208 A. BF. Verril—North American Cephalopods. 
the extreme end. Near the anterior end, between the principal 
cost and the margin, there are two additional cost, much less dis- 
tinct, and many faint radiating lines on each side. But these diverge 
more rapidly and mostly run into the margin at six to eight inches 
from the anterior end. The anterior portions and posterior portions 
are pale yellow or buff, fading to whitish at the thin margins, and 
deepening into pale amber at the midrib. Their substance is flexible, 
translucent, and very thin—-scarcely thicker than parchment, except 
at the midrib and cost. 
The third section evidently came from the middle region, where 
the shell was thickest and broadest. This piece is 7°50 inches long, 
and 4°10 broad, with a strongly convex midrib, 30 to °35 of an inch 
broad, running through the center, but without any lateral coste. 
In this portion the shell is much thicker and firmer than in the others, 
and of a decided brownish yellow, or dull amber-color, but quite 
translucent; it is finely striated with close, nearly parallel lines. 
The breadth and form of this middle portion must remain undeter- 
mined, for the present. The posterior section is quite incomplete, but 
is over ten inches long, and shows an extreme width of about six 
inches, or 5°75 where the lateral coste disappear. Some of the frag- 
ments extend backward eight inches or more beyond that point, and 
gradually fade out, both at the ends and lateral margins, into a 
white, soft but tough, fibrous membrane. So far as this portion is 
preserved, it indicates a broadly rounded and ill-defined posterior 
termination. 
To this species I refer, with some doubt, the tentacular-arm of No. 
2, preserved in the museum of St. John’s, Newfoundland. It agrees 
essentially in form and size, as will be seen from the description and 
measurements, with the corresponding arms of No. 5. Still it must 
be remembered that, as yet, no reliable distinctions have been made 
out between the tentacular-arms of A. Harveyi and A. princeps. 
The total length of the tentacular-arm of No. 2 was estimated at 
30 to 35 feet. The portion saved measured, when fresh, 579°12°™ (19 
feet). The circumference of the slender portion was 9 to 10™; of 
the enlarged sucker-bearing part, 15°24°" (6 inches); length of the 
part bearing suckers, 76°2°" (30 inches); diameter of the largest 
suckers, 3°17°™ (1°25 inches). Calculating from the photograph, the 
portion bearing the larger suckers was about 45°7°™ (18 inches) in 
length, and about 6°35°™ (2°5 inches) broad, across the face; distance 
between attachments of large suckers, 4:27°" (1°68 inches) ; outside 
diameter of larger suckers, 2°95 to 3°18°™ (1°16 to 1°25 inches) ; inside 
