XANTHO TUBERCULATA. 



359 



DEC A POD A. CANCERIDM. 



BRACHYURA. 



Xantho tuberculata, R. Q. Couch, m. s. 



Specific Character. Carapace slightly depressed anteriorly ; latero-anterior 

 margin with four triangular teeth ; hands and wrists tuberculated, rugose ; ringers 

 nearly black, the rnoveable one with three grooves ; third joint of the ambulatory 

 legs denticulated on the upper edge. 



THE carapace is slightly depressed anteriorly, more so 

 than in X. rivulosa, but somewhat less than in X. florida. 

 The rostrum slightly waved, minutely ernarginate ; the 

 anterior portion of the carapace somewhat rugose ; the 

 regional lines of demarcation sharp and distinct, the eleva- 

 tions slight and flattened ; the latero- anterior margin with 

 four triangular teeth. The anterior pair of feet robust, 

 nearly equal ; the hands and wrists somewhat trans- 

 versely tuberculated and rugose ; the wrist with two dis- 

 tinct tubercles anteriorly ; the moveable finger has three 

 grooves, one on the inner and two on the outer side. The 

 whole of the ambulatory feet have the fourth, fifth, and 

 sixth joints hairy, with longer cilia on the edges ; the third 

 joint distinctly denticulated along the upper margin, with 

 a hairy patch beneath. 



