FISHERY BULLETIN: VOL. 78, NO. 2 



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Figure 6. — Endometrium of animal in Figures 4 and 5, surface at right. Infiltration of stroma with macrophages; sparse glands; 

 hyalinization of stroma and larger vessel walls at H (hematoxylin and eosin x 120). 



Group III, Early Pregnancy 



There were 12 S. longirostris in this group 

 measuring from 166 to 188 cm in length (Table 4). 

 With the exception of the first specimen listed, the 

 left uterine horn was the larger. In this excep- 

 tional animal, the corpus luteum was also on the 

 right and no corpus albicans was found in the left 

 side. Uterine size and weight did not correlate well 

 with embryonic size (1-53 mm) or weight (1-5 g). 

 The embryos had been removed previously and 

 their placentas had apparently not yet implanted. 



The larger (pregnant) horn had a congested en- 

 dometrium and distended lumen (Figure 8). 



This is an important control group for the ex- 

 perimental Group VI whose uteri were empty de- 

 spite the presence of a corpus luteum. Thus, it is 

 noteworthy that even in small embryos (Figure 9) 

 the placental membranes are of appreciable size 

 and they grow rapidly (Figure 10) so that they are 

 not easily overlooked in dissections. Early limb 

 bud development could be recognized in embryos 

 sized 5 mm or more. 



512 



