The _Scaphites_ have a singular boat-shaped form, wound with contiguous whorls in one part, which is detached at the last chamber, and projects in a more or less elongated condition. _Hamites_, _Crioceras_, and _Ancyloceras_ have club-like terminations at both extremities; they may almost be considered as non-involuted Ammonites with the spiral evolutions disconnected or partially unrolled, as in the engraving (Figs. 125 and 132). _Ancyloceras Matheronianus_ seems to have had spines projecting from the ridge of each of the convolutions. [Illustration: Fig. 133.--Shell of Turritella terebra. (Living form.)] [Illustration: Fig. 134.--Turrillites costatus. (Chalk.)] The _Toxoceras_ had the shell also curved, and not spiral. The _Baculites_ had the shell differing from all Cephalopods, inasmuch as it was elongated, conical, perfectly straight, sometimes very slender, and tapering to a point. 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). Among others, as examples of form, we append Figs. 133, 135, 136. This analysis of the marine fauna belonging to the Néocomian formation might be carried much further, did space permit, or did it promise to be useful; but, without illustration, any further merely verbal description would be almost valueless. [Illustration: Fig. 135--Terebrirostra lyra. _a_, back view; _b_, side view.] [Illustration: Fig. 136.--Terebratula deformis.] Numerous Reptiles, a few Birds, among which are some “Waders,” belong to the genera of _Palæornis_ or _Cimoliornis_; new Molluscs in considerable quantities, and some extremely varied Zoophytes, constitute the rich fauna of the Lower Chalk. A glance at the more important of these animals, which we only know in a few mutilated fragments, is all our space allows; they are true medals of the history of our globe, medals, it is true, half effaced by time, but which consecrate the memory of departed ages.