172 



THE PERMO-CARBONIFEROUS RED BEDS OP 



Pubis.— The pubis No. 3245 (fig. 45, d and e), considered as reptilian, 

 resembles very closely that of Varanosaurus, having the same peculiar bend- 

 ing of the plate-like anterior portion, giving the floor of the opening a convex 

 surface, upward, both fore and aft, and from side to side. It differs from the 

 same bone in Varanosaurus in the position of the foramen, which is well within 

 the bone instead of being so near the posterior end that its posterior border 

 is incomplete and is closed by the adjacent portion of the ischiiom. This 

 pubis probably belongs to Clepsydrops or Poliosaurus. 



LOWER LIMB BONES. 



There are certain bones of the lower limbs which are so heavy and short 

 that they can not be associated with any of the bones described above. It 

 is possible that they may belong with some of the amphibians or may 

 even be bones of immature individuals of Eryops, but they differ so widely 

 from the mature bones of the last genus that it seems more probable that 

 they belong to some form of diadectid reptile otherwise unindicated. 



Fig. 46. — Unnamed reptile. X %. 

 (a) (6) (c) (d) four views of tibia, No. 3355; (e) tibia, No. 3433; (/) ulna. No. 3434. 



Two tibiae, No. 3355 (fig. 46, a, b, c, d), are rather short and heavy, with 

 a poorly developed groove on the anterior face of the upper end. The proxi- 

 mal articular face is semicircular, with its long axis nearly at a right angle to 

 the long axis of the distal face. The shaft is angular, due to the development 

 of ridges, one extending from the inner edge of the proximal end to the corre- 

 sponding point on the distal end, another from the outer part of the anterior 

 edge of the proximal end to the outer part of the posterior edge of the distal 

 end. Length, 48 mm. 



Three tibiae. No. 3433 (fig. 46, e), similar to the preceding but lacking 

 the strong twisting of the shaft which brings the two faces into such strong 

 angtilation, also lacking the prominent ridges. 



Two ulnae. No. 3434 (fig. 46, /) , which may belong to an immature Eryops. 

 These, of all the fore-limb bones, approach nearest to the amphibian type, but 

 can scarcely be assigned to the genus Eryops with certainty. The proximal 

 face is nearly circular and quite flat, but is strongly inclined forward. The 

 shaft narrows rapidly below the head and then expands slowly to the distal 

 end. The distal articular face is a narrow oval with a slight undulation of the 

 inner edge. Length, 61.5 mm. 



