60 C. F. W. MCCLURE, The finer Structure of the Nerve Cells of Invertebrates. 



are stained. Cell body stains deeply, because of the presence therein 

 of chromophilous granules. Spindles in cell body. Flemming's sol.-prog. 

 iron-haem. Long, section. 



Fig. 11. Long section of nerve cell of Helix. Infra-oes. gang. 

 FiiEMMiNG's solution. Prog.-iron-haem. Marked concentric arrangement 

 of fibrils and granular rows in cell body. Fibrils in axis-cylinder pro- 

 cess. Spindles in cell body. 



Fig. 12. Helix. Cell from infra-oes. gang. Preparation the same 

 as in Fig. 11. Concentric arrangement of fibrils and granular rows. 

 Fibrils more undulating than in Fig. 11, and some run at angles to 

 the concentric system. Spindles. Pigment granules at base of process. 



Fig. 13. Helix. Preparation same as in Fig. 11. Long, section 

 of nerve cell from infra-oes. gang. Shows arrangement of granules on 

 and between fibrils. Spindles. 



Fig. 14. Long, section of nerve cell from infra-oes. gang, of Helix. 

 Sub.-prog.-iron-haem. Spindles. 



Fig. 15. Long, section of nerve cell from supra-oes. gang, oï Helix. 

 Flemming's solution. Iron-alum and Delafield's haem. Spindles im- 

 perceptible. 



Fig. 16. Long, section of nerve cell from infra-oes. gang, of Helix. 

 Flemming's solution. Prog.-iron-haem. Time of immersion in mordant 

 and haem. shortened. When after-differentiated, spindles imperceptible, 

 but pigment granules still clearly seen. 



Fig. 17. Long, section of nerve cell from infra-oes. gang, oï Helix. 

 Flemming's sol. -prog.-iron-haem. Marked concentric and parallel ar- 

 rangement of fibrils and granular rows. Spindles. 



Fig. 18 and 19. Bi-nuclear cells from the infra-oes. gang, oi' Helix. 

 Marked parallel arrangement of granular rows. Sub. prog.-iron-haem. 



Fig. 20. Long, section of nerve cell from infra-oes. gang, of Helix. 

 Sub.-ÜELAFiELD's hacm. Winding fibrils in cell body. Spindles imper- 

 ceptible. 



Figs. 21 and 22. Longitudinal sections of nerve cells from the 

 infra-oes. gang, of Helix. Flemming's sol.-prog.-iron-haem, Centrosomes 

 and spheres. Kidney-shaped nuclei. 



