OF THE NEW RED SANDSTONE FORMATION OF PENNSYLVANIA. 201 



Bones of the Limbs. Plate 18, fig-. 1. 



There are several fragments in the collection, but they are so imperfect as to 

 render it very difficult to designate as to what particular bones they belong. There 

 is an impression in the rock, of what appears to be the cast of a portion of a femur or 

 humerus, too imperfect to be represented ; the diameter is about two inches. Fig. 1 

 represents a bone, which may be one of the fore arm or the leg. It is curved, 

 flattened on one side and slightly impressed on the other. The head is broken off, 

 and the fractured portion presents a subtri angular outline. The length of this piece 

 is 3.8 inches ; the width .9, and thickness 18 twentieths of an inch in the middle. 

 At the superior fractured portion it is 1.3 inches. 



The Teeth. PI. 19, fig. 3, 3 a, 3 b, 3 c, 3 d. 



There was neither a whole tooth nor any portion of the jaw found with the bones 

 of this animal. Three fractured portions of a tooth, and some still smaller pieces 

 only were obtained. I have, at fig. 3 b, endeavored to reconstruct it with these. In 

 length it must have been about 1.8 inches long, its widest part, near the base, beino- 

 nine-twentieths, and transversely seven-twentieths of an inch. It is here flattened on 

 one side, and gibbous on the other. The posterior portion is compressed into an 

 accute angle, the edge being armed with very minute closely approximate serratures. 

 There are four-tenths of an inch of this cutting edge unbroken, (fig. 3,) on which 

 there are forty-two serratures=105 to an inch. At 3 d, these serratures are repre- 

 sented, enlarged. The anterior portion near the base is flattened, so that the 

 transverse section presents a very irregular figure. This form is gradually changed, 

 through the upper portions to an elliptical and circular form. Five ofthe.se sections are 

 represented at fig. 3 c. The body of the tooth is smooth, but towards the apex it is 

 slightly striate. The upper fragment (fig. 3 a) only shows the striae. In comparing 

 this tooth with those nearest allied to the Clepsijsaurus, it seems to me that the most 

 approximate is that of the Cladeiodon, Owen, Odontography page 268, pi. 62 A, fig. 

 4, from the "New Red Sandstone (Keuper?) of Warrick and Leamington," which 

 are found in the same quarries as those containing the remains of the Labj/rinthodon. 

 He says the teeth are intermediate between the Thecodontosaurus and the 

 Palceosaurus. None of the bones had been found. The figure of Professor Owen 

 represents a much shorter tooth than ours, and the transverse diameters differ very 

 much. The serratures in his figure extend nearly the whole length of the tooth 

 while in the Clepsysaurus they do not seem, from the fractured portions we have 

 seen, to extend more than half the length. 



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