XII 



SEX ORGANS THE OVARIES 



The rudiments of the ovaries, in the newly hatched larva consist 

 of two elongate masses of cells, situated close to the dorsal sur- 

 face of the mid-intestine, near the mid-line, and extend through 

 the seventh to the ninth trunk segments inclusive. In their gen- 

 eral form the ovarian rudiments are elongate fusiform, compress- 

 ed in a direction at right angles to the surface of the larva (Figs. 

 XV, 85, Ov), and are about twice or three times as wide as thick. 

 The contour of the rudiments is however actually irregular, as the 

 figure shows. In transverse section the outline of the ovarian 

 rudiments is, generally speaking, that of an elongate ellipse (Fig. 

 85, Ov). Six to ten rows of nuclei are included in the long axis 

 of the ellipse, in its short axis not more than two rows, and fre- 

 quently only one. A somewhat irregular layer of flattened cells 

 surrounds the ovarian rudiment, and constitutes the rudiment of 



FIG. 85. Dorsal part of a transverse section through the posterior half 

 of the eighth trunk segment of a newly hatched larva (Stage XV), inter- 

 secting the ovaries (Ov), x 567. 



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