PLATE XXIII. 



Figs. 1-7.— NEBELA COLLAEIS. 



Narrower variety than the more common form, with a pair of minute apertures rendered promi- 

 nent at the narrower border of the shell, marked a in fig. 4. 



Fig. 1. Broader lateral view, with protruded pseudopods. The shell composed of large oval 

 plates. Sphagnum of Absecom, N. J., September, 1874. 533 -f. 



Fig. 2. Broader lateral view of an individual with encysted sarcode, and shell closed with a thick 

 laminar operculum, above which there is an accumulation of discharged excrementitious matters. 

 Shell composed of intermingled linear and circular plates. Fig. 3. Outline of the narrower lateral 

 view of the same. Sphagnum of Schooley's Mountain, New Jersey, October, 1874. 533 -)-. 



Figs. 4-6. Three views of the same individual : — fig. 4, broader lateral view ; fig. 5, narrower 

 lateral view ; the sarcode visible in both and with protruded pseudopods. Shell composed of circular 

 plates decreasing in size towards the mouth. Fig. 6. Outline of a transverse section. Sphagnum of 

 Absecom, N. J., May, 1876. 533+. 



Fig. 7. Broader lateral view of an individual with reticulated shell and encysted sarcode ; the 

 throat of the shell closed by a lenticular operculum. Absecom pond, New Jersey, October, 1675. 350 -f-. 



Figs. 8-19.— NEBELA FLABELLULUM. 



Fig. 8. Broader lateral view of a living individual iu the normal position, with protruded pseudo- 

 pods, aud with shell composed of nearly uniform, large oval plates. The large clearer central spot at 

 the fundus of the sarcode indicates the nucleus; and foui clear vesicles at the periphery contiguous to 

 the latter indicate contractile vesicles. Breadth of shell, 0.097 mm. by 0.04 mm. Sphagnum of Abse- 

 com, N. J., September, 1875. 700 diameters. 



Fig. 9. Broader lateral view of an individual, with protruded pseudopods. Shell composed 

 of mostly circular plates of very variable size. Two coutractile vesicles are seen, of which one occupies 

 a prolongation of the sarcode at the fundus on the left. Fig. 10. Outline of a transverse section, with 

 the mouth. Same locality. 500 diameters. 



Fig. 11. Broader lateral view of a living individual. Shell composed of circular plates, of which 

 the larger ones are scattered with an approximation to regularity, while the smaller ones occupy the 

 intervals. Sphagnum, Swarthmore, Delaware County, June, 1877. 



lies. 12, 13. Two views of the same individual, with the sarcode contracted into a central ball. 

 Shell composed of circular plates. The narrower side viewed in a different focus from the broader side. 

 Absecom, N. J., October, 187 I. 



Fig. 14. Broader lateral view of an individual, with the sarcode contracted into a ball, and con- 

 taining a large and uniform granular nucleus. Shell composed of linear plates intermingled with round 

 and oval plates; and the mouth closed by an operculum. Longicomiug, N. J., October, 1875. 



Fig. 15. Broader lateral view of an individual in which the shell is not prolonged into a neck. 

 Common form in sphagnum of Tobyhanna, Pokono Mouutain, Pennsylvania, July, 1876. 



Fig. 16. Broader lateral view, reversed, of an empty shell composed of large mostly circular 

 plates with the intervals occupied by small ones. Found in the same locality. 



Fig. 17. Empty shell composed of oval plates. Absecom, N. J. 



Fig. 18. Empty shell, of circular and oval plates of variable size, mingled with linear plates. 

 With the preceding. 



Fig. 19. Empty shell of circular, oval, square, and linear plates. Egg Harbor, N. J., May r , 1877. 



