BENIRSCHKE ET AL.; OVULATION IN DOLPHINS 



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Figure 22. — Endometrium of presumably delivered Stenella attenuata whose ovary had a fresh corpus luteum. Endometrial cavity top 

 left, hyalinized stroma (HyS) beneath surface epithelium and secretory glands (SG) beneath this layer (no. 20, Table 7; hematoxylin and 

 eosin x 100). 



marked discrepancy of the uterine horns (29 cm 

 left; 18 cm right). 



GROUP VIb.— These 15 animals (US. lon- 

 girostris; 4 S. attenuata) were found to be non- 

 pregnant but had well-established corpora lutea 

 with completely organized cavities, the luteal cells 

 appeared well supported (Table 8). Their lengths 



varied from 169 to 198 cm and uterine weights 

 were between 110 and 580 g. One of these speci- 

 mens had not been opened, was carefully dissected 

 by us, and found to be nonpregnant. Again, most 

 (12) were from February catches, many uteri had 

 stretch marks from former pregnancy, and in two 

 ovaries the corpus luteum was found on the right. 

 The secretory endometrium of almost all these 



Table 8. — Group VIb: Experimental group with well-supported corpora lutea. Specimen no. 1-11 Stenella longirostris; no. 12-15 



S. attenuata. 



523 



