F. A. E. Crew 



153 



The left gonad was " for the most part made up of the polygonal 

 pigment cells which occur normally in the frog's ovary, with, however, 

 patches of normal testis at its poles. The anterior pole consists of testis 

 with a thin zone of the pigment cells invading one side, whilst the 

 posterior pole is somewhat over half testis. The remainder of the gland 

 is occupied by the pigment cells alone. Further a horizontal section 

 through the middle of the gland of this side, exposed five circular spaces 

 in the pigment mass, containing, surrounded by fibrous capsules, 

 spherical masses of lightly pigmented granular matter. Three out of the 

 five completely filled their respective spaces — the other two did not, one 

 of the latter also containing a large vacuole. The significance of these 

 bodies, which may be free or lie indiscriminately among the pigment 

 cells, and of the abnormally developed pigment mass, is, of course, on 

 the available data, impossible to determine. The former may plausibly 

 be looked upon as disintegrated ova (undergoing resorption)— the latter 

 as preceding the development of ova and the formation of a true ovo- 

 testis." 



Fig. 15. 



Fig. 16. 

 Killed January. Secondary 



17. Kent. R. temporaria. Adult 

 sexual characters typically male. 



Right gonad. An ovo-testis consisting of an inner lestis-portion 

 divided by a well-defined transverse constriction into anterior and 



