A. E. Yerrill — Earth American Cephalopoda. 
219 
anterior edge of the ala?. The sides of the rostrum are strongly ex- 
cavated toward the base and around the notches, and radially striated. 
The jaws are dark brown, becoming blackish toward the tips. 
Comparative measurements of jaics (in inches).* 
A. Harveji. A. princeps. 
No. 4. No. 5. 
Rec. 
No. 5. 
Later. 
No. 1. 
No. 10. | 
No. 13 No. 13. 
Fr’sh Pres’d. 
No. 
14. 
Upper mandible: 
Length, beak to end of palatine. _ . 
3‘55 
3-85 
5* 
3 - 75 + 
5‘25 
Greatest breadth, palat. to frontal. 
2-49+ 2-S4 
2-60 
3‘50 + 
4-50 3 54 + 
3-88 
Greatest transverse diameter. 
1 
1-45 
.. 1-15 

Inner end of alae to dorsal eDd of 
froutal 
2-50 
.. 
3 + 
.J 2-95 + 
3*75 
Tip of beak to same. 
2-37+ 
2-55 
3-40 + 
.. 3-17 
3-62 
Tip to anterior end of palatine lam- 
ina. 
2-06 
__ 
- 
3’57 
Tip to bottom of notch. 
•63 -69 
•61 
‘75 
•81 -75 
•75 
Notch to end of anterior edge of alae, 
1-10 

1-15 
.. 1-30 
1-50 
Transverse breadth at notch. 
■60 
-- 
.. -63 
.. 
Transverse breadth between edges 
of alae. .. 
. 1 
•69 
Breadth of palatine lamina . 
1-70 
232 
.. 2-30 
End of palatine to edge of frontal 
lamina 
2-20 
3-15 
3-50 
Beak to posterior edge of alae, lat- 
erally. 
- - 
1-40 
-- 
1-95 + 
1-70 
-- 
Loujer mandible: 
Total length, beak to end of gular. 
.. 344 
3 
__ 
363 
3-89 3-24 
375 
Mentum to inner end of alae. 
2-60 + __ 
2 - 55 
.. 3-0S 
-- 
Total breadth, gular lamina to end 
of alae. 
2*65 
.. 3 32 
3-S8 
Breadth of gular lamina 
1-50 
1*75 
.. 1-74 
Anterior edge of alae to end of gular 
lamina - 
2-45 
315 
2-68 
325 
Tip of beak to end of mentum. me- 
diallv 
*85 
1-30 + 
1-68 
.. 1-31 
Tip to end of gular lamina, mediallv. 
1-85 
237 
_J 2-40 
Breadth of alae (laterally) 
118 
•93 + 
1-50 
__| 115 
1-62 
End of gular lamina to alae, laterally, 
- - 
1-50 
1-60 
1-58 
1*75 
Tip of beak to bottom of notch 
•62 '69 
•60 
•67 
■80 
■77 -71 
•87 
Tip to post, edge of alae, laterally. . 
1-67 
1 '50 4- 
2-20 
.. 1-78 
Tip to inner end of alae, 
2-33 2-63 
2-10 + 
3 45 2 67 
-- 
Tip to inner angle of gular lamina. 
1-20 
1-18 
1-85 
1-28 
Notch to inner angle of alae 
1*92 
1-77 
■* 
2-17 
275 
Depth of notch 
12 
12 
•15 
•15 
__ -12 
•13 
Breadth of tooth in front of notch. 
1 -30 
•35 
•32 
-32 
•38 
Spread of jaws, between teeth, 
1 - 1 - 
1 -- 
-- 
| -60 
-.1 -64 
1 -- 
* 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. 
