PLATE XLY. 



Figs. 1-3.— HETEKOPHEYS ? ; 



Fig. 1. Individualfromsphagnous swamp, Broad Mountain, Pennsylvania. 500 diameters. 

 Fig. 2. Individual, from Uinta Mountains, Wyoming, July, 1877. 1,000 diameters. 

 Fig. 3. Individual, associated witli the last. 500 diameters. 



Fig. 4.— HETEEOPHEYS ? 



From spbagnum--water, Vineland, N. J., August, 1876. 400 diameters. 



Figs. 5, 6.— HETEEOPHEYS ? 



Successive views of the same individual. Uinta Mountains, Wyoming, August, 1877. 1,000 

 diameters. 



FiGS.7,8.— CIPLOPHEYS AECHEEI? 



Two views of the same specimen. Swamp-water, Broad Mountain, Pennsylvania, Septcmljer, 

 187C. 500 diameters. 



FiG.9.— HYALOLAMPE FENESTEATA. 

 From sphagnum, Absecom, N. J., June, 1877. 500 diameters. 



Figs. lO-lC— VAMPYEELLA LATEEITIA. 



Figs. 10, 11. Two views of the same individual ; the former as first observed, the latter as seen 

 two hours subsequently. Fort Bridger, Wyoming, August, 1877. COO diameters. 



Fig. 12. Individual, from Absecom pond, New Jersey, September, 1875. 800 diameters. 



Fig. 13. Individual, found with that of figs. 10, 11. 500 diameters. 



Fig. 14. Individual, ftom Fort Bridger, Wyoming, July, 1877. £00 diameters. 



Fig. 15. Individual, containing bright green alga3. Spring on Darby Creek, Delaware County, 

 Pennsylvania, April, 1875. 500 diameters. 



Fig. 16. Individual, from bog- water, Longacomiug, N. J., October, 1874. 800 diameters. 



Figs. 17, 18.— HYALODISCUS EUBICUNDUS? 



Fig. 17. Individual, from ooze of Cooper's Creek, Camden, N. J., May, 1874. COO diameters. 

 Fig. 18. Individual found with the preceding. 1,000 diameters. 



