Journal of experimental zoology . ifi tfi lii lO ^n Fig. 40 Ovis aries; frequency distribution of head-lengths of 498 spermatozoafrom a single testis. Valueinp Frequency 1 5 12 57 28 13 83. Fig. 41 Bos taurus; frequency distribution of head-lengths of 60G spermatozoafrom a single testis. • Value inn Frequency 1 0 1 0 2 2 14 33 39 51 8 33 58 78 64 62 69 62 35 27 4 1 2

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Journal of experimental zoology . ifi tfi lii lO ^n Fig. 40 Ovis aries; frequency distribution of head-lengths of 498 spermatozoafrom a single testis. Valueinp Frequency 1 5 12 57 28 13 83. Fig. 41 Bos taurus; frequency distribution of head-lengths of 60G spermatozoafrom a single testis. • Value inn Frequency 1 0 1 0 2 2 14 33 39 51 8 33 58 78 64 62 69 62 35 27 4 1 2 1 SIZE DIMORPHISM IN SPERMATOZOA 233

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904