IGO 



BAL^NOPTEKID^. 



narrowed externally. The lower jaw is massive, has a high, pointed 

 coronoid process, and a considerable but not excessive curve. 



'Dimensions (in inches) of Skxlls of different examples 0/ Physalus 

 antiquorum and of the specimen at Utrecht. 



Length of skull in a straight line 



Breadth of condyles ^ 



Breadth of exoccipitals 



Breadth of squamosals (greatest breadth 1 

 of skull) ] 



Length of supraoccipital 



Length of articular process of squamosal ... 



Orbital process of frontal, length 



Orbital process of frontal, breadth at base \ 

 (from curved border of maxillary to \ 

 hinder edge of orbital process of frontal) J 



Orbital process of frontal, breadth at upper 1 

 surface of outer end J 



Nasals, length 



Nasals, breadtli of the two, at posterior end 



Nasals, breadth of the two, at anterior end 



Length of beak (fi-om curved border of | 

 maxillary to tip of beak) J 



Length of maxillary 



Projection of maxillary beyond premaxillary 



Breadth of maxillaries at hinder end 



Breadtli of maxillaries across orbital pro- 

 cesses (following curve) 



Breadth of beak at base (all the measure- 

 ments across the beak include the curve 

 of the upper surface) 



Breadth of beak at one-quarter of its length 

 from base 



Breadth of maxillary at the same point..., 



Breadth of premaxillary at same point .... 



Breadth of beak at middle 



Breadth of maxillary at middle 



Breadth of premaxillary at middle 



Breadth of beak at three-quarters of its 

 length from base 



Breadth of maxillary at same point 



Breadth of premaxillary at same point 



Length of lower jaw in a straight line 



Height at coronoid process 



Height at middle 



Amount of curve (greatest distance of the ) 

 inner surface of the jaw from a straight i 

 line drawn between the extremities) ... J 



118 

 15 

 36 



60 



27 

 28 

 19^ 



22 



13i 



3 



32 



11 



4 



22 



5^ 



112 



18 



5 8 =3 



11 



5 



184 

 12 

 56 



96 



41 

 36 

 32 



34 



18 



8i 

 6 



n 



133 



145 



9 



17 



89 



56 



45 

 13* 



9i 

 5i 



Hi-^ 



186 

 14 



55 



86 



37i 



34 



30 



32 



17 



7 



7i 



132 



142. 

 10, 

 17 



18^ 



5 



3i 

 180 

 21 



179 

 12 

 54 



78 



38 

 35 

 29 



35 



18 



8^ 

 3 

 9 



119 



137 



8 



15 



84 



54 55 



45 



14i 



5 

 36 

 10 



6 



23 



5 



5 



177 



23 



13 



24 



42 



13^ 



6 

 32 

 10 



5 



21 

 4i 



'^1 



§0 a. 



O . u 



126 

 14i 

 39 



60 



26 

 25 



25 



12* 



8^ 



4 



6^ 



79 



86 



9 



14 



60 



38 



111 



lU 



38 



56 



26 

 24 

 19 



21 



12i 



7 

 3 

 6 



75 



87 



i's 



57 

 39 



30 



10 



3i 

 22i 



7i 



3 



13 



3 



2i 

 112 

 15 

 73 



15 



Flower, P. Z. S. 18G4, 411. 



" In all the characters by which the atlas of Physalus differs from 

 that of Sibbaldins, the present specimen agrees with the former. 



