Therefore the sagittal constriction exists only in the basal half of the inversely cordate shell.
Its position is well seen in a sagittal section, such as Fig. 117.
sagittal ring semicircular, broad, latticed, with two pairs of irregular dorsal and two pairs of ventral pores.
One of the annular constrictions is constantly in the sagittal plane (separating the right and left halves of the shell).
The point at which the division has reached the sagittal suture is situated a little behind the middle of the latter.
The third or sagittal girdle becomes developed from the second almost in the same manner as the second from the first.
This margin lies in the sagittal plane of the body, whilst the two flat sides are right and left.
A sagittal septum sometimes becomes developed, beginning with two polar beams, rising from the poles of the principal axis.
The skeleton is composed of a sagittal ring and a basal tripod, without latticed cephalis.
The two lateral feet (right and left) are larger and more branched than the two sagittal feet (sternal and caudal foot).
sagittal sag·it·tal (sāj'ĭ-tl)
Of or relating to the suture uniting the two parietal bones of the skull.
Of or relating to the sagittal plane.