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90 NEW PALEOZOIC VERTEBRATA. [Feb. 5, 



fifth digits are the only ones with all the phalanges preserved. 

 These number two and four respectively, with a possible doubt as 

 to the first digit. The other toes are represented by the following 

 numbers of phalanges : second, 3; third, 3; fourth, 5. Enough 

 remains of the manus to show that there were at least four digits, 

 composed of segments rather shorter than those of the pes. Three 

 carpals remain, perhaps centrale, and c. i and ii ; c. i is proximad 

 to c. ii, and on the inner side of the centrale. 



As a result it appears that the tarsus is very different from that of 

 the Pelycosauria. How nearly it approximates the other Cotylo- 

 sauria it will be my object to show shortly. It is primitive and 

 only lacks identity with the batrachian tarsus in the absence or 

 fusion of the tibiale. 



Measurements. mm. 



Length of specimen 128 



Expanse of ribs 18 



Length of rib, on curve 14 



*' *' centrum of fifth vertebra anterior to sacrum 4 



Depth " do, with arch 4 



Length *^ femur 15 



Distal width of do 4 



Length of tibia 7 



Width "■ head of do 3 



*' " distal end of fibula 3.5 



'* " tarsus 6 



Length " metatarsal iv 4.5 



'' *' phalange i of digit iv 4 



II II (( ii " *^ . -21; 



(( (( {( jjj (C i( ^ - 



** *' digit V, with metatarsal 16 



" " median caudal vertebra ... 3 



This specimen is of importance as pertaining to the oldest known 

 reptile, and the only one which has been thus far positively identi- 

 fied from the Coal Measures. I announced this identification in 

 the American Naturalist, 1896, p. 303. 



