanded extremities flattened above, to aid in sup- 

 porting and moving the caudal fasciculus of quills. 



2085. The bones of the right anterior extremity, naturally articulated. 



A greater proportion of the scapula is included between the parallel borders of the upper 

 and lower costa and the concave border between the anterior end of the straight part of the 

 upper costa, and the coracoid is shorter and deeper, than in the skeleton, No. 2075. The 

 acromion is shorter and more expanded, especially at its extremity, which is bifurcate, the 

 upper division being most produced. There is no perforation between the condyles of the 

 humerus. 



2086. The bones of the right hinder extremity, naturally articulated. 



The perforation of the medullary artery of the femur is just below the small trochanter. 

 There is a fabella behind the inner condyle, but none behind the outer one. The patella is 

 large and long, ossification extending below the articular surface. The proximal end of the 

 tibia is compressed, broad, with a slight projection from its front and back margin. 



2087. The cranium of a Porcupine (Hystrix cristatd), vertically and longitudinally 

 bisected, with the teeth removed from the right side, and separately displayed ; 

 the three true molar teeth and the long incisor from the same side of the 

 lower jaw being displayed on the same tablet. 



This cranium agrees with that of the preceding disarticulated skeleton in general size, in 

 the sharp sagittal ridge formed by the meeting of the temporal crests, which extend from the 

 coronal suture, in the comparative shortness of the frontal bones, whereby the frontal suture 

 does not exceed in length the sagittal one, in the smaller proportional extent of the facial 

 part of the lacrymal, in the greater proportional length of the nasals as compared with the 



