1888.] NATURAL SCIENCES OF PHILADELPHIA. 263 



The rugse may be convergent on one side and transverse on the 

 other. It is thus seen that the disposition of the rugae to form little 

 clusters is noticeable. 



fiGURB 6. 



The palate is wide but with deep recesses from a moderately high 

 arch back of the sulural rug^. The lateral elements on the left are 

 regular and elongated; those on the right are unusuaUy irregular, 

 and first and second post-suturals very oblique. The median ele- 

 ments on both sides are strangely disturbed. Median concresence 

 exists on both sides. 



The inclination for the third, fourth and fifth rugse on the right 

 side to incline forward is especially marked. 



In 90 specimens I found the right rugse thus inclined in 33, the 

 left only in 2 while in both right and left, 16. In the whole number 

 the inclination of the third rugae is the rule. The disposition is 

 marked in palates with hyperostosis. 



The median half of each ruga may incline independently of the 

 lateral, but the inclined fold is, as a rule, entire. The degree of incli- 

 nation is variable but it may be expected to be so great that the 

 sutural and post-sutural folds may unite. 



The approach of the rugae one to another their entire length is 

 much less frequently seen than the foregoing. The sutural, the 

 third and the fourth post-suturals may be coalescent. In 90 ex- 

 amples this was noted on the right side 9 times, on the left 6 and 

 on both 2. 



The union of the sutural and pre-sutural I have seen but once. 

 It was symmetrical. 



