278 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [68] 



The exposed parts of the jaws are black and polished; their internal 

 laminre are reddish brown, becoming translucent yellowish toward the 

 margins. 



The upper mandible (Plate XIV, fig. 5) has an elongated, tapered, 

 considerably incurved, and sharp rostrum ; the notch is rather narrow 

 and deep, and a well-developed, triangular, lateral groove runs down 

 from the notch for some distance, its upper border being in line with 

 the cutting edge of the rostrum. The anterior edge of the aloe, so far 

 as normally exposed, is nearly straight, but slightly undulated. 



The lower mandible (Plate XIV, fig. G) has the cutting edges of the 

 rostrum slightly concave, with a slight notch close to the tip, which is 

 small and incurved ; the notch at the base is broad and shallow, bor- 

 dered externally by a slight, angulated ridge ; the exposed anterior 

 edges of the aire have each two slight lobes, but are otherwise nearly 

 straight ; the aire are broader toward the inner end, which is obtusely 

 rounded. 



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

 posterior dorsal border of the mentum, 13 mm ; tip to the extreme pos- 

 terior end of the gular lamina, 50 mm ; to the dorsal angle of the same, 

 33 mm ; tip to the inner end of the aire, 4G mm ; to the bottom of the notcb, 

 13 mm ; breadth of aire, 24 ram ; transverse breadth at notches, 12 mm . 



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

 palatine lamina, is 71 ram long; from tip of beak to end of frontal lamina, 

 53 mra ; to bottom of notch, ll mm ; length of exposed (dark) portion of 

 anterior edge of aire, 14 mm . 



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

 ginal membrane, yellowish white in color, becoming brown and thick- 

 ened 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 grad- 

 ually to the obtuse end; the dorsal portion is considerably longer, 

 abruptly bent backward, with the borders incurved, gradually decreas- 

 ing 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 rudi- 

 mentary 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, frorn anterior bend to posterior tip of dorsal 

 end, 22 mm ; to tip of ventral end, 14 mm ; breadth of lateral membrane, 

 in middle, ll mm ; of dentigerous belt, anteriorly, 3 mm . 



Tbe following measurements were made by Mr. Dall froir the fresh 

 snecimens: 



