THE CEPHALOPODA. 
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first contiguous, then separated from the others and projected in nearly a straight line, 
afterwards bent upwards and forwards, forming a horse-shoe curve. Septa transverse, 
symmetrical, divided regularly into unequal lobes. The recurved portion always without 
Fig. 87. — Scaphites gigas, Sowerby. 
septa, formed the dwelling chamber of the animal. Sipliuncle continuous and marginal. 
Mouth oval, provided with large protuberent bands, more or less prominent. All the 
species are obtained from the Cretaceous formation, and very large forms are obtained 
from the Neocomian strata. Scaphites gigas, Sow, (fig. 87), and Scaphites Ivanii, Puzos, 
(fig. 88), are typical forms of this group. 
Fig. 88. — Scaphites Ivanii, Puzos. 
Genus Ancyloceras, d'Ordigng. Shell spiral, rolled on the same plane, with very 
few whorls perfect, and not contiguous; the last separated from the others and projected 
Fig. 89. — Ancyloceras Matheromanum, d'Orb. 
outwards in a horizontal line, then turned upwards and inwards, forming an arcli opposed 
to the turns of the spine, the recurved portion without septa formed the dwelling chamber. 
