236 A. E. Verrill — JVbrth American Cephalopods. 



ill diameter; their apetures 2'""'; length of pedicels 4 to 5""". The 

 largest suckers on the ventral arms are not so large as those on the 

 others ; the largest are 4""" in diameter. Only a few suckers (6 

 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 ala? 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 aUe 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, 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""" ; 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 alge (union with palatine), 7*5 ; beak to posterior lateral 

 border of ala), 13-5; transverse breadth across outer side of alse, 

 '9-5. Lower mandible, length, 23'""' ; inner ends of al?p to mentum, 

 225 ; tip of beak to dorsal border of gular lamina, 17 ; to inner ends 

 of alffi, 18 ; to notch, 8-5 ; breadth of ahe in middle, 8 ; greatest 



