68 



CEPHALOPODA. 



JBaculites Favjasii. — Faujacian Baculites- Plate X. 

 fig. 3. Erect, cylindrical, opposite sides smooth and de- 

 pressed ; sutures lobed and denticulate. 



Genus 7 — TURRILITES.— ZoworcA:. 



Generic Character. — Shell spiral, turreted, volutions con- 

 tiguous, and all conspicuous ; walls articulated with sinuous 

 sutures ; septa transverse, lobed, and lacinated at the margin ; 

 aperture nearly round. 



Turrilites costulata. — The Ribbed Turrilites. Plate 

 X. fig. 4. Erect, turreted ; volutions convex, with trans- 

 verse ribs each with a tubercle at its base. 



GewMs 8.— AMMONOCERATITES.—Zcmurc/i. 



Generic Character. — Shell horn-shaped, arcuated, scarcely 

 forming half a turn ; the walls articulated with sinuous, 

 laciniate, branched sutures; septa transverse, sinuous, im- 

 perforate; their margins lobed, laciniate; having a marginal 

 tube or siphon, which does not perforate the septa. 



Ammonoceratites ylossoidea. — The Glossoid Ammono- 

 CERATITES. Plate X. fig. 5. Large, thick, cylindrical, ar- 

 cuated, flattish on the sides, inside somewhat concave; apex 

 compressed, tongue-shaped. Twenty inches long. Fossil, 

 East Indies, and in Mount St, Catherine, near Rouen. 



Genus 9 ORBULITES.— Zamffrc^. 



Generic Character. — Shell subdiscoid, spiral, with the 

 volutions contiguous; the last enveloping the rest; the in- 

 ternal parietes articulated by sinuous sutures ; septa trans- 

 verse, lobed at their circiimference, perforated by a marginal 

 tube, 



Crbulites striata. — The Striated Orbclites, Plate 

 X. fig. 6. Suborbicular, umbilicated ; volutions transversely 

 and minutely striated and ribbed ; back rather acute. One 

 and a half inch in diameter. Fossil, 



