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retracted is incom- 

 plete. Basal article 

 of outer antennae 

 wide, short, and not 

 spinulous; a notch 

 separates it from 

 lower border of cara- 

 pace. The carapace 

 is very swollen, es- 

 pecially in the car- 

 diac region, which is 

 markedly promi- 

 nent. Postorbital 

 portion wide; gastric 

 region high; bran- 

 chial regions ellipti- 

 cal, bearing on each 

 side two subacute 

 prominences direct- 

 ed outward ; the first 

 stronger than the 

 second. Subhepatic 

 region deeply groov- 

 ed. Chelipeds of 

 male very small and 

 smooth. First pair 

 of ambulatory legs 

 longer and stronger 

 than the others ; fifth 

 very small. Merus 

 of all the legs very 

 wide, having above 

 a thin, straight crest 

 and below a lamellar 

 prolongation with a 

 crenulate and arcu- 

 ate border; other 

 joints of legs small. 

 Abdomen of both 

 sexes with seven free 

 segments, the last 

 elongate in the male. 

 Measurements. — 

 Female (19724), 

 length of carapace 

 7.6, width of same 

 6 mm. 



