A. E. Terrill — North American Cephalopods. 263 
Young Architeuthis Harveyi. Measurements of arms (in inches). 
Near 
base. 
At 
5 in. 
At 
10 in. 
At 
15 in. 
At 
20 in. 
Dorsal pair. 
Breadth of front, excluding membranes, _ 
_g 
•35 
•50 
•30 
•20 
•30 
•20 
•60 
•40 
Diameter from front to back. . 
1-oib 
•90 
■70 
Second pair. 
Total length 
26-25 
•40 
•50 
■35 
•99 
•18 
Breadth or membranes, — 
■25 
•30 
*15 
•80 
•65 
•35 
•30 
•16 
Diameter, front to back, 
1-20 
1-20 
•85 
•60 
•40 
Third pair. 
Breadth of front — - - 
•50 
*50 
•40 
Breadth of membranes, .. 
•20 
•25 
•15 
Diameter, transversely. . . 
1-10 
•70 
•40 
Diameter, front to back, . . 
1-08 
1-60 
1-20 
Fourth pair. 
Breadth of front, 
•40 
•oo" 
•30 
Breadth of membranes. _ . 
•20 
•25 
•10 
__ 
Diameter, transversely. — 
•98 
•90 
Diameter, front to back, . . . _ 
1-40 
1-12 
Tentacular- arms . 
Total length, ._ 
67- 
Base to expansion of club . 
58'75 
Diameter of slender portion, .. 
•4--6 
Length of club 
8-25 
Length of part occupied bv 24 largest suckers,. 
4-25 
Length of part occupied by small distal suckers, . 
2 60 
Greatest breadth of club, . . 
•70 
Diameter, front to back, 
•60 
Sessile arms, from base to particular suckers. 
To 
25th. 
To 
50th. 
To 
100th. 
To 
150th. 
To 
200th. 
To 
250th. 
To 
300th. 
To 
tip. 
Dorsal pair, base to suckers. 
12-25 
Second pair, base to suckers, 
7*75 
12-25 
1 6’75 
20-25 
22-90 
2450 
25-75 
26-25 
Third pair, base to suckers, 
Fourth pair, base to suckers, 
7*25 
6*25 
12-25 
10- 
16-50 
20-75 
-- 
Measurments of suckers of sessile arms (in inches). 
1 
O 
CO 
50th. j 
100th. j 
On 1st pair of arms, external diameter, 
•31 
•24 
•16 .. 
On 1st pair of arms, aperture diameter 
•25 
•15 
•10 .. 
On 2d pair of arms, external diameter, 
•31 
•27 
•20 -15 
On 2d pair of arms, aperture diameter. 
•25 
•18 
•11 08 
On 3d pair of arms, external diameter 
•31 
•28 
•22 
On 3d pair of arms, aperture diameter, 
•22 
•18 
•i2 
On 4th pair of arms, external diameter 
•25 
•21 
•16 , -14 
On 4th pair of arms, aperture diameter, 
•15 
11 
•10 j 07 
