274 
A. E. Verrill — North American Cephalopods. 
actual projection anteriorly is but slight, because the translucent 
edge- beyond it rises to about the same level. The lateral-posterior 
borders of the frontal lamina; are sinuous and incurved in the middle ; 
the palatine lamina is broad, with the posterior lateral edges incurved 
and sinuous. 
The lower mandible has the extreme tip strongly incurved, forming 
a slight notch, close to the tip, below which the edges are slightly 
incurved or nearly straight, with a decided V-shaped notch at the 
base ; the anterior edges, beyond the notch, form a triangular tooth 
of the inner laminae, but this is obscured, unless viewed by trans- 
mitted light, by the outer alar laminae, which rises at its anterior 
edge, which is translucent, nearly to a level with the tooth ; the 
inner ends of the alae are wider than the middle, and broadly rounded ; 
the gular laminae are short, narrowed posteriorly, with their inner 
edges incurved, and with a thickened, prominent ventral carina. 
The jaws of a large specimen measure as follows: upper mandible, 
tip to posterior end of palatine lamina, 22'“'“; to dorsal end of frontal 
lamina, 16; to posterior lateral edge of same, 9; to base of cutting 
edge, 5 ; inner edge of palatine lamina to dorsal end of frontal 
lamina, 17. Lower mandible, tip to inner end of aim, 13 n,,n ; to ven- 
tral notch of ala, 4 ; to ventral notch of gular lamina, 9 ; to posterior 
end of same, 16 ; to base of cutting edges, 5. 
The buccal mass has, on the outer surface of the dorsal and lateral 
sides, a broad, thin, brown horny plate, with a notch posteriorly, in 
the median line. 
The odontophore (Plate XXXVII, tig. 8), is remarkable for the 
length and Sharpness of the teeth, especially of the central and outer 
rows. The median teeth have a long and very acute median denticle, 
with much shorter latei*al ones. The inner lateral teeth have broad 
bases and a long and very sharp central denticle, with a much shorter 
lateral one, on the outside. The next to the outer lateral teeth are 
simple, slender and sharp. The outer lateral teeth are much longer, 
strongly curved, and very acute. 
The pen (Plate XXVIII, fig. 4) is long and slender, with a slender 
midrib and strong marginal ribs ; the anterior end is thin, broad pen- 
shaped, subacute ; from very near the anterior end it tapers gradu- 
ally backward to about the posterior fourth, where it becomes very 
narrow, apparently consisting only of the consolidated lateral ribs 
and midrib, the former showing on the ventral side a thin groove 
between them, the latter appearing as a slender ridge on the dorsal 
side. The posterior portion is naiTow-lanceolate in form, with thin 
