MUSEUM OF COMPARATIVE ZOOLOGY. 113 
length of the arms decreasing from the dorsal to the ventral ones ; suckers ses- 
sile, simple, in two rows; mantle united firmly to the head by a ventral and 
two lateral muscular commissures, the former placed in the median line, at the 
base of the siphon ; free end of the siphon short, well forward. 
In the male the right arm of the third pair is hectocotylized, and developed 
in a sac in front of the right eye (Pl. VIII. figs. 1, 1,4); as found in the sac, it 
is curled up, and has two rows of suckers ; the groove along its edge is fringed ; 
near the end the groove connects with a rounded, obliquely placed, broad, 
flat or slightly concave lateral lobe, with transverse wrinkles or plications on 
the inner surface ; the terminal portion of the arm is a long-fusiform smooth 
process, 
The permanent attachment of the mantle to the siphon, by means of com- 
missures, is a very distinctive character. 
Alloposus mollis VERRILL. 
Amer. Jour. Sci., XX. p. 394, Nov. 1880 ; Proc. Nat. Mus., III. p. 363, 1880 ; Trans. 
Conn. Acad., V., Pl. L. figs. 1, La, 2, 20; Pl. LI. fig. 4. 
Plate IV. Fig.4. Plate VIII. Figs. 1, 1», 2, 2*. 
Jody stout, ovate, very soft and flabby. Head large, as broad as the body; 
eyes large, their openings small. Arms rather stout, not very long, webbed 
nearly to the ends, the dorsal much longer than the ventral arms ; suckers 
large, simple, in two alternating rows. Color deep purplish brown, with a 
more or less distinetly spotted appearance. Total length of a medium-sized 
specimen, 160mm. ; of body, to base of arms, 90 mm. ; of mantle beneath, 
50 mm. ; of dorsal arms, 70 mm. ; breadth of body, 70 mm. Other specimens 
are about one third larger. The sexes scarcely differ in size. 
One mature, detached, hectocotylized arm (Pl. IV. fig. 4) was taken, No- 
vember 16. This has two rows of large six- or seven-lobed suckers, a very 
long fringe composed of thin flat lacerate processes along each side; the 
terminal process is fusiform, acute, and loosely covered with a thin, trans- 
lucent membrane, beneath which the inner surface, bearing chromatophores, 
can be seen. Length of this arm, 200 mm. ; its breadth, 20 mm. ; length of 
terminal process, 30 mm. ; its diameter, 7 mm. ; diameter of largest suckers, 
6 mm. ; length of fringe, 15 mm. 
Taken by the *Fish Hawk," at Stations 880, 892, 893, 895, about 100 
to 115 miles south of Newport, R. I., in 225 to 487 fathoms. «Also off the 
mouth of Chesapeake Bay, at station 898, Nov. 16, in 300 fathoms. 
Argonauta argo Linné 
Shells of this species, some of them entire, were taken by the “Fish Hawk” 
at several of the stations 70 to 115 miles south of Martha's Vineyard and New- 
port, R. L, in 64 to 365 fathoms, At least eight specimens were dredged. 
VOL, VIT — NO, D. 8 
