PLATE XXXI. 



AURELIA FLAVIDULA (p. 5). 



Fro. 1. Photograph of a cast in plaster of the under surface of a large specimen of Aurelia 

 flavidula. The specimen had been kept in sea water that contained 3 per cent of forma- 

 line. It was plump and firm, but the surface contracted and gave the wrinkled appearance 

 shown in the cast. The impressions of the genital sacs are shown, but the casts of the 

 interior of the sacs are all broken away. The arms are imperfectly shown, as the plaster 

 forced itself between them and the body of the medusa. 



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