216 A, E. Verrill—North American Cephalopods. 
Measurements of suckers of short arms (millimeters). 
a. | 6.) eC. | a. |) Ser eee geen ene 
Transverse diameter, outside, 24.) 21 | 20 | 20 | 17) 16 16) | LONSosoaies 
Diameter of aperture, inside, 20] 10°5| 9 9} 8:5) 8 7 5| 4:5) 3°5 
Breadthiof horny ring, back Side, 7) VO!)/52 22] 0 5), Dea Si SIa eae) TT eee 5 
# cc # front side,| 5/-.-.| 3°5) 3 | 3 275) 3a aaa 15 
Number of large denticles, PAM Wl sie NENA S| WA ||) |) abe aK) YON |) 
Number of small denticles, 22,17 [10 | 22402" |b ee ee 
The long tentacular-arms agree very closely with those of A. 
Harveyi (No. 5) in form and in the arrangement of the suckers on 
the ‘club.’ When fresh they measured 914:4°" (30 feet) in length 
with a circumference of about 12°7°™ (5 inches), except at the enlarged 
club, which was 20°32" (8 inches) in the middle. But when first 
examined by me they had shrunk to 731°5™ (24 feet) in length, and 
the circumference of the slender portion was 9 to 10°; that of the 
club was 15°24 (6 inches). At that time the ‘club’ was 77°47™ 
(30°5 inches) long; that portion bearing the larger suckers was 
48:26" (19 inches); the wrist or portion bearing the smaller and 
partly smooth-rimmed suckers and tubercles was 15°24™ (6 inches) 
long; the terminal portion, bearing small denticulated suckers was 
22°86" (9 inches) ; the breadth of the front of the club was 7°62™ 
(3 inches). The terminal portion had a strong carina-like membrane 
or crest along the back, and was here 5°” (2 inches) wide, from front 
to back. 
The large suckers (Plate XVII, figs. 1, 1a) of the tentacular-arms 
are nearly circular in outline, and are broad, depressed, little ob- 
lique, constricted just below the upper margin, and then swelled 
out below the constriction to the base. The calcareous ring is 
strong, white, and so ossified as to be somewhat rigid and bone-like. 
The margin is surrounded by numerous (about 45 to 50) nearly equal, 
acute-triangular teeth, sometimes separated by spaces equal to their 
breadth, at other times nearly in contact at their bases; their edges 
are so bevelled as to be sharp; while there is a triangular thickening 
in the middle of each, at base. A wide, deep and concave groove 
extends entirely around the rim a short distance below the margin ; 
below this the lower part of the rim is somewhat expanded and 
irregularly plicated, varying in width. The largest ring studied by 
me measures 31™™" in its greatest diameter externally; the aperture 
is 26™" and 23™™ across its longer and shorter diameters ;* greatest 
* This specimen is somewhat warped, by drying, so that the aperture is not so 
circular as when fresh. 
a 
