Journal of experimental zoology . Fig. 33 Melanoplus differentialis; frequency distribution of head-lengths of1008 spermatozoa from same left testis as the ones in figures 32 and 34. Value in ti Frequency 1 3 1 3 2 6 11 17 7 11 16 41 46 48 50 70 77 77 88 67 93 92 58 41 29 20 15 10 2 0 3 3 224 SIZE DIMORPHISM IN SPERMATOZOA 225 distribution* is not that of a simple variation curve and un-doubtedly several factors are involved in size det
Journal of experimental zoology . Fig. 33 Melanoplus differentialis; frequency distribution of head-lengths of1008 spermatozoa from same left testis as the ones in figures 32 and 34. Value in ti Frequency 1 3 1 3 2 6 11 17 7 11 16 41 46 48 50 70 77 77 88 67 93 92 58 41 29 20 15 10 2 0 3 3 224 SIZE DIMORPHISM IN SPERMATOZOA 225 distribution* is not that of a simple variation curve and un-doubtedly several factors are involved in size three curves however show distinctly a tendency to a majorbimodal subdivision. The minor modes may be due to inequali-ties in pairs of chromosomes that have no relation to the X chro-mosome or of course they may be due to any one or more of thesources of error mentioned on pages 196 to Fig. 34 ^Nlelanoplus differentialis; frequency distribution of head-lengthsof 734 spermatozoa from same left testis as the ones in figures 32 and 33. Value in /i Frequency 1 2 3 2 2 2 6 7 12 21 21 24 25 34 29 44 53 62 57 59 96,5 73 51 38 26 41 17 19 7 7 2 9. Gryllus abhreviatus (a) Spermatogenesis evidence concerning dimorphism. Thechromosomal relations for this species are not known. Anotherspecies of the same genus, G. domesticus, has an X chromosome,according to W. J. Baumgartner (05). (6) Material and method. Obtained at Douglas Lake, Michi-gan, August 23, 1913; motile in Ringers solution; killed inosmic fumes; diagram of sperm-head in figure 10 c; measure- 226 CHARLES ZELENY AND E. C. FAUST ments were to halves of ocular divisions, one division being equalto (c) Data. Figure 35; 552 spermatozoa from the right testis. (d) Con
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
