Henchman. — Nervous System of Limax. 



PLATE II. 



All the figures of this plate are magnified 250 diameters. 



Fig. 14. A section parallel to the sagittal plane from an individual of the eighth 

 day. It passes through the cerebral and pleural ganglia of the left 

 side of the body, and also shows four cells of t he left otocyst poste- 

 rior to the pleural groove. The material was killed in 0.33% chromic 

 acid, and stained in alcoholic borax-carmine. 



" 15. The left surface of a section cut parallel to the sagittal plane from an 

 embryo of the seventh day (but more advanced than in Figs. 6-9), pass- 

 ing through the cerebral invagination and a group of cells belonging 

 to the proliferated portion of the cerebral ganglion of the right side. 

 The material was treated as in that of Fig. 14. 



" 16. A section from the same individual as Fig. 14, passing through the cell 

 proliferation to form the visceral ganglion of the right side. 



" 17 and 18 are from the same individual as Fig. 15. 



" 17. A section passing through the visceral ganglion and the external opening 

 of the nephridial organ of the right side. 



" 18. The second section nearer the median plane than Fig. 17, showing the 

 cell proliferation to form the right visceral ganglion. 



" 19. From the same individual as Fig. 14, showing the cerebral invagination 

 and proliferation of the right side, and also a cross section of the 

 primitive kidney. 



" 20-24. The anterior surfaces of transverse sections from an embryo of the 

 ninth day. Material killed in Perenyi's fluid, and stained in alcoholic 

 borax-carmine. 



" 20. Portion of a section which passes through the proliferation of cells form- 

 ing the pleural ganglion (dorsal to the pleural groove), and through 

 the pedal ganglion and the otocyst of the left side. 



" 21. The 37th section, which passes through the cerebral commissure and 

 shows the proliferation of cerebral cells on the left side. 



" 22. The 51st section, which passes through the buccal ganglion of the 

 right side. 



" 23. The 69th section, showing the unsymmetrical position of the visceral 

 ganglia and a cross section of the right nephridial organ. 



" 24. The 75th section of the series, passing through the abdominal ganglion 

 and the invagination to form the mantle cavity. It is in the region 

 where the anterior portion of the embryo is bent backward over the 

 foot by the nutritive sac ; the foot is not represented in the figure. 



