74 DESCRIPTION OF PIRATES. 



PLATE XV. 

 Aphro^hora quadrangular is. 



FIGS. 264-265. Second spermatocyte, telophase, showing chromatin nucleolus () 



and the products of division of the odd chromosome (x). 

 266. A spermatid containing the chromatin nucleolus (). 



267-268. Spermatids containing both the chromatin nucleolus (n) and the odd 

 chromosome (x), a the acrosome. 



269. Equatorial plate from a somatic cell of a male larva, 23 chromosomes. 



270. Equatorial plate of an oogonium, 24 chromosomes. 



271. Resting nucleus of a young oocyte before synapsis, showing two pairs 



of condensed chromosomes, corresponding in size to the z-chromo- 



somes and the odd chromosome of the spermatocytes. 

 272-277. Sections of nuclei of oocytes, showing one or more of these hetero- 



chromosomes, from safranin-gentian preparations. 

 278-279. Bouquet stage from iron-haematoxylin preparations, showing the 



heterochromosome bivalent (x). 



Caccecia cerasivorana (Lepidoptera). 



280. First spermatocyte, synizesis stage, showing 2 condensed chromo- 

 somes (x\ and x z ). 



281-282. First spermatocyte, synapsis stage. 

 283-284. First spermatocyte, growth stages. 



285. First spermatocyte, prophase. 



286-287. First spermatocyte, later prophases, showing the heterochromosome 

 pair (x). 



288. First spermatocyte, metaphase. 



289. Second spermatocyte, metaphase. 



290. First spermatocyte, equatorial plate. 

 291-292. Second spermatocyte, equatorial plates. 



Euvanessa antiopa (Lepidoptera). 

 293. First spermatocyte, equatorial plate. 



