[123] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 333 



this buccal collar is connected to the interbrachial membrane by six 

 membranous bridles, corresponding to the six lobes ; on both sides of the 

 dorsal and ventral bridles are large pouches. The beak (Plate XXIV, 

 fig. 4) is immediately surrounded by a thick, fleshy, lobed and wrinkled 

 collar, and outside of this by another less prominent and less wrinkled 

 one. 



The exposed parts of the mandibles- are black, the inner laminae 

 bright reddish brown. The beak of the upper mandible is very acute, 

 strongly incurved, with scarcely any distinct notch at the base of the 

 cutting edge, but with a conspicuously-excavated V-shaped area; the 

 anterior edges of the alae are irregularly and slightly denticulate or 

 crenulate. The lower mandible has a much incurved beak, with the 

 cutting edges decidedly concave, and a very small notch at their bases, 

 but with abroad excavated area along their sides and bases; the ante- 

 rior edges of the alae are slightly convex and form a very obtuse angle 

 with the edges of the beak or rostrum; a small, thin tooth exists just 

 beyond the notch; the alse are broadest near their inner ends; the 

 gular lamina is peculiar in having a prominent, thickened, curved, lat- 

 real rib on each side, running to the end of the prolonged and subacute 

 lateral lobes, and another dorsal one, running to the dorsal emargina 

 tion. Length of upper mandible, 30 rara ; hight, palatine to frontal, 20 mm ; 

 bight (or breadth) of palatine, 14 mm ; tip of beak to end of frontal, 22 mm ; 

 to base of cutting edge (notch), 7.5 mm ; notch to inner end of alas (union 

 with palatine), 7.05 mm ; beak to posterior lateral border of alae, 13.5 mm ; 

 transverse breadth across outer side of alas, 9.5 mm . Lower mandible, 

 length, 23 mm ; inner ends of alae to mentum, 22.5 mm ; tip of beak to dorsal 

 border of gular lamina, 17 mm ; to inner ends of alae, 18 mm ; to notch, 8.5 mm ; 

 breadth of alae in middle, 8 mm ; greatest transverse breadth across alae, 

 23^ ; across anterior edge, at teeth, 7.5 ram ; notch to union of gular lamina 

 and alae, 6.5 mm ; breadth of gular lamina, 12.5 mm . 



The odontophore is rather short, the dorsal portion not much exceed- 

 ing the ventral in length ; the lateral membrane is broad and thin, its 

 posterior border extending transversely straight across to the dorsal 

 fold, nearly at right angles to the dorsal portion of the odontophore; 

 the dentigerous portion, including a thickened lateral ridge outside 

 the teeth, is light red in color. Length of dorsal portion, from anterior 

 bend, 8.5 mm ; of ventral portion, 8 mm ; breadth of dentigerous zone, 3 mm . 



The median teeth (Plate XXIV, fig. 6, a) are short, with a strongly in- 

 curved, acute central point, and with small, inconspicuous or rudimentary, 

 blunt, lateral denticles on each side; the inner lateral teeth (b) are longer, 

 without a distinct lateral denticle ; the two outer rows have simple, rather 

 slender, strongly incurved, acute teeth, the outermost a little longer 

 and more slender. The plates along the border appear to be so closely 

 united as not to be easily separated entire; they form a continuous but 

 slight, narrow ridge, which has an undulated surface. The membrane 



