PLATE XXXIX. 



TRINEMA ACINUS. 500 diameters, except where specially indicated. 



Figs. 1-5. Large individuals, from sphagnum of Absecom, N. J. 



Fig. 1. Inferior view* of an empty shell, exhibiting the mouth at lower part of the figure, and the 

 circular plates with beaded margins. Fig. 2. Lateral view of the same specimen. 



Fig. 3. Inferior view of a second specimen. 



Fig. 4. Inferior lateral view of another specimen. 



Fig. 5. Inferior view of a living specimen. Tho pseiulopods are extended ; and the sarcode 

 exhibits the nucleus, several contractile vesicles, together with a quantity of yellowish food material. 

 April, 1875. 



Figs. 0,7. Two views, inferior, of the same individual, showing successive changes in extension 

 of the sarcode. Fairmount, Philadelphia. 



Fig. 8. Inferior view of a living specimen ; the sarcode exhibiting the nucleus, three contractile 

 vesicles, and a single forked pseudopod. Pokono Mountain, Pennsylvania, July, 1876. 



Fig. 9. Inferior view of a living specimen. Sphagnum, Broad Mountain, Pennsylvania, Septem- 

 ber, 1876. 



Figs. 10, 11, Inferior and lateral views of an empty shell. With moss in crevices of the pave- 

 ments of Philadelphia. 



Figs. 12, 13. Inferior and lateral views of a living specimen. From moss and lichens in the crotch 

 of an apple-tree. Swarthmore, Delaware County, Pennsylvania, December, 1877. 666 diameters. 



Figs. 14, 15. Inferior and lateral views of an empty shell. Sphagnum, Broad Mountain, Penn- 

 sylvania. 



Figs. 16, 17. Inferior and lateral views of a living specimen. Swamp near Bristol, Pa., Septem- 

 ber, 1876. 



Fig. 18. Inferior view of a living individual. Uinta Mountains, Wyoming, July, 1876. 



Figs. 19, 20. Lateral and inferior views of an empty shell. Sphagnum of Egg Harbor, N. J. 

 606 diameters. 



Fig. 21. Inferior view of a living specimen. Uinta Mountains, Wyoming, July, 1876. 



Figs. 22, 23. Lateral and inferior views of a living individual. Found together with Euglypha 

 and Rotifers, among moss, in the yard of my house, Philadelphia, August, 1878. 1,000 diameters. 



Fig. 24. Inferior view of a minute living individual. Sphagnum of Mount Vernon, Ala., Octo- 

 ber, 1875. 



Fig. 25. Apparent production or birth of an individual from its parent. The upper is the parent, ; 

 tho lower the ofispring. Sphagnum of Pokono Mountain, Pennsylvania, July, 1876. 



Fig. 26. Lateral view of a specimen, in which the sarcode is encysted. Yard of my house, Phila- 

 delphia, June, 1874. 



Fig. 27. Lateral view of a similar specimen, from sphagnum of Absecom, N. J., October, 1875. 



Figs. 28, 29. Inferior and lateral views of a shell. Ditches below Philadelphia. 



Fig. 30. Inferior view of an empty shell. Broad Mountain, Pennsylvania. 



Fig. 31. Inferior view. Darby pond, Pennsylvania. 



Figs. 32, 33. Inferior and lateral views. Mount Vernon. Ala. 



Figs. 34, 35. Inferior and lateral views. Fort Bridger, Wyoming Territory. 



Figs. 36, 37. Lateral views of two specimens. Fort Bridger, Wyoming. 



Fig. 38. Minute specimen, inferior view. Mount Vernon, Ala. 



Fig. 39. Inferior view. Uinta Mountains, Wyoming. 



Figs. 40-42. Inferior views of three shells. Mount Vernon, Ala. 



Fig. 43. Lateral view of a miuuto shell. Uinta Mountains, Wyoming. 



Fig. 44. Inferior view of a living specimen. Sphagnum, Swarthmore, Delaware County, Penn- 

 sylvania, September, 1874. 



Fig. 45. Inferior view of a shell. Spring near Darby, Delaware County, Pennsylvania. 



Fig. 46. Inferior view of a shell. Mount Vernon, Ala. 



Figs. 47,48. Inferior and lateral views. Jacksonville, Fla. 



FlGS. 49, 50. Inferior and lateral views. Sphagnum, Mount Vernon, Ala. 



Figs. 51,52. Inferior and lateral views. Sphagnum, Mount Vernon, Ala. 



Figs. 53, 54. Inferior and lateral views. Jacksonville, Fla. 



Figs. 55, 56. Inferior views of two specimens. Fort Bridger, Wyoming. 



Figs. 57, 58. Inferior and lateral views. Mouth of a cave on Bushkill Creek, near Easton, Pa. 



Fig. 59. Inferior view. Mount Vernon, Ala. 



Fig. 60. Lateral view. Uinta Mountains, Wyoming. 



Figs. 01,02. Inferior and lateral views. Jacksonville, Fla. 



Fig. 63. Inferior view. Mount Vernon, Ala. 



Fig. 64. Infei'o-lateral view, with sarcode resolved into spores. Sphagnum, Absecom, N. J., Octo- 

 ber, 1875. 



Fig. 65. Inferior view. Mouth of cave, Bushkill Creek, Easton, Pa. 



Fig. 66. Lateral view. Swarthmore, Pa. 



Figs. 67, 68. Inferior anil lateral views. Jacksonville, Fla. 



* Tho inferior views as they usually appear, tilted forward, or lying in tho field of the microscope on Iheir anterior 

 tace. From the transparency of the specimens they appear the same when viewed from behind or in front. 



