[ 123 ] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
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 a he 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 a broad excavated area along their sides and bases; the ante¬ 
rior edges of the aim 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 aim 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 mm ; bight, palatine to frontal, 20 ram ; 
bight (or breadth) of palatine, 14 rmn ; tip of beak to end of frontal, 22 raro ; 
to base of cutting edge (notch), 7.5 mm ; notch to inner end of aim (union 
with palatine), 7.05 mm ; beak to posterior lateral border of aim, 13.5 mm ; 
transverse breadth across outer side of aim, 9.5 mm . Lower mandible, 
length, 23 mm ; inner ends of aim to mentum, 22.5 mm ; tip of beak to dorsal 
border of gular lamina, 17 mm ; to inner ends of aim, 18 mm ; to notch, S.5 mm ; 
breadth of aim in middle, S mm ; greatest transverse breadth across aim, 
23 mm ; across anterior edge, at teeth, 7.5 mm ; notch to union of gular lamina 
and aim, G.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; tfle 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 ram . 
The median teeth (Plate XXIV, fig. G, 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 (6) 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 
