384 



PALEONTOLOGY OF OHIO. 



of the preceding abdominal region, with pelvis, etc. The determinable 

 portions of the last consist of a narrow bone, which is directed back- 

 wards and somewhat inwards on each side of the vertebral column. Its 

 form resembles that of the ilium of Protonopsis, and is, like it, slightly 

 expanded at the anterior end. It also resembles the corresponding ele- 

 ment in Sauropleura longipes, and in neither this species nor that can I 

 find the segment or modified rib which connects it with the sacral verte- 

 bra in the existing genera of Salamanders. Towards the head of the 

 femur it turns rather abruptly inwards, and it is possible that the latter 

 portion represents the true ilium. In S. longipes the bone is straight, 

 and on both sides extends to the head of the femur. The femur is rather 

 short, nearly straight, contracted medially and expanded distally ; the 

 tibia is shorter and subcylindric. Beneath the ilium the last chevron of 

 the abdominal rods appears, the outer extremities rising on the base of 

 the tail. The caudal vertebrae are similar to those described below. The 

 fans are elongate, truncate, and delicately lined. 



Length of four proximal caudal vertebrae, 0.0175 m. ; expanse of fans 

 second do., .0185; length ilium (end broken), .0115; distal diameter do., 

 .0030; length femur (both), .0115; distal diameter do., .0040 length 

 tibia (both preserved), .0070. 



Another specimen exhibits a length of 0.170 m., without indication of 

 extremities or head. 



Fig. 3. 



CAUDAL VERTEBR.*;, NATURAL SIZE. 



Besides one complete series, the caudal region is represented by a por- 

 tion of the vertebral column three inches in length. In this space may 

 be counted twenty-four vertebrae. Such of the latter whose outlines are 



