[ 167 ] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 
the motion of the wings of a butterfly. This fact, and its bright colors, 
suggested the English name that I have applied to it. 
Three specimens, two very young, were taken by the writer and 
party, of the United States Eish Commission, in the trawl net, 30 miles 
east from Cape Anu, Mass., in 110 fathoms, August, 1878. Two large 
specimens were takeu by us off Cape Cod in 94 and 122 fathoms, with 
the bottom temperature 41° F., August and September, 1879. Recently 
we have taken it in deeper water (182-388 fathoms) about 100 miles 
south of Martha’s Vineyard. It was, in each casp, associated with 
Octopus Bairdii and Rossia sublevis. 
j Station. 
Locality. 
Fatli. 
When collec¬ 
ted. 
Received from— 
Specimens, 
number 
and sex. 
194 
110 
Aug. 31,1878 
Aug. 21,1879 
Sept. 10,1879 
Aug. 9, 1881 
Aug. 24,1881 
Sept. 8, 1881 
3 j. 
1 d 
11. ? 
if 9; lj. 
11. 9 
11. d ; 11 . 9 
i 9 
3 i. 
303 
122 
342 
94 
947 
Off Martha’s Vineyard 
312 
952 
388 
998 
302 
999 
266 
1026 
.do. 
182 
ROSSIA Owen. 
Rossia Owen, Trans. ZoqI. Soc., London, 1828 (t. Gray). 
Owen, in J. Ross, Second Arctic Voyage, Appendix, p. xcii, pi. 100,1835. 
D’Orbigny, C6phal. Ac6tab., p. 242. 
Gray, Catal. Moll. Brit. Mus., i, p. 88,1849. 
Mantle-edge free from the head, dorsally, with a small median angle, 
it adheres to the head by a longitudinal connective cartilage having 
three ridges, fitting into three grooves, which form an ovate or horse- 
slioe-shaped cartilage on the back of the head; two elongated, simple, 
cartilaginous ridges, one on each side, also fit into ovate pits on the 
base of the siphon. A free eyelid is developed beneath the eye. Pupils 
indented, above. An aquiferous pore, on each side, between the third 
and fourth pairs of arms. No olfactory crests. Tentacular arms more 
or less retractile into cavities below the eyes; club well-developed, usu¬ 
ally with numerous, nearly equal, minute suckers, in about eight rows; 
rims not toothed; borders scaled. 
The males differ from the females in having larger suckers on the mid¬ 
dle of the lateral arms; both dorsal arms are slightly hectocotylized. 
Rossia Hyatti Veri-ill.—(Hyatt’s bob-tailed squid.) 
Verrill, Amer. Journ. Sci., vol. xvi, p. 208, 1878. 
Tryou, Man. Conch., i, p. 160, 1879. (Description compiled from preceding.) 
Verrill, Amer.TJour. Sci., xix, p. 291, pi. 15, figs. 1 and 2, April, 1880; Trans. 
Conn. Acad.,v., p. 351, pi. 27, figs. 8,9; pi. 30, fig. 1; pi. 31, figs. 1,2; pi. 46, 
fig. 5,1881. 
Plate XXXV, figures 2, 5, 6. Plate XXXVI, figure 3-6. Plate XXXVII, figure 1. 
Body subcylindrical, usually broader posteriorly; in preserved speci¬ 
mens variable in form according to contraction. Dorsal surface cov- 
