,4. E. VerriH — Earth American Cephalopods. 
311 
the center of the club there are two alternating rows of large, broad, 
depressed suckers, about seven in each, with a few smaller ones, of 
the same series, at both ends ; along each edge, alternating with the 
large suckers, there is a row of smaller and more oblique marginal 
suckers, about half as large. The proximal part of the club bears 
only a few small denticulated suckers ; the distal part bears a large 
number of small, sharply denticulated, pedicelled suckers, crowdedly 
arranged in four rows ; close to the tips of the arms about twenty of 
the small suckers have smooth rims and very short pedicels, but are 
still in four rows. The large suckers vary greatly in relative size, 
according to age, sex, season, and locality ; they are a little higher 
on one side than on the other, with a broad aperture, surrounded by 
a horny, marginal ring, which is divided all around into sharp, un- 
equal teeth, which are larger on the outer side (PI. XL, fig. 5) ; 
usually one minute, sharp tooth stands between two larger ones, and 
these sets of three stand between still larger and less acute ones ; 
the horny ring is surrounded by a wide, thick, soft, marginal mem- 
brane ; below the border, a groove surrounds the sucker, and below 
this there is a basal swelling, equalling or exceeding the margin in 
diameter. The smaller marginal suckers (PI. XL, fig. 4a, 4&) have 
the aperture more oblique and the horny ring much wider on the 
outer side, with its outer, sharp, marginal teeth longer and more 
incurved ; usually these have the teeth alternately larger and smaller. 
The outer buccal membrane (Plate XXIX, fig. 4) is large, thin, with 
seven prominent, elongated, acute angles, all of which have a cluster 
of about ten to fifteen, small, pedicelled suckers, in two rows, on the 
inner surface (a, b, c, d). These suckers have horny rings, denticu- 
lated on one side. In the female there is a special thickened organ 
( s ) in the form of a horse-shoe, on the inner ventral surface of the 
buccal membrane. This in the breeding season serves for the attach- 
ment of the spermatophores by the male. 
The muscular pharynx (fig. 4, e,f) containing the jaws can be pro- 
truded its whole length. The inner buccal membrane (/’) or sheath 
enclosing the beak (m), has a prominent, thickened, radially-wrinkled 
and puckered anterior margin. On the ventral side the pharynx 
bears, externally, two thin chitinous plates, not connected with the 
jaws. The points and exposed edges of the beak are hard and black, 
becoming dark reddish brown farther back; the alje, gular and pala- 
tine lamiiue are thin and pale yellowish or light amber-color, in alco- 
holic specimens. The upper mandible (PI. XXXI V, figs. 4, 4a, var. 
pallida) has a sharp, strongly-incurved point; cutting edge regularly 
