BIG BADLANDS OF SOUTFI DAKOTA. 71 



individual, with the upper part of the whole length broken away," 

 which " contains all the molars nearly perfect," with " the crowns 

 worn nearly to the edge of the alveoli," and " also in the same collec- 

 tion a face very much mutilated, except the forehead, of an individual 

 which had just reached adult age " and which " contains all the molars 

 nearly perfect, the last one about two thirds protruded." This sec- 

 ond-mentioned specimen is the so-called " type," beyond the per- 

 adventure of a doubt, for it shows all the features enumerated by 

 Leidy, and has been figured by him, as I have indicated, and as he 

 states himself, in Fig. 13, Plate XIV., "Ancient Fauna."" The 

 very old individual with the top of the head gone is, also according 

 to Leidy's own statement, the original of Plate XV., Figs, i and 2, 

 "Ancient Fauna."" On pages 86 and 87 of this memoir a list of 

 all specimens of Hyracodon known up to the date of acceptance of 

 the memoir (December, 1852) is given. Omitting all the references 

 to fragments which, manifestly, have no connection with our endeavor 

 to identify the type, and passing over the descriptions of the two 

 Owen specimens, which appears in substantially the same words as 

 have been quoted above, we find at the head of the list mention made 

 of "the anterior portion of a skull, accompanied by the lower jaw, of 

 an adult individual. The former has the forehead, orbital entrance, 

 and molar teeth well preserved, but the face is very much broken and 

 its nasal part is displaced. The lower jaw contains all the molars in 

 perfect condition, but it has lost its rami and the symphysis." These 

 parts are figured on Plate XIV., Figs. 1-3, and on Plate XV., Fig. 3, 

 of the " Ancient Fauna " and are said to be from Captain Stewart 

 Van Vliet's collection. Nothing is said about the type in the Smith- 

 sonian Institution which he had previously described in similar phrase, 

 speaking of it as an old individual, which a glance at the plates will 

 show the Van Vliet specimen to be. I do not regard this as an over- 

 sight, but believe that Leidy had in mind one and the same specimen, 

 which might very well have come from Captain Van Vliet's collection 

 and yet belong to the Smithsonian Institution.^- Leidy's figure shows 



1° See " Ancient Fauna," page 86, third line from foot of page. 



'1 See page 87, second line. 



12 Mr. Gidley is unable to supply any information regarding the present 

 location of this specimen. No. 138 of the National Museum collection, ac- 

 cording to Mr. Gidley, is recorded in the old catalogue as having been col- 

 lected by Dr. John Evans. 



