232 



JAMES ERNEST KINDRED. 



to the activities of the leucocytes in other animals, they are so 

 termed. 



FIGS. 1-14. Active leucocytes of the Echinoderms, camera lucida, X 650. i. 

 Le plaster las hexaclis. 2. Solaster simpsonii. 3. Dermaster imbricata. 4. Pycno- 

 podia helianthoides. 5. Pisaster ochraceus. 6. Henricia leviuscula. 7. Evaslerias 

 troschelii. 8. Strongylocentrolus drobachiensis. 9. Ophiopholis acttleata. 10. S. 

 franciscanns. n. Echinarachnius eccentricus. 12. Cucumaria japonica. 13. C. 

 chronjhelmii. 14. Stichopus calif ornicus. 



Text-figures 1-14 are camera lucida drawings of the active 

 phases of the leucocytes (" bladder amcebocytes" of Theel) of the 

 whole series of Echinoderms studied. Examination of these 

 figures shows the general morphological similarity of these cells 

 to each other, the only distinct difference being that of size, which 

 varies from 7-14 microns in endoplasmic diameter. In all of the 

 cells it will be noted that the ectoplasm is clearly marked off from 

 the endoplasm and is produced into a varying number of rapidly 

 changing delicate flaps. These flaps are constantly being with- 

 drawn and extended and may be regarded as modified pseudo- 

 podia. By means of these flaps the leucocyte progresses slowly 

 through the fluid. That the surface of the cell is covered with a 

 sticky fluid is evidenced by the manner in which particulate 

 matter adheres to the flaps. When the flaps are withdrawn the 

 particles which adhere to them are ingested. 



