A. E. Verritt — North American Cepkalopods. 
349 
This species is an exceedingly beautiful one, when living, owing to 
the elegance and brilliancy of its colors and the gracefulness of its 
movements. In swimming it moves its fins in a manner analogous to 
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 U. S. Fish Com., in the trawl-net, 30 miles east from 
Cape Ann, Mass., in 110 fathoms, August, 1878. One larger male 
was taken by us off Cape Cod in 122 fathoms, with the bottom tem- 
perature 41° F., August, 1879. The largest specimen seen was a 
male, taken in the same region, Sept. 10, 1879, in 94 fathoms. It was 
associated with Octopus Bairdii and Bossia sublems. 
Station. 
Locality. 
Fath. 
When Collected. 
Received from 
Specimens. 
No. Sex. 
194 
Gulf of Maine 
110 
Aug. 31, 
1878 
U. S. F. Com. 
3j. 
303 
Off Cape Cod 
122 
Aug;. 21. 
1879 
U. S. F. Com. 
1 
8 
342 
Off Cape Cod 
94 
Sept. 10, 
1879 
U. S. F. Com. 
1 1 . 
8 
ROSSIA Owen. 
Rossia Owen, Trans. Zool. Soc. London, 1828 (t. Gray) ; Owen, in J. Ross, Second 
Arctic Voyage, Appendix, p. xcii, pi. 100, 1835. 
D’Orbigny, Cephal. Aeetab., p. 242. 
Gray, Catal. Moll. Brit. Mus., i, p. 88, 1849. 
Mantle-edge free from the head dorsally, adhering by a longitudi- 
nal, ovate or horse-shoe-shaped connective cartilage, having a median 
and two lateral grooves, fitting into corresponding grooves on the 
cartilage of the mantle ; two lateral, oblong, ridge-like cartilages, one 
on each side, also fit into ovate cartilage-pits on the base of the 
siphon. No olfactory crests. Pupils oblong or crescent-shaped, lon- 
gitudinal. A false eye-lid below the eye. A pore in front of each 
eye, and one, on each side, between the bases of the third and fourth 
pairs of arms. Tentacular arms more or less retractile into large 
cavities at their bases, extending back beneath tin* eyes; club well 
developed, with numerous, nearly equal suckers, forming eight or 
more rows ; rims not toothed ; borders scaled. Buccal membrane 
with only six lobes, without suckers. The males differ from the 
females in having larger suckers on the middle of the lateral arms. 
Rossia megaptera, up. nov. 
Plate XXXVIII, figure 1 Plate XLVI, figure G. 
Body short, broad, depressed, covered wit h a soft, flabby integument, 
