Medullary shell ellipsoidal (with longitudinal main axis), one-third as broad as the cortical shell.
The dark spots are laid on in a longitudinal series of crescents.
The costae, longitudinal ribs or rows of spines on the outer surface of the theca.
The whole system has, in fact, been changed from the transverse to the longitudinal.
All longitudinal seams are butt-strapped, inside and outside, and secured by six rows of rivets.
longitudinal stability is governed by means of the front rudder.
The latter is the more primitive, and there seems good reason to believe that longitudinal stripes preceded transverse bars.
Stripe: a longitudinal streak of color different from the ground.
There is, however, a longitudinal groove of more or less depth.
He was lifted to the longitudinal center of the bed and placed on his back.
longitudinal lon·gi·tu·di·nal (lŏn'jĭ-tōōd'n-əl, -tyōōd'-)
Running in the direction of the long axis of the body or any of its parts.