CYTOPLASMIC INCLUSIONS OF THE GERM-CELLS. 459 
12. Paulmier. — ‘ Journ. Morph..’ xv. 
13. Dederer. — I bid., xxvi. 
14. Yon Divaz. — ‘ Zool. Anzeig..’ 1914-1915. 
15. Pantel et Sinety. — ‘ La Cellule,’ t. 23, 1906. 
16. Goldschmidt. — “ The Function of the Apyrene Spermatozoa,” 
‘Science,’ Friday, October 13th, 1916. 
EXPLANATION OF PLATES 23 ^nd 24, 
Illustrating Mr. J. Bronte Gatenby’s paper on “The Cyto- 
plasmic Inclusions of the Germ-Cells.” 
Explanation of Lettering. 
(For x see text.) 
A.B. Acroblast. A.S. Acrosome. A.F. Axial filament. C 1 . Proximal 
centrosome. C 2 . Distal centrosome. C.O. Chromophobe zone of macro- 
mitosome. C.P. Cell process. C.D.P. Central darker part of spindle 
bridge. E.P. Equatorial plate granules. F. Filament. G. Excretory 
granule. I.B.M.D. Interconnecting bridge of mitochondrial grains. 
I.P. Intercellular part of spindle bridge. L.M.D. Mitochondrium 
elongated by pressure. M. Micromitosome. M.D. Mitochondria. 
M.D.X. Mitochondria without well-marked chromophobe medulla. 
M.D.Y. Mitochondria with chromophobe medulla well marked. 
P.B. Protoplasmic part of terminal body of flagellum. S.B. Spindle 
bridge. S.P. Macromitosomal spireme. T.B. Terminal body of axial 
filament. V. Chromophobe part of large mitochondrium formed by 
coalescence of several individual bodies. X.G. and X.M. Excretory 
grains (?). 
PLATE 23 (Smerinthus populi). 
With the exception of fig. 3, all figures drawn from material pre- 
served in Champy and stained in iron hsematoxylin. Drawn with camera 
lucida, at table level, with T ^th oil immersion lens by Koristka and 
12 compensating eyepiece. Magnification now 2250. 
Fig. 1. — Primary spermatogonium showing mitochondria (M.D.) 
applied to nuclear membrane. The centrosome, and what is probably 
the micromitosome (M.), lie near. 
