Fig. 1. 
PLATE 46. 
274. 6. ENDOCERAS PROTEIFORME, va7’. TENUISTRIATUM. (Pag. 209.) 
1 a. Fragment of the young shell, natural size, showing only the transverse strie. 
1b. Enlarged portion, showing the longitudinal striz. 
Fig. 2, 3, 5. 275. 7. ENDOCERAS PROTEIFORME, var. TENUITEXTUM. (Pag. 210.) 
2a. 
2b. 
3 a. 
A fragment of a tube destitute of septa, presenting strong transverse and longitudinal striz. 
A portion of the surface enlarged. 
A specimen with finer striz, showing the marks of septa. 3b. Portion of the surface enlarged. 
. This specimen presents a double tube or sheath, the outer one (or embryo tube) being entirely smooth ; 
while the inner one, which is but little smaller, is marked by longitudinal and transverse strie as in the 
preceding figures. 
. A portion of the same enlarged to show the striz. 
. A section of the same, showing no septa or siphuncle. 
276. 8. ENDocERAS PROTEIFORME, var. LINEOLATUM. (Pag. 211.) 
. A young shell, with the outer chamber and apex broken off. 
. Transverse section of the larger extremity, showing the position of the siphuncle. 
. A fragment of the smaller extremity of the shell, which is annulated by fine sharp ridges. 
. The same enlarged. 
. A fragment of another tube, marked like 4 a, showing at the lower extremity a septum and siphuncle. 
