Journal of experimental zoology . Pig. 16 Alydus pilosulus; frequency distribution of head-lengths of 429 sper-matozoa from right testis. Valueinju 6 19 46 94 86 106 51 16 5. cicocccocoeococo ?«^ lO »0 CO COCO C*3 CO CO CO Fig. 17 Alydus pilosulus; frequency distribution of head-lengths of 469 sper-matozoa from the same testis as the one in figure 16. ValueinM Frequency 3 2 15 17 47 39 63 71 68 55 49 24 16 SIZE DIMORP
Journal of experimental zoology . Pig. 16 Alydus pilosulus; frequency distribution of head-lengths of 429 sper-matozoa from right testis. Valueinju 6 19 46 94 86 106 51 16 5. cicocccocoeococo ?«^ lO »0 CO COCO C*3 CO CO CO Fig. 17 Alydus pilosulus; frequency distribution of head-lengths of 469 sper-matozoa from the same testis as the one in figure 16. ValueinM Frequency 3 2 15 17 47 39 63 71 68 55 49 24 16 SIZE DIMORPHISM IN SPERMATOZOA 211 The modes for the first set are and giving a ratioof : The modes for the second set are ^ and a ratio of : This is very close to the ratio, : , expected on the basis of complete fusion of chromo-somes and formation of spermatozoa all of which are of the sameshape. 4- Anasa tristis Size dimorphism in the spermatozoa has been described bythe junior author (Faust 13). The following account gives somenew measurements in addition to the old ones, and also adds thecalculations of the length ratio to be expected on the basis ofchromosomal history. (a) Spermatogenesis evidence concerning dimorphism
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
