[ 119 ] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
Chiroteuthis Bonplandi D T Orl>. (?). 
Loligopsis Bonplandi Verany, Acad. Turin, ser. ii, vol. i, pi. 5 (specimen with¬ 
out tentacular arms, t. D’Orb.). 
Chiroteuthis Bonplandi D’Orbigny, Cdphal. Ac<5tab., p. 226 (description com¬ 
piled from Verany). 
Verrill, Bulletin Mus. Comp. Zool., vol. viii, p. 102, pL 3, figs. 1-1 1), 1SS1; 
Trans. Conn. Acad., vol. v, p. 299, pi. 47, figs. 1-1 b. 
Plate XXXII, figures 1-1 c. 
A detached, tentacular arm belonging to a species of Chiroteuthis was 
taken by the United States Coast Survey steamer “Blake,” in the sum¬ 
mer of 1880, at station ccciii, lat. 41° 34' 30", long. 65° 54' 30", in 306 
fathoms. 
The arm is very long and slender, the length being 7S0 rnm (or over 30 
inches), its diameter being from 1.5 rnm to 2 rnrn , except near the base, where 
it is 3 mra , and at the terminal club, which is 6®"* broad and 54 mm long. 
The arm is white, with purplish specks, and is generally roundish, ex¬ 
cept at the club; along the greater part of its length there is a row of 
rather distant sesSile suckers, the distance between them being usually 
from 12 mm to 18 mm ; these suckers are larger than those of the club, and 
have a nearly flat upper surface and no horny marginal rim is preserved. 
A row of small, simple, scattered pits, perhaps homologues of these 
suckers, extends up the back side of the club. These smooth suckers evi¬ 
dently serve to unite the tentacular arms together when used in concert. 
The club is much stouter than the rest of the arm, convex on both sides, 
and but little flattened; on each side it is bordered by a well-developed 
scalloped marginal membrane, supported by a series of transverse, thick¬ 
ened, but flat, tapering, acute, muscular processes, with their ends pro¬ 
longed beyond the edge of the intermediate membrane, producing a 
deeply-scalloped border; on the distal half of the club these muscular 
supports are separated by spaces greater than their breadth, but on the 
proximal portion they subdivide into two or three parts, which become 
crowded close together, showing only narrow intervals or merely a groove 
between them. At the tip of the arm there is a thick, ovate, dark pur¬ 
ple, spoon-shaped, hollow organ, about 4 mm long, with its opening on the 
back side of the arm. This so strongly resembles the spoon-shaped organ 
of the hectocotylized arm of some Octopods as to suggest the possibil¬ 
ity of a similar use for sexual purposes. The suckers are crowded in 
four or more indistinct rows. Their pedicels are long and slender, hav¬ 
ing beyond the middle a large, dark purple, fluted, swollen portion or 
bulb, beyond which the pedicel is more slender; the cup of the sucker 
is small and lateral, with a very oblique, oblong, horny rim, which is not 
distinctly toothed (fig. 1 i); but its extreme outer edge is sometimes 
slightly beaked and much thickened. 
The fleshy border of the suckers is covered with small angular and 
irregular scales (fig. 1 c ) ; its edge is tinged with purple. 
This tentacular arm is referred to C. Bonplandi only provisionally, for 
