54 Journal of Comparative Neurology. 



EXPLANATION OF FIGURES. 

 PLATE V. 

 Fig. /. Diagram of the skin of the sexual organs, after Dogiel. 

 Fig. 2. End-organs in the skin of the tree frog, originaL Teased prep- 

 aration. 



Fig. J. Sense bud of young salamander. Original. 



Fig. 4. Skin of tadpole with nerve endings and the transitory skeins inter- 

 preted as nerve endings by Pfitzner. 



Fig. 5. Skin of very young tadpole. Original. 



Fig. 6. Skin of tadpole, near angle of mouth, Original. 



Fig. 7. Sense bud of Amblystoma. Original. 



Fig. 8. Nerve endings in the epithelium of the frog, according to Bethe. 



A. — »' Gabelzelle," from sensory papillae of tongue. 



B, — Cylinder cells. 



C. — Isolated rod cell. 



D. — Upper part of papilla. 



E. — Ciliate cell of palate. 

 Fig. p. Nerve ending in the human conjunctiva. Dogiel. 

 Fig. 10. Nerve endings in Jacobson's organ. Lenhoss^k. 

 Fig. II. Nerve endings in the taste buds. Arnstein. 



PLATE VI. 



Fig. 12. Section from the skin of the head of a tree-toad, a, nerve bun- 

 dle and endings; b, gland ; c, corium ; d, small gland; e, chromatophore. 



Fig. I J. Skin of head of leopard frog showing cellular nerve endings in 

 groups penetrating the skin. 



Fig. 14. Similar endings from the tree frog. 



Figs. 75, 16. See Plate VIII. 



Fig. 17. Part of the skin of the axolotl showing the nerve bundle on its 

 way to the skin and the pericellular net-work. 



Fig. 18. Skin of axolotl showing pericellular net-work and the nerve-fibers 

 entering from below. 



Fig. ig. Similar section fixed in Flemming's solution. 



Fig. 20. A section of portion of axolotl skin where the Leydig cells [L. c.) 

 are two-layered. Proliferating cells [k) in lower series of protoblasls; c, corium; 

 B, V.y capillary ; nerve fibers entering from below. 



Figs. 2I-2J. See Plate VIII. 



Fig. 24. Skin of tadpole as figured by Pfitzner. 



