AUG 



On the Morphology and Physiology of the 

 Brain and Sense Organs of Limulus. 



By 



William Patten, Ph.D., 



University of North Dakota, Grand Forks, U.S.A. 



With Plates 1, 2, 3, 4, 5. 



Contents. 



Introduction . . . . . . . . p. 



Part I. — Sense Organs. 

 I. Gustatory Organs, 



A. Experimental Demonstration of the Presence of Three 

 Sets of Gustatory Organs in the Mandibles, p. 7. Method of 

 stimulating the organs, p. 7. Description of the reflexes caused by 

 stimulation of the same, pp. 7 — 9. Location of the organs — (1) By local 

 stimulation, p. 10. (2) By amputation of mandibles, p. 10. (3) By siiav- 

 ing off of spines, p. 10. Temporary suspension of reflexes, pp. 11, 12. 

 General remarks. 



B. Structure of Gustatory Cells of the Mandibular Spines, p. 

 12. Chitinous tubules, p. 13. The spindle, the axial, and external nerves, 

 p. 14. Gustatory cells, p. 15. Gigantic ganglion-cells, p. 15. Double nature 

 of gustatory cells, p. 15. Cuticular canals, p. 16. 



C. Experimental Demonstration of the Presence of Gustatory 

 and Temperature Organs in the Chelae, p. 16. Stimulation with 

 clam, ammonia, and warm air ; reflexes, p. 16. Experiments on amputated 

 chelae — description of the organs, p. 17. 



II. Olfactory Organs, p. 17. 

 A. Structure of the Olfactory Organ : external appearance, general 

 topography, cuticula, air in pore canals, spines, p. 17- Olfactory buds, 

 VOL. 35, PART 1. NEW SEE. A 



