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A, FE. Verrill— North American Cephalopods. 219 
anterior edge of the ale. 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 jaws (in inches).* 
Upper mandible : 
Length, beak to end of palatine, --} 3°55 
Greatest breadth, palat. to frontal,} 2°49 + 
Greatest transverse diameter, ---- 
Inner end of ale to dorsal end of 
DOG 3 a eee ee 
Haprot beak to same, ......2._-- 
Tip to anterior end of palatine lam- 
Nig ee? oe ace 
Tip to bottom of notch, -_.------. 
Notch to end of anterior edge of alee, 
Transverse breadth at notch, ._-_ .- 
Transverse breadth between edges 
Ol BIER. 6 Sepa oe se eee 
Breadth of palatine lamina, - - - -- -- 
End of palatine to edge of frontal 
LENDING oe ete eee a 
Beak to posterior edge of alee, lat- 
OTUs 5 oo 
Lower mandible: 
Total length, beak to end of gular, 
Mentum to inner end of ale, ---..- 
Total breadth, gular lamina to end 
Ot Dk oS ee ee ee 
Breadth of gular lamina, - - ------- 
Anterior edge of alze to end of gular 
[EnV 2 Se eee 
Tip of beak to end of mentum, me- 
GUN A eee te ee ee 
Tip to end of gular lamina, medially, 
Breadth of alee (laterally), -------- 
End of gular lamina to alee, laterally, 
Tip of beak to bottom of notch, - -- 
Tip to post. edge of alse, laterally, - 
Tip to inner end of ale, -.------- 
Tip to inner angle of gular lamina, 
Notch to inner angle of alee, -- ---- 
Menton notch, 2-2. 5.22.s-22.2=4 
Breadth of tooth in front of notch, 
Spread of jaws, between teeth, --- 
A. princeps. 
a 
No.1. | No. 10. 
No.18! No. 13. | No. 
Fr’sh Pres’. | 14. 
_-| 3°75 +] 5°25 
4°50)3°544+| 3°88 
S5i| ates 
‘81| °75 | -75 
..| 1:30 | 1°50 
Se | eam (eae 
Al 69 
<2 -o-a0) aes 
_.| -. | 3°50 
ONT Fo" Vs 
..| 3°08 -- 
_-| 3°32 | 3°88 
ice! = 
_-| 2°68 | 3°26 
LA eae =F 
_.| 2°40 <a 
_.| 1°15 | 1:62 
--| 168 | 1°75 
oy ye 
se 1-78 ee 
3°45| 2°67 we 
Bai nae i fe 
5) SPF S18 
sal be 13 
i ga, a8 
Solr ee. iy 
* 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. 
