Pomona College, Claremont, California 



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Small cells at the bases of tentacles ae similar to the radial nerves in structure, 

 but with fewer more flattened cells. 

 Baudelot, E. REFERENCES 



Etudes generales sur le systeme nerveux contrib. a 1' hist, du syst. nerv. 



des Echinoderms. Arch. zool. exp. vol. i. 

 Del aye et HerouarJ 



Traite de zoologie concrete. Vol. 3, Les Echinodermes. 

 Hamann, 0. 1883 



Beitrage zur Histologic der Echinodermen. I Die Holothurien. Zeit. Wiss 



Zool. vol. 39. 

 Krohn, A. 1841 



Neber die anordnung des Nervensystems der Echiniden und Holothurien im 



Allgemeinen. Muller Arch. Anat. 



Central New Svstem Holothurians 



Fig. 1 and 2. Drawings of cross sections of the radial nerve of Stichopus. A 

 little more than one-half of the section is shown. The smaller deep strand is shown 

 on the upper side. X 350. 



Fig. 3 and 4. Sections through the radial nerves of a young Stichopus. About 

 one-half of the radial nerves are shown in cross section. X350. 



Fig. 5. Cross section of the radial nerve trunk of Leptosynapta. X 350. 



(Contribution from the Zoological Department of Pomona College.) 



