PLATE XX. 



Figs. 1-10.— HYALOSPHENIA CUNEATA. 



Fig. 1. Broader lateral view of an individual with a pair of projected pseudopods. The attach- 

 ment of the interior pseudopodal threads produces indentations of the delicate shell. Spring at Lans- 

 downe station, Delaware County, Pennsylvania, April, 1875. 500 diameters. . 



Fig. 2. Broader lateral view of another individual from the same locality, January, 1878. Fig. 3. 

 Transverse section of the same. 666 diameters. 



Figs. 4, 5. Broader and narrower lateral views of an individual, from the same locality, June, 

 1874. 666 diameters. 



Figs. 6-10. Series of views of a pair of individuals in conjugation exhibiting successive changes 

 in the sarcode. Same locality as the preceding, June, 1874. £00 diameters. 



Figs. 11-18.— HYALOSPHENIA TINCTA. 500 diameters. 



Fig. 11. Empty shell, showing minute apertures at the margin, indicated by the arrows a. 

 Sphagnum, Atco, N. J. 



Fig. 12. View of the broader side of a Uvirig individual, showing the retraction of the sarcode 

 from the mouth of the shell while pseudopods are yet projected. Fig. 13. Transverse view of the same. 

 Sphagnous swamp, Tobyhanna, Poliono Mountain, July, 1876. 



Fig. 14. Broader side view of an individual, with projected pseudopods. Fig.. 15. Transverse 

 section of the same, with the mouth. 



Figs. 16, 17. Broader and narrower lateral views of another individual, with pseudopods with- 

 drawn. Siime locality as the preceding. 



Fig. 18. Small empty shell, showing minute apertures at the border. Same locality. 



Figs. 19-29.— HYALOSPHENIA ELEGANS. 5C0 diameters. 



Figs. 19-21. — From the same individual. Fig. 19. Broader lateral view, showing the interior sar- 

 code attached by pseudopodal threads, and with projected pseudopods. Fig. 20. Narrower lateral view of 

 the shell, showing the cup-like depressions. Fig. 21. Transverse view, with the mouth. Sphagnum, 

 Absecom, N. J., October, 1874. ' 



Fig. 22. Broader lateral view of an individual with ample sarcode and projected pseudopods. jp. r. 

 contractUe vesicles. With the preceding. 



Fig. 23. Broader lateral view of an individual with projected pseudopods. The sarcode exhibits 

 at its periphery four cdutractile vesicles ; and the nucleus is eccentric. 3readth of shell 0.064 mm. by 

 0.032 mm. Absecom, May, 1877. (The lithographer has erroneously colored the sarcode.) 



Fig. 24. Broader lateral view, reversed, with the sarcode contracted into an ovoidal ball ; and 

 exhibiting in the neck a number of round balls, supposed to be excrementitions and discharged from 

 the sarcode. Sphagnum,' Swarthmore, Delaware County, April, 1877. 



Fig. 25. Specimen containing isolated corpuscles, probably spores or germs, resulting from the 

 segmentation of the original sarcode. Sphagnum, Absecom, October, 1874. 



Fig. 26. Narrower Lateral view of the shell of the same. 



Fig. 27. Individual with the sarcode in an encysted condition. A frequent form and condition in 

 sphagnum of Schooley's Mountain, New Jersey, October, 1874. 



Fig. 28. Specimen- with encysted sarcode. The aiTow a points to one of the minute apertures of 

 the shell. Absecom, N. J., April, 1876. 



Fig. 29. Specimen with encysted sarcode. The mouth of the shell closed with a number of balls 

 discharged from the sarcode. A frequent condition at Absecom, N. J., November, 187 ,. 



