F(jsKil F/xli Remains. 



67 



surface than the correspundinjz paLital surface of the upper 

 jaw. Denticles of the jaw margin comparatively coarse, and 

 irregular in size, with a vermiculately crinkled surface except 

 ■where worn. In the largest specimen the pile of palatal plates 

 numbers seventeen, whilst in the smallest specimens before us 

 there are only five, and avera/gc sized examples show eleven or 

 twelve. 



These Diodon jaws show very considerable variation in form, 

 both as to the angle of the upper jaw margin, -which ranges from 

 95 degrees to 110 degrees ; and also in the excavated area 

 between the palatal pile and the margin, which is often deeply 

 concave, while the distance between the anterior margin of the 

 plates and the denticulated border vai-ies between 8.5 mm. and 

 18 mm. These measurements were made on full gTOwn 

 examples. 



The shape of the palate is generally suboval, in which the 

 lateral axis is the longer. 



Dimensions of the Jaws of Diodon formosus, based 

 on the more perfect examples. 



« (Circ.) 

 LOWER JAW. 



Locality. 

 Grange Burn 

 Beaumaris 

 Beaumaris 

 Beaumaris 



5a 



