A. E. Vhrrill — North American Cephalopods. 



249 



The lower mandible now measures, from the tip of the rostrum to 

 the posterior dorsal border of the mentum, IS™'"; tip to the extreme 

 posterior end of the gular lamina, SO""'" ; to the dorsal angle of the same, 

 33™'" ; tip to the inner end of the alae, 46™™ ; to the bottom of the notch, 

 13™™; breadth of alae, 24™™; transverse breadth at notches, 12™™. 



The upper mandible, from the tip of the beak to the end of the 

 palatine lamina, is 7i"'"i long; from tip of beak to end of frontal 

 lamina, 53™™; to bottom of notch, H™™; length of exposed (dark) 

 portion of anterior edge of alte, 14™"'. 



The odontophore (Plate XXIY, figs. 1-4), has a very broad, thin, 

 marginal membrane, yellowish-white in color, becoming brown and 

 thickened toward the dentigerous portion, where there is a row of 

 very small, thin plates, bordering the outer row of teeth ; the ventral 

 portion of the dentigerous band is dark brown, regularly convex, and 

 narrowed gradually to the obtuse end ; the dorsal portion is consider- 

 ably longer, abruptly bent backward, with the borders incurved^ 

 gradually decreasing to the posterior end ; on this part the teeth 

 become much smaller and paler. 



The outer lateral teeth, on the anterior portion, are long, slender, 

 sharp, and strongly curved ; the median ones are much shorter, with 

 a sharp, strongly curved central point and a very small, almost 

 rudimentary denticle on each side ; the inner laterals are a little 

 longer than the median, with a stout incurved point ; on the outer 

 side of its base there is a small denticle ; the teeth of the two outer 

 rows, on each side, are simple. 



Length of odontophore, from anterior bend to posterior tip of dor- 

 sal end, 22™™; to tip of ventral end, 14™™ ; breadth of lateral mem- 

 brane, in middle, 11'""^ ; of dentigerous belt, anteriorly, 3™™. 



The following measurements were made by Mr. Dall, from the 

 fresh specimens. 



Table of measurements (in inches). 



No. 3. 



Total length (to mutilated ends of tentacles),.. 



Base of arms to tip of tail (head and body), 



Base of arms to edge of mantle (head). 



Edge of mantle to tip of tail (body ), 



Length of tail-fins (insertion to tip), 



Breadth of tail-fins, - 



Length of • pen,' 



Breadth of pen, in middle, 



Length of tentacular-arms (ends gone), 



Length of longest sessile arms (ends gone), 



Diameter of body, 



Breadth between insertions of fins, 



Diameter of eye, 



Trans. Conx. Acad., Vol. V. 31 



167 + 

 102 



10-5 



91-5 



48 



42 



89 



12-25 



61 + 



40 + 



18 



5 

 1-25 



February, 1880. 



