[49] CEPHALOFODS OF NORTHEASTERN COAST OF AMERICA. 259 



Comparative measurements of jaws (in inches).* 



A. Harveyi. 





A. princeps. 





UPPER MANDIBLE. 



Length, beak to end of palatine 



Greatest breadth, palatine to frontal 



Greatest transverse diameter 



Inner end of aire to dorsal end of frontal. . 



Tip of beak to same 



Tip to anterior end of palatine lamina 



Tip to bottom of notch . 



Notch to end of anterior edge of aire 



Transverse breadth at notch 



Transverse breadth between edges of aire 



Breadth of palatine lamina 



End of palatine to edge of frontal lamina 

 Beak to posterior edge of aire, laterally. . . 



3. 55 

 2.49 + 



2.84 



2.37 + 

 763"" 



"."60 " 



3.85 



2.60 



1 



2.50 



2.55 



2.06 

 .69 



5 



3.50 + 

 1.45 

 3 + 

 3.40 + 



3.75 + 

 3.54 + 

 1.15 

 2.95 + 

 3.17 



.61 

 1.10 



.75 

 1.15 



3.57 

 .81 



LOWEH MANDIBLE. 



Total length, beak to end of gular 



Mentniu to inner end of aire 



Total breadth, gular lamina to end of aire 



Breadth of gular lamina 



Anterior edge of alae to end of gular 



lamina , 



Tip of beak to end of mentum, medially. 



Tip to end of gular lamina, medially 



Breadth of aire, laterally 



End of gular lamina to aire, laterally 



Tip of beak to bottom of notch , 



Tip to posterior edge of aire, laterally. . . 



Tip to inner end of aire 



Tip to inner angle of gular lamina 



Notch to inner angle of aire 



Depth nt notch 



Bread! h of tooth in front of notch 



Spread of jaws between teeth 



3.44 



2.60 + 



1.18 



.62 

 1.67 

 2.33 

 1.20 

 1.92 

 .12 

 .30 



.69 

 2.63 



1.70 

 2. 20 

 1.40 



3 



2.55 

 2. 65 

 1.50 



2.45 



.85 

 1.85 



.93 

 1.50 



.60 

 1.50 

 2.10 

 1.18 

 1.77 



.12 



2.32 

 3.15 

 1.95 + 



3.63 



.75 

 1.30 



.63 

 1 

 2.30 



1.30 + 



.15 

 .35 



1.75 



3.15 

 1.68 

 2. 37 



1.50 



1.60 



.80 



2.20 



.77 

 3.45 



1.85 



.15 

 .32 

 .60 



1.70 



3.24 

 3.08 

 3.32 

 1.74 



2.68 



1.31 



2.40 



1.15 



1.58 



.71 



1.78 



2.67 



1.28 



2.17 



.12 



.32 



.64 



5.25 

 3.88 



3.75 



.75 

 1.50 



3.50 



3.75 

 "3." 88 



3.25 



1.62 



1.75 



.87 



2.75 

 .13 

 .38 



* Nos. 1 and 10 had been dried for many years. All the others had been preserved in alcohol — Nos. 4 

 and 13 for several years ; No. 5 about one year ; No. 14 for only a few days. The amount of shrinkage 

 is considerable in those preserved long in alcohol or dried. 



