JOIJENAL 



OF THE 



ROYAL MICROSCOPICAL SOCIETY. 



APRIL, 1915. 



TRANASCTIONS ' OF THE SOCIETY. 



II. — Notes on the Structure of Test's of Fresh-water Rhizopoda. 

 By George Herbert Wailes, F.L.S.* 



(Read March 17, 1915.) 

 Plates II and III. 



The Rhizopoda are amoeboid animals, and may be classed as 

 parasitic, fresh-water, or marine, according to their habitat ; a few 

 of the fresh-water species can live in salt or brackish water. 

 Under the term " fresh-water " are included terrestial species which 

 inhabit mosses of all kinds and are capable of enduring more or 

 less prolonged dessication. They are to be found nearly every- 



* Communicated by John Hopkinson, V.P.R.M.S. 



EXPLANATION OF PLATE II. 



Fig. 1, 2. — Difflugia bicornis Penarcl. Three-horned variety, x 300. 1. Buccal 

 view. 2. Side view. Showing a fourth horn placed unsymmetri- 

 cally between two of the three normal horns. 



,, 3,4. — D. bacillariarum var. elegans (Penard) Cash. X 300. 3. Broadview. 

 4. Narrow view. 



,, 5. — Heleopera nodosa Wailes. X 250. 



,, 6. — Nebela scutellata Wailes. x 320. 



„ 7. — N. dentistoma var. hesperia Wailes. Broad view of test, showing various 



scales, plates, etc., incorporated in it. x 300. 



,, 8. — Euglypha cristataJjeidy. x 400. 



,, 9. — E. scutigera Penard. x 300. 



„ 10-12.— E. strigosa (Ehrenb.) Leidy. X 350. 10. Broad view. 11. Narrow- 

 view. 12. Buccal view. 



„ 13,14.— E. armata Wailes. 13. Side view of test, x 300. 14. Detached 

 spine-bearing scale. X 400. 



,, 15. — E. brachiata var. librata Wailes. x 400. 



16.— Cyphoderia ampulla Ehrenb. Outline of test. X 200. (The test of 

 C. trochus var. amphoralis Wailes is of a similar form.) 



April 21st, 1915 I 



