Fig. 134.—Turrillites costatus.
(Chalk.)
The Turrilites have the shell regular, spiral, and sinistral; that is, turning to the left in an oblique spiral of contiguous whorls. The engraving will convey the idea of their form ([Fig. 134]).
Fig. 135—Terebrirostra lyra.
a, back view; b, side view.
Among others, as examples of form, we append [Figs. 133], [135], [136].
