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 (PI. VIII. figs. 1, 1, o) ; 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, oblic^uely placed, broad, 

 flat or slightly concave lateral lobe, with transverse wrinkles or plications on 

 the inner surface ; the terminal portion of the aim is a long-fusifonn 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. ScL, XX. p. 394, Kov. 1880 ; Proc. Nat. Mus.,III. p. 363, 1880 ; Trans. 

 Conn. Acad., V., PI. L. figs. 1, 1 rt, 2, 2a ; PI. LI. fig. 4. 



Plate IV. Fig. 4. Plate TIU. Figs. 1, Is 2, 3». 



Body 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 distinctly spotted appearance. Total length of a medium-sized 

 specimen, 160 mm. ; 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 tw'o 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 lOO] 

 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 Linne 



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 Martlia's Vineyard and New- 

 port, R. I., in 04 to 365 fathoms. At least eight specimens were dredged. 



VOL. VIII. — NO. .f). 8 



