704 CLARENCE L. TURNER 
6. During spermatogenesis the lobules are partitioned into 
cysts resembling those found in the testis of insects. 
7. There is no period of growth after the spermatogonia are 
formed. 
8. The diploid number of chromosomes is 27. 
9. The beginning of the period of spermatogenesis is con- 
temporaneous with the beginning of the seasonal reduction of 
the temperature of the water in which the perch is found. 
10. The expulsion of the spermatozoa occurs at the same time 
as the seasonal rise in the temperature of the water. The be- 
ginning of the sudden increase in the size of the testis is simul- 
taneous with the beginning of the seasonal drop in the tempera- 
ture of the water in which the perch is found. 
VII. BIBLIOGRAPHY 
ALLEN, Ezra 1916 Studies on cell division in the albino rat. Anat. Rec., 
vol. 10. 
Agar, W. E. 1911 The spermatogenesis of Lepidosiren. Quart. Journ. Mic. 
Sc., vol. 57. 
ALLEN, B. M. 1903 The embryonic development of the ovary and testis in 
mammalia. Biol. Bull., vol. 5. 
1905 The embryonic development of the rete-cords and sex cords in 
Chrysemys. Am. Jour. Anat., vol. 5. 
1906 The origin of the sex cells of Chrysemys. Anat. Anz., Bd. 29. 
1909 The origin of the sex cells of Amia and Lepidosteus. Anat. 
Rec., vol. 3. 
Barry, D. T. 1910 Morphology of the testis. Journ. Anat. and Physiol., 
vol. 44. 
Brarp, J. 1900 The morphological continuity of the germ cells in Raja batis. 
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1902a The germ cells of Pristiurus. Anat. Anz., Bd. 21. 
1902 b The numerical law of germ cells. Anat. Anz., Bd. 21. 
1902 c The germ cells. Part 1. Raja batis. Zool. Jahr., Bd. 16. 
BreMER, JOHN Lewis 1911 Morphology of the human testis and epididymis. 
Am. Journ. Anat., vol. 2. 
1911 Seminiferous tubules of man. Am. Journ. Anat., vol. 2. 
Bucuner, Paut 1910 Keimbahn und Ovogenese von Sagitta. Anat. Anz., 
Bd. 35. 
Dopps, Gipron S. 1910 Segregation of the germ cells of the teleost, Lophius. 
Journ. Morph., vol. 21. 
DuesBerG, J. 1917 Chondriosomes in fish embryos. Am. Journ. Anat., vol. 21. 
Dustin, A. P. 1907 Recherches sur l’origin des gonocytes ches les amphibiens. 
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