REPORT OF COMMISSIONER OF FISH AND FISHERIES [26] 
They are, except the ventral, compressed trapezoidal in form, and 
taper very gradually to slender, acute tips; their inner faces, along the 
proximal half of their length, are occupied by two alternating rows of 
large, obliquely campanulate suckers, with contracted apertures, sur- 
rounded by broad, oblique, thin, horny, marginal rings, much broader 
on the outer side than on the inner, and armed with strong, acute teeth 
around their entire circumference, but the teeth are largest and most 
oblique on the outside (Plate IV, figs. 5-8). The suckers gradually 
diminish in size to the tips of the arms, where they become very small; 
those toward the tips of the arms appear to have been denticulate on 
the outer side, and entire, or nearly so, on the inner margin. The ven- 
tral arms still have, as they show in the photograph, the inner face 
much broader than it is in the others, especially neat the base, and 
they are more nearly square than any of the others: Their suckers are 
more numerous, farther apart transversely, and closer together in the 
longitudinal series, there being about 46 on the proximal half (36 inches) 
of each, while on each of the subventral arms there are only about 30 on 
the corresponding portion; the suckers also diminish rather abruptly in 
size at about 26 to 30 inches from the base, beyond which they are 
scarcely more than half as large as those on the second and third pairs 
of arms, at the same distance from the base; it is probable, judging 
from the small specimen (No. 24), that all the suckers of the ventral 
arms were denticulate only on the outer margin. The largest of these 
suckers are said by Mr. Harvey to have been about an inch in diam- 
eter when fresh. The largest of their marginal rings in my possession 
are 16™ to 17™" in diameter at the serrated edge, and 18™™ to 21™ be- 
neath. . 
The horny rings are yellowish horn-color, oblique, and more than twice 
as high on the back side as in front. A wide peripheral groove runs 
entirely around the circumference, just below the denticulated margin; 
it is narrower and deeper on the inner side. On the inner side of the 
largest kind (e, d, e, g) the edge is nearly vertical, and the denticles point 
upward or are but slightly incurved; but on the outer side the edge and 
denticles are bent obliquely inward; along the lateral sides the edge is 
more or less incurved, and the denticles are inclined more or less forward, 
toward the inner edge of the sucker (figs. 5, 6, 6a). The denticlesare golden 
yellow, or when dry silvery white; those on the outer and lateral mar- 
gins are largest, flat, lanceolate, with sharply beveled lateral edges and 
acuminate tips; those on the front margin are shorter, narrower, acutely 
triangular, and in contact at their bases. On the largest of these suckers . 
there are forty-eight to fifty denticles. Some of the suckers (figs. 7, 7a, 8) 
of rather smaller size (a, b) are more oblique, with the outer side of the 
7.5 inches in circumference, and one of the lateral ones (perhaps one of the third pair) 
Sinches. The marginal membranes and crests had decayed, apparently, before the 
arms were preserved. The terminal portions of the arms are also gone, so that theirreal 
length cannot be given. ; 
