236 
A. E. Verrill — North, American Cephalopoda. 
in diameter; their apetures 2 ,nm ; length of pedicels 4 to 5 ,um . The 
largest suckers on the ventral arms are not so large as those on the 
others ; the largest are 4 mm in diameter. Only a few suckers (5 
or 6), and these of very small size and nearly in one row, extend 
below the level of the ventral web, which is attached along the inner 
margin, inside the row of suckers. The larger ventral suckers are 
depressed and oblique, with a very one-sided horny ring, which has 
a small oblique aperture, with about three bluntly rounded, slightly 
prominent lobes or denticles on the outer margin ; while the inner 
margin is smooth. 
The membranes about the mouth are arranged nearly as in Omma- 
strephes. The mouth is surrounded externally by a broad, elevated, 
smooth, dark chocolate-brown buccal membrane or collar, which is 
prolonged into six angular lobes, corresponding to all the intervals 
between the arms, except those between the 2d and 3d pairs; this 
buccal collar is connected to the interbrachial membrane by six mem- 
branous bridles, corresponding to the six lobes; on both sides of the 
dorsal and ventral bridles are large pouches. The beak is immedi- 
ately 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 a broad excavated area along their sides and bases; the 
anterior 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 alae are broadest near their inner 
ends ; the gular lamina is peculiar in having a prominent, thickened, 
curved, lateral rib, on each side, running to the end of the prolonged 
and subacute lateral lobes; and another dorsal one, running to the 
dorsal emargination. Length of upper mandible, 30 mm ; height, pal- 
atine to frontal, 20; height (or breadth) of palatine 14; tip of beak 
to end of frontal, 22 ; to base of cutting edge (notch), 7 5 ; notch to 
inner end of alae (union with palatine), 7*5 ; beak to posterior lateral 
border of ahe, 13*5; transverse breadth across outer side of alae, 
9-5. Lower mandible, length, 23 mm ; inner ends of alae to mention, 
22 5; tip of beak to dorsal border of gular lamina, 17 ; to inner ends 
of alae, 18 ; to notch, 8'5 ; breadth of alae in middle, 8 ; greatest 
