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GASTROPTERIDAE 2 8 3
mantle reflexed and closed over the shell, in lacking central teeth in the
radula, and in having a much more degenerate shell.
Genus Philine Ascanius 1772
Philine quadrata S. Wood Quadrate Paper-bubble
Arctic Seas to North Carolina.
Figure 596
/4 inch in length, moderately fragile, semi-transparent, white, squarish-
oval and more constricted toward the top. Aperture large, flaring, and
rounded below. Early whorls very small. Sculpture of numerous spiral
rows of microscopic oval punctations. Suture deep. The narrow top of
the aperture is slightly higher than the apex. Commonly dredged off the
New England states from 20 to 400 fathoms.
Philifie lima Brown File Paper-bubble
Arctic Seas to Cape Cod, Massachusetts.
Figure $^i
H inch in length, much more oblong than quadrata, with the top of the
aperture well below the apex, and sinuate from a top view. Columella fairly
strong. Sculpture of spiral rows of scalloped lines forming chains, between
which are a single scalloped line. Moderately common in fairly shallow
but cold water. Ahas P. lineolata Couthouy.
Philifie sagra Orbigny Crenulated Paper-bubble
North Carolina to southeast Florida and the West Indies.
% to /4 inch in length, oblong, fragile, white, with a large aperture,
with numerous spiral lines of small oblong rings placed end to end, and char-
acterized by the finely crenulated lip. Top of the aperture the same height
as the apex. Not uncommon from 15 fathoms down.
Family GASTROPTERIDAE
Genus Gastropteron Kosse 181
Shell entirely internal and consisting of a minute, nautiloid, calcareous
spire. Body sack-shaped, with two large, wing-like, fleshy flaps, one on each
side of the body. These peculiar, small sea-slugs swim through the water
in a bat-like manner.
Gastropteron rubrum Rafinesque Bat-wing Sea-slug
West coast of Florida to the West Indies. Mediterranean.
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Figure 6oe