I 1 8 J. F. MCCLENDON. 



In the insect, Ulida hyalina (McClendon, '02), some of the 

 eggs become modified to serve as protection to the other eggs. 

 These abortive eggs or "repagula" develop in different ovarian 

 tubules from the other eggs, and may receive different nour- 

 ishment, but are of interest as modified sexual elements. 



For comparison, each bundle of spermatids in Pandarns may- 

 be said to be provided with a cytoplasmic cytophore in the mid- 

 dle of the bundle and a greatly modified unicellular cytophore at 

 the end of the bundle. Cytophores and basal cells are differ- 

 entiated (visibly) after the second spermatocytic division (Kor- 

 scheldt & Heider) in invertebrates. Nurse cells in ovaries are 

 differentiated at an earlier stage (Marshall, '07). 



Biological Laboratory, 



Randolph-Macon College, 

 Ashland, Virginia, 

 March 30, 1 907. 



REFERENCES. 

 Boveri, T. 



'04 Ergebnisse iiber die Konstitution der Chromatischen Substance des Zellkerns. 

 Jena, 1904. 



Foot and Strobell. 



'07 The " Accessory Chromosome " of Anasa tristis. Biol. Bull., XII., No. 2. 

 Gibson, S. 



'86 Etude Comparee da la spermatogenese chez les Arthropodes. La Cellule, 

 Tome 1 and 2. 



Goldschmidt 



'06 Die Chromidien der Protozoen. Arch. f. Protistenkunde, 5, p. 130. 



Gross, J. 



'06 Die Spermatogenese von Pyrrochoris apterus L. Zool. Jahr. (Anat.), 23, 

 No. 2. 

 Guthres, S. 



'07 Zur Kenntnis der Heterochromosomen. Arch. Mik. Anat., 69, No. 3. 



Heider, K. 



'79 Die Gattung Lernanthropus. Arb. Zool. Ins. Wien, 2. Bd., 3 Hft. 



Ishikawa, A. 



'92 Studies in Reproductive Elements, I. Spermatogenesis, etc. in Diaptomus. 

 Jour. Coll. Sc. Japan, Vol. 5. 



Lerat, Paul. 



'02 La premiere cinese de maturation — et la spermatogenese du Cyclops strenuus. 

 Anat. Anz., 21 Bd., p. 407. 



Marshall, W. S. 



'07 Contributions toward the Embryology and Anatomy of Polistes pallipes, II. 

 Zeit. wiss. Zool., 86, Hft. 2. 



