[ 45 ] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
arms and the distal half of the other arms. The diameters vary from 
8 mm to 24 mm externally; the apertures from 3.5 mm to 20 mm . 
One of the most perfect of these suckers (b) is preserved in alcohol, 
with the soft parts (Plate IX, figs. 5, 0), and was sent to me from Xew- 
foundland by Mr. Harvey. This has the greatest external diameter 
22 mm ; diameter of aperture, 10 mm ; height of. cup (outside), lG mm ; height 
at center, 15 mm ; height near inner margin, at attachment of pedicel, G mm ; 
length of pedicel, I4 mm ; diameter of pedicel, 1.5 mm . In a side-view the 
sucker is oblique and gibbous; the lower surface is convex centrally, but 
has a deep notch or pit near the front margin, in the bottom of which 
the slender but strong pedicel is attached, and the horny ring has a 
corresponding notch; the outer or back portion is much swollen and 
produced downward and backward, and here the horny ring is corre¬ 
spondingly high. The aperture is nearly circular, but is rather shorter 
from front to back than transversely. In this and some of the other 
suckers of similar size the entire circumference of the margin is fur¬ 
nished with rather large, sharp denticles, which are strongly inclined 
inward and considerably larger on the outer than on the inner margin. 
There are about thirteen of the large teeth, occupying rather more than 
half the circumference; these are broad at base, beveled off to an acute 
edge on the sides, and somewhat acuminate, with sharp tips. Those on 
the middle of the outer border point inward to the center of the sucker, 
but tho^e along the sides point rather obliquely to the front margin. 
The front margin is occupied by about seventeen smaller, unequal, 
acute denticles, those in its center the smallest and most regular; these 
are acute-triangular and their points are directed more upward than 
those of the opposite edge. The horny rings are light yellow (when 
dried they are white and osseous), their denticles yellowish white, and 
often silvery white and lustrous at tip and along their edges, especially 
when dried. The large suckers of this form 1 refer to the basal half of 
the lateral and dorsal arms. The suckers smaller than the above have 
fewer of the larger outer teeth, and usually fewer and less perfectly 
formed teeth along the front margin. Those that have the aperture 
7 min or less in diameter usually have the front margin of the ring only 
irregularly fissured, with the intervals minutely denticulate or crenulate, 
while the outer half of the margin may bear nine or ten large and well- 
developed denticles, with broad, stout bases and sharp edges and tips; 
the edges of these teeth along the middle are usually convex, and then 
the outline is incurved to the acute point. One of the smaller suckers 
examined has the aperture about 4.5' mn in diameter, with the same form 
as the larger ones; this has about six large, sharp denticles, like those 
above described, on the outer half of the margin of the rings, while the 
front margin is nearly entire and smooth. The smallest one ( j ) is simi¬ 
lar, with but four distinct large denticles, with another imperfect, lobe¬ 
like one on one side, and with a smooth front margin. These probably 
came from the distal half of the various arms. 
