Journal of experimental zoology . Fig. 38 Pseudemys troosti; frequency distribution of head-lengths of 501spermatozoa from a single testis. ValueinM Frequency 4 11 33 129 92 129 48 30 6 6 1 5 2 2 3 0. CSCnCOOOOO—-— — —C^C^i^ Fig. 39 Pseudemys troosti; frequency distribution of head-lengths ofspermatozoa from the same testis as the one in figure 38. Value inn Frequency 1 0 1 2 2 7 15 59 47 37 39 44
Journal of experimental zoology . Fig. 38 Pseudemys troosti; frequency distribution of head-lengths of 501spermatozoa from a single testis. ValueinM Frequency 4 11 33 129 92 129 48 30 6 6 1 5 2 2 3 0. CSCnCOOOOO—-— — —C^C^i^ Fig. 39 Pseudemys troosti; frequency distribution of head-lengths ofspermatozoa from the same testis as the one in figure 38. Value inn Frequency 1 0 1 2 2 7 15 59 47 37 39 44 19 23 41 35 46 28 86533 2543 2 230 SIZE DIMORPHISM IN SPERMATOZOA 231 13. Ovis aries (a) Spermatogenesis evidence concerning dimorphism. Ac-cording to H. E. Jordan (13) an X chromosome is present. (6) Material and method. Material obtained at Chicago,IlHnois, July, 1913; motile; killed in Gilsons mercm-o-nitricfluid; diagram of sperm-head in figure 10 o; measurements areto tenths of ocular division, one division being equal to (c) Data. Figure 40 gives the distribution for 498 spermatozoaplotted by classes of two-tenths of an ocular division. Thedistribution is bimodal with modes at ^1 and ^1, givinga
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
