144 Sellards — Chlamytherium septentrionalis. 



Chlamydotherium humboldtii Lund, Cope, U. S. Geol. Survey, 

 Bull. 84, p. 130, 1892. 



Chlamytherium humboldtii Lund, Hay, U. S. Geol. Survey, 

 Bull. 179, p. 581, 1901 (pars.). 



Chlamydotherium humboldtii Lund, Trouessart, Catalog. Mam- 

 malium, p. 812, 1904 (pars.). 



Although presenting the generic characters of Chlamy- 

 therium, the Florida species is apparently distinct from all of 

 the South American species of that genus that have been 

 described. From C. humboldtii, to which species the Florida 

 material has previously been referred, C. septentrionalis differs, 

 if we may rely on Lund's figures, in the form and proportion 

 of the jaw, the relative size and position of the teeth, as well as 

 in the sculpturing of the dermal plates. The inferior margin 

 of the jaw of C. septentrionalis is full and rounded, while in 

 C. humboldtii the margin is noticeably constricted between the 

 angle of the jaw and the symphysis. Moreover, in C. septen- 

 trionalis the symphysis begins opposite the fifth molar, count- 

 ing from the back, while in C. humboldtii the symphysis is 

 placed opposite or near the anterior margin of the fourth 

 molar from the back. The ascending ramus of the jaw of 

 C. septentrionalis is relatively broader and has a slightly more 

 pronounced backward inclination than has that of C. hum- 

 boldtii. The tip of the jaw of the Florida specimen, which 

 should show the anterior teeth, is unfortunately not preserved. 



The pittings on the face of the scutes of C. septentrionalis 

 are stronger than are those on C. humboldtii / the sculpturing 

 also is more strongly marked on the margins of the plates of 

 the movable shield. Moreover, the excellent illustrations of 

 the scutes of C. humboldtii given by Lund* do not show the 

 median keel or ridge which characterizes the plates of the 

 movable hands, as well as many of the other dermal scutes of 

 C. septentrionalis. 



The plates of the movable bands of the two species, and 

 also the dermal scutes, are of approximately the same size. 

 The jaw of C. humboldtii, however, as figured by Lund (1. c, 

 Tredje Afhandling, pi. xiv, fig. 1), the outline of which is 

 shown in figure 1 of this paper, is perhaps somewhat larger 

 than that of the Florida specimen, although a second com- 

 plete jaw subsequently figured by Lundf is no larger than 

 the jaw from Florida, and it is probable that the two species 

 differed little if any in size, being, as estimated by Lund, 

 approximately the size of the modern South American tapir. 



*Lund, P. W., Blik paa Brasiliens Dyreverden forsidste Jordomvsel tiling. 

 K. Danske Vidensk. Selskabs Anden Afhandl., pi. 1, figs. 7-10, 12, 13; pi. 

 xii, figs. 6, 7, 1841. 



flbid., Fjerde Afhandling, ix, pi. xxxiv, fig. 9, 1S43. 



