SKULL AND TEETH OF GULO LUSCUS. 39 



Mustela^ though it is more massive, but the coronoid is differ- ftrv^^ 

 ent. Its back border rises straight aud perpendicularly, the 

 anterior border curving strongly backward to meet it in a 

 rounded obtuse apex. In Mustela, the borders gradually ap- 

 proximate to each other and meet more acutely. M. pennantl 

 alone is much like Gido in this respect. 



Eeviewing general cranial characters from the small Gale to 

 the large Giilo, we see with increase of mere size a correspond- 

 ing increment of massiveness; a graduation in obliquity of the 

 plane of the end of the muzzle j a lengthening and constriction 

 (on the whole) of the rostrum ; an increase of the convexity of 

 the upper profile j a depression of the zygomata from regular 

 arches to a shape higher behind and more nearly horizontal in 

 continuity; enlargement of paroccipitals aud mastoids; con- 

 striction and lateral elongation of the bullae into auditory 

 tubes; and a flattening and widening behind, and correspond- 

 ing contraction in front of, the brain-box. 



The dentition shares the general massiveness of the cranium. 

 Compared with those of Miistela, the teeth, if not relatively 

 larger, are more swollen and stouter, with bulging sides, blunt 

 points, and dull edges. The back upper molar is placed so far 

 inward, out of line with the rest, that its outer border scarcely 

 projects outside the inner border of the next. It has the same 

 general character as in Mustela. The median constriction is 

 slight, the inner more strongly regularly convex, with raised 

 brim and crescentic ridge inside this ; the outer is double con- 

 vex (convex with an emargination), higher than the other, with 

 an irregularly tuberculous surface. The autero-internal spur of 

 the last premolar is low and little more than a mere heel, 

 scarcely to be called a cusp. Turgidity aside, this tooth other- 

 wise repeats the same in Mustela. The next premolar abuts 

 against the reentrance between the spur and main body of the 

 last one, rather than lies in continuation of the same axis. The 

 foremost premolar is relatively smaller and more crowded than 

 the same in Mustela ; it rests directly against the canine, to 

 the inner side of the general axis of dentition. It would seem 

 that but little more crowding would cause this tooth to perma- 

 nently abort. The great canines are extremely stout at the 

 base, rather blunt, and have a strong forward obliquity. Of 

 the six upper incisors, the lateral pair are, as usual, much 

 larger (wider and deeper, though little, if any, longer) than the 

 rest. They are usually found much abraded by rubbing 



