16 NORTH AMERICAN MUSTELID.E. 



surface; while tlie seeretioOj which is always plentiful, here 

 acquires an unparalleled fetor. In the Badgers, on the contrary, 

 these anal glands are not the only secretory organs ; there being 

 in addition a particular snbcaudal pouch surrounded by a race- 

 mose gland, which produces a peculiar liquid. 



"This brief summary of the leading modifications of the 

 perimeal glands of Mustelidcv suffices to show that several dif- 

 ferent types are included in that group "* 



ON THE EXTINCT MUSTELINE OF NORTH AMERICA. 



The following fossil species of North American Mustelinw 

 have been described : — 



1. Miistela iiiustclina, (Cope). 



Aelurodon iiiusteUniis, Cope, Palaeont. Bull. no. 14, July 25, 1873, 1. 

 Martes niusteHlius, Cope, Ann. Eep. U. S. Geol. Surv. for 1873, 1874, 520. 

 Mustela parvlloba, Cope (change of name on reference of the species to Mustela). 



Pliocene. Loup Fork epoch. 



"A small, single-rooted second molar of the lower jaw. First 

 molar sectorial, with a rather narrow posterior heel, one-third 

 its length, and a small inner tubercle at the bjise of the second 

 outer cusp. Last premolar with a short posterior heel, and dis- 

 tinct outer tubercle on the posterior side of the cusp. Margin 

 of jaw strongly everted below masseteric fossa. 



^'Measurements. 



M. 



" Length of three hist molars 0. 018 



"Length of sectorial molars 010 



" Width of sectorial molars (greatest) 005 



" Height of posterior cusp (greatest) 005 



"This species was about as large as the domestic cat, and 

 less than one-third that of Aelurodon ferox^ Leidy." {Quoted 

 from the second reference above cited.) 



2. Mustela iiaiiibiana, (Cope). 



Martes namliiaiia, Cope, Proc. Acad. Xat. Sci. Thila. 1S74, 147. 

 '"?Putorius iiambianiis", Cope, 



From the Santa Fe (N. Mex.) Marls. Pliocene. 



"Kepresented by a mandibular ramus which supports three 

 teeth. The anterior blade of the sectorial is rather obtuse. The 

 first premolar is one-rooted; the second and third are without 



* But M. Chatin, regarding the family iu the perspective of his special 

 studies, may he considered not to have given due weight to other points of 

 structure, the sum of which, as I believe, indicates that the Mustelida', as 

 defined in the present work, are a homogeneous and natural as.semblage of 

 genera, of tbe grade usually held to represent family value. 



