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PROCEEDINGS OF THE NATIONAL MUSEUM. 



the first four pairs fold over the ventral side, meeting in the median 

 line. These branches are all large and of nearly e({ual size and thickly 

 tuberculate, the first two pairs being somewhat larger than the hi.st 

 two pairs. The outer branches of the first four pairs and the fifth 

 pair of pleopoda consist of narrow, elongated appendages crenulated 

 on their outer margins and thickly tuberculate. The appendages of 



the sixth abdominal segment, the uropoda, are a pair of simple, cylin- 

 drical, elongated lobes, recurved at their extremities, and not reach- 

 ing beyond the mass of epimeral appendages. 



The incubatory pouch is formed of five pairs of lamella3, five issuing 

 from one side and five from the other. The first pair are much smaller 

 than the others, and are entirely concealed ])y the second pair. 



