88 NEW PALEOZOIC VERTEBRATA. [Feb. 5, 



Measu7'einc7its. MM. 



Length of ulna 1 1 



'' *^ first finger, total 15.5 



" '' *' metacarpal 6.5 



** " '' phalange i 5 



" " '' claw 4 



The inequality of the lengths of the teeth with long ones anteri- 

 orly and medially, is what is seen in the type of Colosteus, C. scutel- 

 latiis Newb., and in Anisodexis Cope. The lower jaw of the spe- 

 cies from Linton which I called A. efichodus is not longer than that 

 of the present species, if as long; but it is much more robust, and 

 the elongate teeth are much longer, relatively and absolutely. It 

 may belong to the same genus. As compared with the Sauropleura 

 (^Colosteus) scutellata, this species differs in having a median 

 V-shaped series of abdominal scales, and in the more slender digits. 

 From the two other species referred to Colosteus, on the strength 

 of thoracic scuta, this species differs, in the rounded posterior out- 

 line. In those species {C. foveatus and C. pauciradiahis) the pos- 

 terior borders are sharply convergent to an obtuse angle. As 

 compared with Sauropleura digiiata Cope, this species has relatively 

 a much shorter forearm. In that species the ulna is five-sixths the 

 length of the humerus, and the digits are less slender than in the 

 S. latithorax. 



From the collection of Mr. R. D. Lacoe, to whom I owe the 

 opportunity of studying the unique specimen. 



REPTILIA. 



IsODECTES PUNCTULATUS Copc, American Naturalist, 1896, p. 303 > 

 Tuditanus punctulatus , Trans. Amer. F kilos. Soc, 1874; Geo I. 

 Survey of Ohio, ii, 1874, p. 392, PI. xxxiv. Fig. r {Tuditanus 

 longipes in explanation, by error). 



PL III, Fig. 3. 



A collection from Linton, Jefferson county, Ohio, obtained from. 

 Mr. Samuel Houston, contains the greater part of the skeleton of 

 what I suppose is this species. The head, scapular arch and one 

 fore limb are lost. The remainder agrees very well with the typical 

 specimen which was obtained by Dr. Newberry from the same 

 locality and horizon. 



