MULTIPLE CHROMOSOMES 589 



20. Multiple chromosomes are of two types (a) those between 

 euchromosomes and heterochromosomes and (b) those between 

 euchromosomes alone. 



VI. BIBLIOGRAPHY 



A. Additions to my former list' ('14) of papers on Orthopteran spermatogenesis 



Carothers, E. Eleanor 1917 The segregation and recombination of homol- 

 ogous chromosomes as found in two genera of Acrididae (Orthoptera). 

 Jour. Morph., vol. 28. 



Harman, Mary T. 1915 Spermatogenesis in Paratettix. Biol. Bull., vol. 29. 



McClung, C. E. 1914 A comparative study of the chromosomes in Orthop- 

 teran spermatogenesis. Jour. Morph., vol. 25. 



MoHR, Otto L. 1915 Sind die Heterochromosomen wahre Chromosomen? 

 Archiv f. Zellforsch., Bd. 14. 



Payne, Fernandxjs 1914 Chromosomal variations and the formation of the 

 first spermatocyte chromosomes in the European earwig, Forficula sp. 

 Jour. Morph., vol. 25. 



1916 A study of the germ cells of Gryllotalpa borealis and Gryllotalpa 

 vulgaris. Jour. Morph., vol. 28. 



Robertson, W. R. B. 1915 Chromosome studies III. Inequalities and de- 

 ficiencies in homologous chromosomes: their bearing upon synapsis 

 and the loss of unit characters. Jour. JNIorph., vol. 26. 



1916 Chromosome studies I. Taxonomic relationships shown in 

 chromosomes of Tettigidae and other subfamilies of the Acrididae: 

 V-shaped chromosomes and their significance in Acrididae, Locustidae 

 and Gryllidase: chromosomes and variations. Jour. Morph., vol. 27. 



Senna, Angelo 1911 La spermatogenesi di Gryllotalpa vulgaris Latr. Moni- 

 tore Zoologico Italiano, Anno 22. 



VoiNOV, D. 1914 Recherches sur la spermatogenese du Gryllotalpa vulgaris 

 Latr. Archives de Zool. Exp., T. 54. 



Wenrich, D. H. 1916 The spermatogenesis of Phrynotettix magnus with 

 special reference to synapsis an|d the individuality of the chromo- 

 somes. Bull. Mus. Comp. Zool. Harvard, vol. 40. 



1917 Synapsis an>d chromosome organization in Chorthippus (Steno- 

 bothrus) curtipennis and Trimerotropis suffusa. Jour. Morph., vol. 

 29. 



WooLSEY, Carrie E. 1915 Linkage of chromosomes correlated with reduction 

 in numbers among the species of a genus, also within a species of the 

 Locustidae. Biol. Bull., vol. 28. 



B. Articles cited on other than Orthopteran material 



Della Valle. Paolo 1909 L'orgajnizzazione della chromatina studiata 

 mediante il numero dei Chromosomi — Archivio Zoologico, vol. 4. 

 1911 La continuita della forme di divisione nucleare ed il valors 

 morphologico dei chromosomi. Archivio Zoologico, vol. 5. 



JOURNAL OF MORPHOLOGY, VOL. 29, NO. 2 



