PLATE XXIX. 



AKCELLA MITRATA. 



Figs. 1, 2. Inferior and lateral views from the same individual. In the former figure the central 

 undulating circle is the mouth ; and the second circle is produced by the border of the base of the shell. 

 In the latter figure, the body of the sarcode is seen attached to the mouth of the shell by a long neck, 

 and the periphery, by means of numerous threads, to the inside of the shell. China Lake, Uinta 

 Mountains, Wyoming Territory, August, 1877. 250 diameters. 



Figs. 3, 4. Inferior and lateral views from an individual similar to the former. Atco, N.J. , Sep- 

 tember, 1877. 250 +. An abundant form. 



Figs. 5,6. Inferior and lateral views of an individual. Absecom pond, New Jersey, September, 

 1874. 350 -J-. The dotted appearance of the shell in tig. 6 represents the cancellated structure. 



Figs. 7, 8. Inferior and lateral views of an individual in which the sarcode is retracted into the 

 fundus of the shell. The sarcode contained a single nucleus. Atco, N. J., September, 1877. 250 -)-. 



Figs. 9, 10. Lateral and inferior views of a specimen, in which the shell has a pyramidal summit, 

 perpendicular sides, and a heptagonal base. Absecom pond, New Jersey, October, 1877. 250 -f . 



Fig. 11. Lateral view of a specimen, exhibiting the sarcode and its attachments, and projected 

 pseudopods. Same locality, May, 1877. 500 -}-. 



Fig. 12. Lateral view of an empty shell, with even, dome-like fundus. Absecom pond, N. J., Sep- 

 tember, 1875. 250 -)-. 



Fig. 13. Lateral view of a colorless individual, exhibiting the sarcode and its connections. Atco, 

 N. J. , September, 1877. 250 -f . 



Fig. 14. Lateral view of an individual. Absecom, N. J., September, 1875. 250+. 



Fig. 15. Lateral view, with visible sarcode. Tobyhanna, Pokono Mountain, Pennsylvania, July, 

 1876. 250 +. 



Fig. 16. Lateral view of a large individual, with shell having depressed sides and pyramidal dome. 

 Atco, N. J., September, 1877. 250 +. 



Fig. 17. Lateral view of an individual with perfectly colorless shell; with the sarcode audits 

 attachments distinctly visible, and with protruded pseudopods. The dotted appearance on part of the 

 shell represents the cancellated structure in focus. Absecom pond, N. J., August, 1874. 250 -)-. 



Fig. 18. Lateral view of a specimen, with visible sarcode and protruded pseudopods. Absecom, 

 N. J., September, 1874. 350 +. 



Figs. 19, 20. Inferior and lateral views from an individual. With the preceding. 350 -f. 



Figs. 21,22. Inferior and lateral views from an individual, in which the sarcode was contracted 

 into a spherical ball lying on one side of the cavity of the shell. Found with the preceding. 



Fig. 23. Lateral view of a pyriform specimen. With the preceding. 350 -)-. 



Fig. 24. Lateral view from a specimen, in which the sarcode contained a multitude of chlorophyl 

 grains. Absecom, N. J., July, 1876. 250 -f . 



