A. E. Yerrill — North Araerican Cephalopods. 



219 



anterior edge of the ahv. Tlie sides of the rostrum are strongly ex- 

 cavated tOAvard the base and around the notches, and i-adially sti'iated. 

 The jaws are dark brown, becoming blackish toward the tips. 



Comparative measurements of jaics (in inches).* 



Upper mandihie: 



Length, beak to end of palatine, . . 



Greatest breadth, palat. to frontal 



Greatest transverse diameter, 



Inner end of alae to dorsal end of 



frontal, 



Tip of beak to same, 



Tip to anterior end of palatine lam 



ina, 



Tip to bottom of notch, 



Notch to end of anterior edge of alse, 

 Transverse breadth at notch. . . . 

 Transverse breadth between edges 



of alse, .- 



Breadth of palatine lamina, 



End of palatine to edge of frontal 



lamina, 



Beak to posterior edge of alae, lat- 

 erally, 



Loiver mandible : 



Total length, beak to end of gnlar 



Mentiim co inner end of alte, 



Total breadth, gidar lamina to end 



of a\ee. 



Breadth of gular lamina, 



Anterior edge of alae to end of gular 



lamina, 



Tip of beak to end of mentum, me- 

 dially, 



Tip to end of gular lamina, medially. 



Breadth of alse (laterally), 



End of gular lamina to al;e, laterally, 



Tip of beak to bottom of notch, 



Tip to post, edge of ala;, laterally, . 



Tip to inner end of ate, 



Tip to inner angle of gular lamina. 



Notch to inner angle of alse 



Depth of notch. 



Breadth of tooth in front of notch, 

 Spread of jaws, between teeth, 



A. Harveyi. 



3-55 

 2-49 + 



2-37 + 



•63 

 •60 



No. 5. 

 Rec. 



2-60 + 



1-18 



•62 

 1-67 

 2^33 

 1^20 

 1-92 

 •12 

 ■30 



2^84 



2^06 

 •69 



3-44 



•69 

 2-63 



No. 5. 

 Later. 



3^85 

 2-60 

 1 



2^50 

 2^55 



•61 

 1-10 



A. princeps. 



No. 1. No. 10. 



No.131 No. 13. 

 Fr'sh Pres'd. 



1-70 

 2^20 

 1-40 



3 

 2^55 



2-65 

 1-50 



2-45 



•85 

 1^85 



•93 + 

 1^50 



•60 

 r50 + 

 2-10 + 

 I^IS 

 ^77 



•12 



1-30 + 



■67 



•15 

 •35 



5^ 



3^50 + 

 1^45 



3 + 

 3^40 + 



•75 

 1-15 



2^32 

 3^15 

 1^95 + 

 363 



1^75 



3^15 



1-68 

 2-37 

 1-50 

 1^60 

 ■80 

 2^20 



r85 



■is 



■32 

 •60 



4^50 



3-57 

 •81 



3-75 + 

 3^54 + 

 1^15 



2-95 + 

 3^17 



•75 



1-30 



■63 



1 

 2^30 



1-70 



3^89 3 

 .- 3 



..' 2 



--I 1 

 .-' 2 

 1 

 1 



•77 



3-45 



24 

 08 



32 

 74 



68 



31 

 40 

 15 

 58 

 71 

 78 

 67 

 28 

 17 

 12 

 32 

 64 



No. 

 14. 



5^25 

 3^88 



3-75 

 3^62 



•75 

 1-50 



•69 

 350 



3'75 

 3^88 

 3-25 



1^62 



1-75 



•87 



2^75 

 •13 



•38 



* Xos. 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. 



