350 
A. E. Verrill — North American Cephalopoda. 
which forms a loose border posteriorly ; the front edge of the mantle 
extends forward dorsally into a prominent angle, but recedes very 
much ventrally. Fins very large and broad ; their anterior insertions 
being but little back of the antero-lateral edge of the mantle, and 
their posterior insertions close to the end of the body ; the free bor- 
ders of the fins are thin and undulated, extending forward anteriorly 
beyond the edge of the mantle, while the length, from base to outer 
edge, is about equal to the breadth of the back between the bases of 
the fins. 
Head very large and broad, the width exceeding that of the body. 
Eyes very large and prominent ; lower eyelids well developed, but 
not much thickened. Tentacles remarkably long and slender, in ex- 
tension about twice as long as the head and body together. The 
tentacular club is somewhat thicker than the rest of the arm, rather 
long, narrow-lanceolate, tapering to the tip, and covered with nu- 
merous minute, globular suckers, arranged in many rows (PI. XLYI, 
fig. 6, b-d). Sessile arms of moderate length, rounded, very slender 
at tip ; the 1st, 2d and 3d pairs are successively longer, while the 4th 
or ventral pair is about equal to the first. Suckers, (PI. XLYI, fig. 
6, «), rather small, arranged in two rows on all the arms. On all the 
arms the suckers are similar but are a little larger on the 3d pair. 
They are nearly globular, with a rather wide aperture, which is sur- 
rounded by a border covered with numerous small scales, arranged 
in many rows ; the scales of the marginal series are larger and project as 
fine denticles around the aperture. Color purplish brown, with rather 
large chocolate-brown chromatophores ; outer portion of fins pale, 
thin and translucent ; edges of mantle, siphon, under side of head 
and arms, and greater part of tentacular arms whitish, with only 
minute chromatophores. 
Measurements of Eossia megaptera. 
Inches. Millimeters. 
Length, end of body to dorsal edge of mantle, exclusive of mem- 
brane, ._ 1'25 32 
Length, end of body to ventral edge of mantle,. - 95 24 
Length, end of body to base of dorsal arms, 2 - 25 57 
Length, end of body to tip of dorsal arms, 340 86 
Length, end of body to tip of 2d pair, 3 75 95 
Length, end of body to tip of 3d pair, 4 08 103 
Length, end of body to tip of 4th pair, 3 - 75 95 
Length, end of body to tentacular arms, 7 - 45 188 
Breadth of body and fins together,. . _± 250 63 
Breadth of body between bases of fins, ’85 22 
Breadth of body beneath fins, exclusive of membrane, 110 28 
