PLATE 46. 



Fig. 1, 2, 3. 276. 8. Endoceras proteiforme, mr. lineolatum. (Pag. 211.) 



1 a. A fragment of the parent shell, enclosing an embryo tube within the siphuncle. 



1 6. Transverse section of the lest, showing the large lateral or excentric siphuncle of the old shell. The shell 

 is crushed, as shown in the upper figure, so that a perfect section cannot be given. 



1 c. The surface marking of the young shell, enlarged. 



2 a, b. The external shell, and a longitudinal section of a young shell, which is destitute of septa. 



3. This is marked upon the surface as other specimens of the var. lineolatum. The septa in the figure are 

 erroneously represented by the engraver much more approximate than they are in the specimen. 



Fig. 4. 277. 9. Endoceras proteiforme, mr. STRANCfULATUM. (Pag. 212.) 



4 a. A fragment, showing the contraction below the aperture. 

 4 b. Transverse section, showing the nearly central position of the siphuncle. 

 4 c. A portion of the surface of a specimen enlarged. 



4 d, e. Two specimens denuded of the shell, showing a uniform character in the contraction of the tube, with 

 a slight difference in the distance of the septa. 



