Pomona College, Claremont, Californi 



67 



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

 hut with feuer more flattened cells. 

 liaiutilol. E. REFERENCES 



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



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

 Dftage et Herouard 



Traite de zoologie concrete. \'ol. 3, Les Echinodermes. 

 Ilamann, U. 1883 



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



Zool. vol. 39. 

 Krohn. .1. 1841 



N'eher 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 ilecp strand is sliown 

 on the upper side. X 350. 



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

 one-lialf of the radial nerves are shown in cross section. X 350. 



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



(C.iintrihutinn from ihe '/.rinlng'ual Drf<arlmntl of Pomona CoUcifC.) 



