FISHERY BULLETIN: VOL. 74, NO. 2 



side of the curve would be steeper and the right 

 side less steep. 



Consideration of the relative rates of deposition 

 of corpora in the left and right ovaries is impor- 

 tant to the question of persistence of corpora. The 

 distribution of corpora between left and right 

 ovaries is related to the number of corpora pres- 

 ent (Table 4). The first corpus occurs in the left 

 ovary about 94% of the time. Subsequent corpora 

 occur in the same ovary as preceding ones at 

 about the same rate (—95% ), causing a gradually 

 increasing percentage of animals with corpora in 

 both ovaries, until about 10 to 11 corpora have 

 been deposited, when emphasis switches sharply 

 to the opposite ovary (left or right). All females 

 with 15 or more corpora (27 specimens) had cor- 

 pora in both ovaries. 



A group of 15 seemingly postreproductive 



Table 4. — Location of corpora (corpora lutea and corpora 

 albicantia) in ovaries of 488 specimens of Stenella attenuata. 



females was encountered. These specimens had 

 very small, obviously regressed ovaries with 10 

 to 15 Type 3 or smaller corpora albicantia (Figure 

 30). They had no corpora lutea or Type 1 corpora 



I 2 3 4 5 6 7 8 9 10 1 1 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 



CORPORA (number) 



Figure 30. — Scatterplot of ovaries weight on number of corpora in Stenella attenuata. Females with corpus luteum not included. 



Open dots are females with no Type 1 or 2 corpora albicantia. 



256 



