[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 Fish Commission, in the trawl-net, 30 miles 
east from Cape Ann, Mass., in 110 fathoms, August, 1878. Two large 
specimens were taken 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 case, associated with 
Octopus Bairdit and Rossia sublevis. 
a Specimens, 
3 Locality. Fath. Spon cones: Received from— a mber 
$ : and sex. 
n 
194 | Gulf of Maine........ 110 | Aug. 31, 1878 | United States Fish Commission. ..-.. 3 j. 
303 | Off Cape Cod ..-...-.--. 122 | Aug. 21, 1879 |.....- MO eesanencee eee casein <<a are 1c 
oh een SF SRE ROT 94 | Sept. 10, 1879 |....-. dajets cebh iat. ip TOPS <A 11. 2 
947 | Off Martha’s Vineyard| 312 | Aug. 9, 1881]....-- GO esmonsrodciscesne tens seccuiee 11. 9; Tj. 
earl Batince Ores seb. telat 388 Aug. 24, 18815 -- =. OObiseee's papas see aueee= eceen ih 
ORT raarcts = CO scsae snes 302 SBE Spee le eet GO eseciecwae Secs ee teesnessccsae UL Bios pa 
eae sn Gi) Scgnecis otnoace 2600 teee OOlmer eer |-- ete GG) Botqdnidde Sac mnec aa concent ase 19 
AO2GN | Sess = dO 22 eta sasen se 182 dOpecsseelcrsee Gee ee aesstaspeceethcasesntes shy Sub 
ROSSIA Owen. 
Rossia Owen, Trans. Zool. Soc., London, 1828 (t. Gray). 
Owen, in J. Ross, Second Arctic Voyage, Appendix, p. xcii, pl. 100, 1835. 
D’Orbigny, Céphal. Acétab., 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 ieee connective cartilage having 
three ridges, fitting into three grooves, which form an ovate or horse- 
shoe-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 Verrill.—(Hyatt’s bob-tailed squid. ) 
Verrill, Amer. Journ. Sci., vol. xvi, p. 208, 1878. 
Tryon, Man. Conch., i, p. 160, 1879. (Description compiled from preceding. ) 
Verrill, Amer. Jour. Sci., xix, p. 291, pl. 15, figs. 1 and 2, April, 1880; Trans. 
Conn. Acad.,v., p. 351, pl. 27, figs. 8,9; pl. 30, fig. 1; pl.31, figs.1,2; pl. 46, 
fig. 5, 1881. 
Plate XXXV, figures 2, 5,6. Plate XXXVI, figures 3-6. Plate XXXVII, figure 1, 
Body subcylindrical, usually broader posteriorly; in preserved speci- 
mens variable in form according to contraction. Dorsal surface coy- 
