248 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [38] 



Measurements of suckers of sessile arms (in inches). 



On first pair of arms, external diameter 



On first pair of arms, aperture diameter 



On second pair of arms, external diameter 

 On second pair of arms, aperture diameter 

 On third pair of arms, external diameter . . 

 On third pair of arms, aperture diameter. . 

 On fourth pair of arms, external diameter. 

 On fourth pair of arms, aperture diameter. 



.15 

 .08 



.14 

 .07 



Tentacular arms. — (Plate VI, fig. 2.) 



The tentacular arms are both entire, with all the suckers well pre- 

 served. The total length is 65 and 67 inches respectively; length of the 

 expanded portion or club, 8.25 inches ; diameter of the peduncular por- 

 tion varies from .40 to .70 of an inch ; at the base, .90 inch ; breadth of 

 the proximal part of the club, where it is broadest, .70 inch ; diameter, 

 from front to back, 60 inch ; external diameter of the largest suckers, .35 

 inch ; height of their cups, .28 inch ; of lateral suckers, .18 inch ; of the 

 largest marginal suckers on the distal portion, .14 inch. 



The peduncular portion is somewhat thickened and rounded at the 

 base, but through most of its length it is slender, varying in size, and 

 nearly triangular in section, with the corners rounded, each side meas- 

 uring, where largest, .60 of an inch in breadth. At about a foot from 

 the base the small smooth-rimmed suckers and their opposing tubercles 

 begin to appear on the inner surface. At first these are placed singly 

 and at considerable intervals (2.5 to 3.5 inches), each sucker alternating 

 with a tubercle on each arm ; farther out they are nearer together, and 

 toward the club they alternate, two by two, on each arm; near the 

 commencement of the club they become more numerous, and are ar- 

 ranged somewhat in two rows; just at the commencement of the club 

 they become more crowded, forming three and then four oblique trans- 

 verse rows of suckers, with the same number of tubercles alongside of 

 them ; on the basal expansion of the club, which is its thickest portion, 

 these suckers and tubercles become very numerous, covering nearly the 

 whole inner surface, forming rather crowded and irregular oblique rows 

 of six or more. These smooth-rimmed suckers are followed by an irreg- 

 ular group of about twenty, somewhat larger, denticulated suckers, oc- 

 cupying the entire breadth for a very short distance. Then follow the 

 two median rows of large suckers, alternating with a row of marginal 

 ones, of about half their size, on each side. The first three or four 

 large suckers of each row gradually increase in size ; then follow six to 

 eight nearly equal ones of the largest size ; these are followed by two to 

 four distal ones, decreasing in size. In one of the rows there are four- 

 teen that distinctly belong to the large series ; in the other row there 

 are twelve. The distal section of the club is occupied by four regular 



