[ 31 ] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
cmnscribing a more flattened area, on which are grooves and ridges 
parallel with the notch. Beyond the notch, on the anterior edges of 
the alee, there is, on each side, a broad, low, obtuse lobe or tooth, be¬ 
yond which the edge is even and slightly concave to near the end of 
the aloe. The lamina of the lnentum is short and strongly emarginate 
in the median line. Detailed measurements of the parts are given in 
the table of measurements on a subsequent page. 
The roof of the mouth, or palate, between the anterior portions of the 
palatine laminae, is lined with a rather firm, somewhat chitinous or 
parcliment-like membrane, liaviug its surface covered with strong, acute, 
recurved, yellowish teeth, apparently chitinous in nature, attached by 
broad, oval, or roundish flattened bases (Plate V, figs. 4, 5). These 
teeth are mostly curved, and very unequal in size and form, the various 
sizes being intermingled. They are arranged in irregular quincunx, in 
many indefinite rows. Many irregular, roundish, rough, white, stony 
granules are also attached to this membrane, among the teeth. Similar 
granules (Plate V, fig. 4 a) occur in large numbers on the thinner exten¬ 
sion of this membrane, which everywhere lines the mouth and pharynx. 
The radula is about G4 mm in total length, with the dentigerous por¬ 
tion, where widest, about ll mm in width. The teeth are in seven 
rows, with an exterior row of small, unarmed, thin, rhomboidal plates 
on each side, thus conforming to the arrangement in the other ten-armed 
Cephalopods. The teeth are deep amber-color to dark brown, and not 
unlike those of Loligo and Ommastrephcs in form. Those of the median 
row have three fangs, the central one longest; those in the next row, 
on either side, have two fangs, while those of the two outer lateral rows, 
on each side, are acute and strongly curved; the outermost longest and 
simple, the next to the outer often having a small denticle on the outer 
side, near the base. (See Plate Y, figs. 1, 2, 3.) 
The membrane of the odontophore is broad, firm, and thick; the 
dentigerous portion occupies only about a third of its width, in the 
middle or broader portion, where it is bent abruptly back upon itself. 
The lower or ventral portion measures, from the anterior bend to the 
end, 20 mm ; it narrows gradually to the broad, obtuse end, the width of 
the dentigerous portion decreasing from 9 mm to 5 mm , the naked lateral 
membrane decreasing from 8 mm to a very narrow border. The upper 
pqrtion, from the bend to the end, measures 42 mm in length (in a straight 
line). The upper surface is deeply concave and infolded, at first, with 
the lateral membrane broad and recurved; farther back it becomes 
more flattened, with the dentigerous portion broader (ll mm ), while the 
lateral membrane is abruptly narrowed and then extends to the end as 
a very narrow border. Toward the end the rows of teeth become more 
separated and the teeth smaller and paler, while the membrane becomes 
thinner and narrower. 
The internal shell, or pen, was represented by numerous detached 
pieces, which, after much trouble, I succeeded in locating and match- 
