PLATE XXXIX. 
Zone of Aegoceras Ibex. 
Fig. 1. Aegoceras Loscombi, Sowerhy. Lateral view of a strongly ribbed specimen^ 
natural size. 
2. — — — Siphonal area, showing prominent ribs do. 
3. — — — Another specimen of the same species. 
4. — Ibex, Quenstedt. Lateral view, magnified. 
5. — — — Another specimen with definite ribbing. 
. 6. — DENsiNODUM, Queustedt. Lateral view, natural size. 
7. — — — Front view of the same. 
8. — — — Lateral view of another specimen, with 
an additional row of tubercles. 
9. — — Siphonal area of the same, showing ribs 
and spines. 
10, — — Lobe-line of this species. The siphonal 
shorter than the principal lateral lobe, 
which is split up into many divisions. 
All the specimens figured in this plate belong to my collection. 
