Page:Geology and Mineralogy considered with reference to Natural Theology, 1837, volume 1.djvu/286

 282 The transverse plates are outwardly concave, inwardly convex; and are perforated by a continuous siphuncle, (Pl. 44, Fig. 17, b.), placed on the inferior, or ventral margin.

We have already (Ch. XV. Section II.) described the horny pens and ink-bags of the Loligo, found in the Lias at Lyme Regis. Similar ink-bags have recently been found in connexion with Belemnites in the same Lias. Some of these ink-bags are nearly a foot in length, and show that the Belemno-sepiæ, from which they were derived, attained great size.