148 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



pm * nonsectoria] ; molarif orm teeth with inner cingulum undevel- 

 oped and supplementary or accessory cusplets almost entirely want- 

 ing. Incisors lighter and weaker than in Procyon, the upper central 

 pairs in line and in contact, the fronts of outer (i^) back on level 

 with posterior border of alveoli of middle incisors and separated from 

 the middle pairs by a considerable diastema; lower incisors protruding 

 forward. Canines much compressed laterally, the points turned out- 

 ward. Premolars all two or three rooted; first three premolars single 

 cusped, the middle two with wide cingulum shelf and heel; pm* with 

 very well-developed hjrpocone. (Plates 38 and 39.) 



NASUELLA, neAA/" genus. 



Type. — Nasua olivacea meridensis Thomas. 



Characters. — In general like Nasua, but smaller, with much shorter 

 tail. Compared with Nasua, the skuU of Nasuella is small and weak, 

 the rostrum long and slender with the middle greatly constricted 

 laterally. The palate extends still farther beyorij:! plane of the last 

 molar; the palatine bones are fan-shaped anteriorly and completely 

 fill the space to the maxillary tuberosities; the molar-premolar row 

 is so shortened that the posterior border of the last molar hes on a 

 line with the most anterior border of orbit, leaving the maxillary 

 tuberosity as a long shelf; audital bullae small and flattened. Man- 

 dible lightly built, the ascending ramus short. 



.31 4 2 

 Dental formula : 'i oC j pm ^ m ^ = 40. 



Teeth all greatly reduced in size and approaching in many charac- 

 ters the teeth of Bassancyon; relatively and actually much smaller 

 than in Nasua, Bassaricyon, and Potos; low crowned and sharply 

 cusped, decidedly of a general insectivorous type; pm* nonsectorial; 

 maxillary row, without the disconnected pm^, less than one-fifth 

 the greatest length of skull; maxillary teeth all longer than broad; 

 diastema between incisors and canine proportionally greater than in 

 Nasua, between canine and pm^ and between pm^ and pirr very 

 much greater; lower premolar series also much interrupted. Incisors 

 as in Nasua, but outer (i^) farther back from posterior alveolar plane 

 of central four; and lower row much more ])rotruding, the teeth 

 ahnost horizontal, and on a line parallel with alveolar line of man- 

 dibular tooth row. Canines excessively flattened, saberlike, and 

 outwardly bowed. First two upper premolars compressed cones, 

 third with postero-internal shelf; fourth with three cusps only, the 

 hypocone wanting. First upper molar subquadrate, four-cusped; 

 very little larger than m^. Lower molars much compressed, of 

 nearly equal size. (Plates 38 and 39.) 



