Fig. 1, 2. 
PLATE 47. 
274. 6. ENDOCERAS PROTEIFORME, va7. TENUISTRIATUM. (Pag. 209.) 
la. A small and slender specimen of this species. 
Lb. 
2a. 
A portion of the surface enlarged, showing the cancellated lines. 
This specimen presents very similar surface markings, and cannot be distinguished from the last, though 
the transverse strie are less prominent. The specimen consists of a double or triple tube; the outer one 
2b showing externally marks of septa, which are distant about one-fourth the diameter. The shell is 
exfoliated, and the surface markings are unknown. 
An enlarged portion of the surface : the longitudinal strig are too strong in the figure. 
. Asmall portion still farther magnified, showing the proportionate size of the transverse and longitudinal 
strie. 
. Transverse section of the specimen 2 a, showing the proportional diameters of the two, and the eortien 
of a still smaller tube within 2 a. 
269. 22. ORTHOCERAS JUNCEUM. (Pag. 204.) 
. A fragment denuded of the shell, showing a part of the outer chamber, and septate portion of the tube. 
. A smaller specimen, showing the marks of septa which appear to be slightly oblique. 
. A small fragment, showing the convexity of a single septum. 
. A section of the last, showing the central position of the siphuncle. 
. A small fragment, showing the closer approximation of the septa near the outer chamber. 
- A small fragment, preserving the shell and the striated surface. 
276. 8. ENDOCERAS PROTEIFORME, va7. LINEOLATUM. (Pag. 211.) 
. A fragment from the apex of one of these tubes, which is septate as in the larger specimens. 
. A transverse section. 
. A fragment which is annulated near the apex, and septate to the extreme point. 
. Section near the apex. 
. A fragment of a similar young shell, where the lamellose strie have become vesicular, giving a rough 
scaly appearance to the surface. 
