THE GERM-CELLS OF CICADA (TIBICEN) SEPTEMDECIM. 457 



ABBREVIATIONS. 



A A, macrochromosome pair. 

 BB, CC, smaller chromosome pairs, 

 f., Centrosome. 

 cy., cytoplasm of oocyte. 

 cr., chromatoid body. 

 cr.n., chromatin nucleolus of oocyte. 

 e.s., egg-string of oocyte. 

 f.e., follicular epithelium. 

 id., idiozome. 

 I.n.c., ingested nurse-cells. 

 2V., Nebenkern of spermatid. 

 n.c., nurse-cell. 

 ncl., nucleus of oocyte. 

 ooct., oocyte. 

 pi., plasmosome. 

 5., spindle derivative. 

 X., sex-chromosome. 



All drawings were made at table level with the aid of a camera lucida. Plates 

 I, II, III, V (inc.) were made using a 1/12 oil immersion objective and a No. 12 

 ocular. They have been reduced } in reproducing them here. 



