FISHERY BULLETIN: VOL. 74, NO. 2 



120 r- 



100 



>- 

 o 



3 

 O 



a: 



80 



60 



40 



20 



±1. 



Th^ I 



5 10 15 20 



TOTAL CORPORA (number] 



25 



30 



Figure 27. — Frequency distribution of corpora count in 1,131 

 females ofStenella attenuata. 



connective tissue, 3.5 to 15.5 mm in diameter, av- 

 erage 7 mm. These corpora almost certainly are 

 nearly all regressed corpora lutea. Four hundred 

 fifty-six were encountered (13.29f ). Females w^ith 

 two or more corpora have, on the average, about 

 one Type 1 corpus (Figure 28), although as many 

 as five may be present (Table 3). 



Table 3. — Types of corpora present in ovaries ofS. attenuata in 

 relation to total corpora. Averages in Figure 28. 



Type 2. Surface raised and wrinkled. Interior 

 white to yellow, often v^dth traces of luteal cortex 

 and vascularization. Center solid or loosely con- 

 structed, consisting mainly of white connective 

 tissue. Definitely less integrated in structure 

 than Type 1 (above). Diameter 3.0 to 12.0 mm, 

 average 6 mm. The evidence on accumulation 

 rate (below) suggests that these corpora are prob- 

 ably a mixture of regressed corpora lutea and 

 corpora of ovulation. We found 787 of this type 

 (22.5%). The number of Type 2 corpora is rela- 

 tively constant in females with three or more cor- 

 pora, at about one and one-half (Figure 28) vdth a 



^ 12 



c 

 <v 

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Q. 



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Z) 

 Q. 



tr 

 o 

 o 



z 

 o 



I- 

 cr 

 o 



Q. 



o 

 cr 

 a. 







2 3 4 5 6 7 8 9 10 I I 12 13 14 15 16 17 '27 

 TOTAL CORPORA (number) 



Figure 28. — Relationships between numbers of corpora of various types and total number of corpora i 

 ovaries of females of Stenella attenuata. Ranges and sample sizes in Table 4. 



254 



