PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 63. 



Svecific characters. — Mj to m.^ = 9.4 mm.; c (posterior border of 

 alveolus) to ma =17.2 mm. Single enlarged and slightly compressed 



Fig. 1.— Par )Momys maturus. Portion of a eight lower jaw carrying posterior foue 

 cheek teeth. a, crown view of teeth; b, inner side view of jaw and teeth. x4/1. 

 Cat. No. 9473. 



incisor as in Tetonius, hut with canines enlarged also as in Omomys; pj and 

 Pg much smaller than p^ ; paraconids internally placed and in m.^ and mj 

 nearly connate with the 

 metaconid, their sum- 

 mits often disappearing 

 with slight wear ; m^ nar- 

 rowest but longest of 

 molar series, with wide 

 bicuspid heel as in Noth- 

 arctus nunienus (Cope) . 



PAROMOMYS DEPKES9I- 

 DENS, new species. 



Figure 3, and Plate 3, Fig- 

 ure 7. 



Type. — Portion of a 

 right maxiUary carry- 

 ing four teeth, p* to m'. 

 (Cat. No. 9 546, U.S. 

 N.M.Coll.) Represented 

 in the collection by sev- 

 eral other specimens in- 

 cluding both upper and 

 lower jaw portions. 



Locality and horizon.- 

 Same as P. maturus . 



Specific characters. — About one-fourth smaller than P. maturus. 

 P^ to m^ = 7.3 mm., m* to m^ = 5.5 mm. Cusps and lophs depressed 



Fig. 2.— Paeomomys maturus. Poetion of left maxillary 



with posterior foue CHEEK TEETH. .4, PALATE VIEW. B, 

 OUTER SIDE VIEW. X 4/1. CAT. NO. 9540. 



