XVI INTRODUCTION. 



These comprise a memoir on Cetacea from the Belgian Crag, 

 by Prof. Yan Beneden, in the ^Ann. Mus. E. Hist. Nat. Belg.' 

 vol. xiii. pt. 5 (1886), containing figures and descriptions oiAmphi- 

 cetus, Heterocetus, Mesocetus, Idiocetus, and Isocetus ; one by Dr. "W. 

 B. Scott, " On some New and Little-known Creodonts," in the 

 ' Journ. Ac. Nat. Sci. Philad.' vol. ix. pt. 2 (1886) ; and a third, by 

 Dr. Burmeister, forming a continuation of the ' Atlas de la Descrip- 

 tion Physique de la Hepublique Argentine,' — Osteologie der Gravi- 

 graden, pt. i. Scelidotherium and Mylodon (Buenos Ayres, 1886)\ 

 In the latter (p. 103) the MS. name Scelidotherium magnum is 

 revived for S. tarijense (infra, p. 102) ; while the new species Mylo- 

 don oweni ^ (p. Ill) may be identical with M. lettsomi {infra, p. 108). 

 The cranium represented in pi. xiv. figs. 2, 3, as Scelidotherium 

 lejptocephalum appears to belong to S. bravardi (infra, p. 96), and 

 shows (as I thought to be the case) that the length of the nasals is 

 less than half that of the entire cranium. 



July 26, 1887. ^' L- 



^ This is the portion of the Atlas alluded to by myself in the ' Proc. Zool. 

 See' 1886, p. 491 ; its publication having apparently been long delayed. 



^ The names applied to these forms by Bravard can hardly be reckoned as 

 more than MS. ones. 



