This species generally ranges fro 42mm x 37mm
x14mm. The shell is large, subtrigonal, inequilateral, anterior, and
posterior sides of approximately the same length. The anterior ear
is pointed and prominent, with a transversely rounded surface. The
posterior ear is rudimentary, and the ventral margin is sinuous. The
right valve is convex and the left is almost flat. The right valve also
has four prominent rounded ribs which have a prominent costella at the
summit. Each valve has a fluted border on the interior side.
This species is similar to Neithea whitneyi, but this species is
more nearly equilateral, narrower, and more convex. The ribs of the Neithea
whitneyi are more prominent than those of Neithea wrighti,
having steep sides, whereas those of Neithea wrighti have
more sloping sides. This species was found in the Georgetown
Limestone, Austin, Texas.