218 A. E. Verrill — JVbrth American Cephalopods. 



the harder portions have decreased from 5 to 10 per cent, from the 

 measurements taken "when first received by me.* When first received 

 in 1875, the upper mandible measured Hi""" in total breadth (front 

 to back); 88'""' from tip of beak to anterior end of palatine lamina; 

 20™"' from tip of beak to the bottom of the notch. The lower man- 

 dible measured 96"'™ in total length ; 80'""' from tip of beak to inner 

 end of alse ; 19™™ from tip to bottom of notch. 



At the present time (Jan., 1880), the breadth of the upper mandible 

 is about 90™™ ; from tip of beak to anterior end of palatine lamina (at 

 junction with anterior edge of aloe) 89"'™ ; tip of beak to bottom of 

 notch, 19'"™; breadth of palatine lamina, 58™™ ; beak to posterior end 

 of frontal lamina, 90™™ ; beak to posterior lateral edge of alffi, 43™™ ; 

 notch to end of anterior edge of alae, 33™™ ; notch to end of hardened 

 or black portion of same (proper cutting edge), 17™"'; transverse 

 breadth at notches, 16™™. The lower mandible measures, in length, 

 82™™ ; beak to inner end of alse, 67 ; to bottom of notch, 18 ; breadth, 

 alse to mentum, 78 ; end of alse to outer side of gular lamina, 84 ; 

 inner side of gular to mentum, 50 ; breadth of gulai', 44 ; bieadth of 

 alae, anterior to posterior edge, laterally, 29; tip of beak to posterior 

 ventral end of mentum, 33 ; tip to posterior lateral border of ahv, in 

 line with cutting edge of rostrum, 45™™ ; posterior lateral border of 

 alte to end of gular, 40 ; depth of notch, 3 ; breadth of tooth, 8 ; 

 notch to end of cutting or liardened edge of alas, 20; to inner end of 

 alae, 55; breadth transversely, across teeth, 16™™, (see also table of 

 measurements of jaws). 



The beak of the upper mandible is sharp, strongly and regularly 

 curved, most so near the tip ; a radial ridge runs from the notch to 

 the lateral border of the alas ; the anterior or cutting edges of the ala3 

 are somewhat convex and irregularly crenulate. The lower mandible 

 has a sharp beak, with a slight notch close to the tip; the cutting 

 edges of the rostrum are otherwise nearly straight; the notches at the 

 base are deep and narrow V-shaped. The teeth are rather prominent, 

 obtuse, slightly bilobed at the summit ; the one on the right side of 

 the mandible is more prominent than the other, owing to the fact 

 that the edge of the ala, beyond it, is more concave in outline. There 

 is also a broad and slightly prominent lobe in the middle of the 



* There is no reason to suppose that the shrinlcage has been any more in this case 

 than in the others, but I have not had an opportunity for mailing comparative meas- 

 urements from the same specimens when recently preserved, and again after long pre- 

 servation in alcohol, except in one other instance (Xo. 5), in which a similar shrinkage 

 was evident. 



