1852.] MANTELL ON DEVONIAN REPTILE. 103 



the skeleton is indicated by a slight convexity, with an obscure me- 

 dian ridge ; apparently produced by coalesced sacral vertebrae : on 

 the stone, PL IV. 8, the corresponding impression is better defined, 

 but there are no manifest outlines of the bones composing the pelvic 

 arch. The subquadrangular depression in PI. IV. 8 closely resem- 

 bles that which would be left by the dorsal surface of the pelvis of 

 the Salamanders ; and under some points of view I thought there 

 were perceptible traces of ilia and ischia resembling those of that 

 family ; but no reliance can be placed on this supposition. I have 

 sought in vain for such impressions as the iliac bones of Iguanas or of 

 other Lacertians or Saurians would produce ; and I am not aware of 

 any reptilian pelvis, except that of Batrachians, that could give rise 

 to such an outline as is seen in PL IV. 5, 8, 9. 



It may be proper to remark, that the pelvis is placed after the twenty- 

 fourth vertebra as in the Iguana ; in Batrachians the pelvic arch is 

 usually attached from near the fifteenth to the eighteenth vertebra ; 

 but in the fossil Salamander of (Eningen, it is situated near the twenty- 

 first or twenty-second. 



Pectoral arch. — Of this important element of the skeleton there 

 are no vestiges exposed. 



Anterior extremities. — Impressions of the distal half of the left 

 humerus, and of the corresponding proximal portions of the ulna and 

 radius (PL IV. 9) are the only indications of the anterior limbs, and 

 these present no distinctive characters. 



Hinder extremities. Femora. — Both femora (PL IV. 8, 9) have 

 left distinct imprints, so that the form of the original can be made 

 out. A restored outline is given in PL IV. 5. The femur has an 

 oval head, a sharp process or trochanter on the inner side of the 

 neck, and a subcylindrical shaft, the distal end of which is slightly 

 expanded, and compressed in its antero-posterior diameter : the popli- 

 teal space and the two small condyles are seen in PL IV. 5. 



Tibice and Fihulce. — The forms of these bones are not perfectly 

 defined by the imprints on the stone. The tibia has the shaft 

 gently bowed, and expanded at each extremity ; the corresponding 

 fibula is a more slender bone : its entire shape is not seen. 



Feet. — Unfortunately there are not the slightest traces of the bones 

 of the feet. 



The following measurements are added to give more precision to 

 the above description : — 



Cranium, length 8 lines. 



Vertebral column, from the occiput to the pelvis, 2*4 inches. 



Ribs, the longest 6 lines ; equal to about the length of five dorsal 

 vertebrae. 



Femur, length 5|- lines. Tibia, length 4 lines. 



Pelvis, transverse diameter 4 lines. 



, antero-posterior diameter 3 lines. 



As the drawings are of the size of the original, further particulars 

 are unnecessary. 



The above statement comprises every osteological character of this 



