JOUHNAL OF ENTOMOLOGY AND ZOOLOGY 41 



1. The chief ganglia are mucli as in other linear CoUembola. 



2. Cells of small size surround the central fibrous masses 

 of the ganglia. The ganglia below the head show fewer areas 

 of fibers uncovered with cells than the head ganglia. 



3. The cells of the ganglia extend down upon the con- 

 nectives. 



4. The connectives are bilateral and the lower ganglia show 

 a bilateral form with the two sides more or less distinctly 

 marked. 



5. There is some indication of the fusion of several parts 

 in many of the ganglia, but the last ganglion shows very 

 clearly, a thoracic part and an abdominal portion. The 

 abdominal portion seems to be composed of a number of fused 

 segments. 



PAPERS CITED 



Fernald, H. T. 1887 



The relations of arthropods. Biol. stud. Johns Hopkins univ. 

 vol. 4. 

 Hilton, W. A. 1913 



The central nervous system of Aphorura. Jour. ent. and 

 zool. vol. 5, no. 1. 

 Lubbock, J. 1873 



Monograph of the CoUembola and Thysanura. Roy. Soe. 

 Nicolet, H. 1841 



Recherches pour servir a I'histoire des Podurelles. Extr. 

 nouv. mem. soe. helv. so. nat. Neuchatel, vol. 6, sep. 1843. 

 Philiptschenko, Jur. 1912 



Beitrage zur Kenntnis Aptergoten. Ill Die Embryonalent- 

 wicklung von Isotoma cinerea Nic. Zeit. f. Wiss. Zool. Bd. 

 cm Heft 4. 

 Somnier, A. 1885 



Ueber Macrotoma plumbea. Beitrage zur Anat. der 

 Poduriden Zeit. Wiss. Zool. Bd. 41. 

 (Contribution from the Zoological Laboratory of Pomona College.) 



