[ 207 ] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
brane has seven distinct angles. Arms rather long and strong; trape¬ 
zoidal in section. The dorsal arms are considerably shorter than the 
others; order of length is 1, 2, 4, 3; the third is but little longer than 
the second pair; ventral arms decidedly more slender than the others. 
Ventral arms with four rows of denticulated suckers (Plate XLV, fig. 
lc), those of the two inner rows larger; lateral and dorsal arms with 
two marginal rows of small suckers and two inner rows of larger in¬ 
curved hooks, inclosed, except at the sharp tips, in muscular sheaths, 
which have lateral basal expansions and short pedicels. (Plate XLV, 
fig. 1&.) Tentacular arms* long and strong, quadrangular; in my spec¬ 
imen they reach back beyond the base of the fin; the club is large and 
broad, with a long, narrow distal portion, having a strong dorsal keel; 
in the middle are two very large, curved hooks (figs. 1, la), the distal 
one smaller; proximal to these there is a row of five smaller hooks, de¬ 
creasing proximally, and between these and the large hooks there is, on 
one arm, a single small sucker, on the other arm a single sucker takes * 
the place of the proximal hook, while an odd, small sucker stands to 
one side of the row; along the upper margin of the club there is a broad 
band of small, denticulated suckers, on long pedicels, arranged in oblique, 
transverse rows of five or six; this band of suckers is interrupted oppo¬ 
site the large hooks; beyond the hooks a large group of similar small 
suckers covers nearly the whole distal portion of the club (Plate XLV, 
fig. 1); at the tip of the club there is a circle of small smooth suckers; 
along the lower margin of the middle portion of the club there is a band 
of small suckers, like those on the other margin; along the basal third 
of the margin and supported on a thickened marginal expansion of the 
club, there is a row of six special, smooth, connective suckers, at the 
inner ends of transverse, muscular ridges (fig. le); between and alter¬ 
nating with these suckers, there are deep pits and as many small, round 
tubercles, destined to fit the suckers and ridges of the other club; con¬ 
tinuous with these a row of similar, but smaller, sessile, connective 
suckers and tubercles extends down along the margin of the inner face 
of the arm, for about half its length, becoming smaller and more simple 
proximally ; an irregular band, formed of two or three rows of small, 
pediceled and denticulated suckers, extends down the other margin of 
the arm, with some scattered ones along the middle. 
The pen (Plate XLV, fig. Id) is thin, long and narrow ; anterior part 
about half as wide as the middle portion, slender, concave, with thick¬ 
ened margins; the anterior end is very thin, acute; the two marginal 
ribs converge gradually, as they run backward, and unite near the pos¬ 
terior end; the widest part of the pen is a little behind the middle; the 
thin margins begin at about the anterior third, gradually increasing in 
*The figure given (Plate XV, fig. 3) of the somewhat injured tentacular club of 
the type of Cheloteutliis rapax represents the structure nearly correctly, hut many of the 
small suckers and tubercles on the arm, below the club, had been destroyed, the edge 
above e 1 is injured, and of the large hooks (a, a') only the sheaths remain. 
