166 



BAL«lfOPTERID^. 



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

 coronoid process, and a considerable but not excessive curve. 



"Dimensions {in inches) of SkiUls of different examples of Physalus 

 antiquorum and of the specimen at Utrecht. 



Jbov 



all 







Iiength of skull in a Btraight line 



Breadth of condyles 



Breadth of exoceipitals 



Breadth of squamosals (greatest breadth 

 of skull) 



Length of Bupraoccipital 



Length of articular process of squamosal . . . 



Orbital process of frontal, length 



Orbital process of frontal, breadth at base "j 

 (from curved border of maxillary to I 

 hinder edge of orbital process of frontal) J 



Orbital process of frontal, breadth at upper \ 

 surface of outer end J 



Nasals, length 



Nasals, breadth of the two, at posterior end 



Nasals, breadth of the two, at anterior end 



Length of beak (from curved border of"! 

 maxillary to tip of beak) J 



Length of maxUlary 



Projection of maxillary beyond premaxillary 



Breadth of maxillaries at hinder end 



Breadth of maxillaries across orbital pro- 

 cesses (following curve) 



Breadth of beak at base (all ttie 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 maxiUary at the same point.... 



Breadth of premaxUlary at same point ..., 



Breadth of beak at middle 



Breadth of maxillary at middle 



Breadth of premaxillary at middle 



Breadth of beak at tmree-quarters of its 

 length from base 



Breadth of maxilUiry 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 l 

 inner surface of the jaw from a straight I 

 line drawn between the extremities) ... J 



118 

 15 

 36 



60 



27 

 28 

 19i 



32 



13 



6i 



5i 

 6 



73 



86 



5 



15 



64 



13i 

 3 



32 



11 

 4 



22 



112 

 18 



11 



184 

 12 

 56 



96 



41 

 36 

 32 



34 



18 



8i 

 6 

 9i 

 133 



145 



9 



17 



89 

 56 



45 



13^ 

 6 



33 

 9i 

 5i 



18J 



5 



3i 

 180 

 21 



186 

 14 

 55 



86 



37i 



34 



30 



32 



179 

 12 

 54 



78 



38 

 35 

 29 



35 



126 



39 



60 



26 

 25 



17 



7 



^ 



7i 



132 



142i 

 10^ 

 17 



88 

 54 



45 



14J 



5 

 36 

 10 



6 



23 



5 



5 



177 



23 



13 



24 



18 



8i 

 3 

 9 



119 



137 



8 

 15 



84 

 55 

 42 



3^ 



10 



5 



21 



44 

 44 



25 

 12i 



a 



4 

 64 

 79 



86 



9 



14 



60 

 38 



26 

 74 

 4 



111 



114 

 38 



56 



26 

 24 

 19 



21 



124 



7 

 3 

 6 



75 



87 



13 



57 



30 



10 

 3i 

 22i 



7i 

 3 



K 



3 

 24 

 112 

 15 

 71 



15 



Flower, P. Z. S. 1864, 411. 



" In aU.the characters by which the atlas of Physalus differs from 

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



