tyAQ CRUSTACEA. 



The antero-lateral region is without areolets, excepting a small oblique 

 areolet behind the orbit, not reaching towards the margin. The sur- 

 face from the front margin to the posterior part of 2 M is evenly 

 curved, without sulci dividing it into areolets. The hands are not 

 very unequal in size. 



Eriphia armata. 



Mediocriter crassa. Carapax antice transversim paulo ntgatus, margine 

 areolarum \M 2 Met bL antico per rugam granulosam transversam 

 conspiems, areola 2L + 3L circumscripta, spinosd; f route paulo de- 

 flexo, emarginato, denticidato, dent ic id is parr id is conicis ; regione 

 orbitali interna 1-%-spinoso, ejus margine exteruo 2-S-spinoso, margine 

 superno subtiliter denticidato ; margine antero-latcridi carapacis sub- 

 acute, 6-spinoso (spinis orbita? exel list's), sjtiui* acid is. Pedes antici 

 spinulis valde airmail et extus liirsuti, manu majore extus seriatim 

 spinulosd, infra lo3vi, digito ejus mobili cum dente magno obliquo 

 infra armato. Pedes postlci liirsuti. 



Moderately stout. Carapax anteriorly transversely corrugate, ante- 

 rior margin of areolets 1 M, 2 M and 5 L distinct through trans- 

 verse granulous rugae, areoler 2 L+3 L together circumscribed, 

 spinulous; front a little deflexed, emarginate, denticulate, teeth 

 small conical; inner orbital region one or two-spinous, its outer 

 margin two or three-spinous, upper margin finely denticulate; an- 

 tero-lateral margin of carapax subacute, hve-spinous spines of orbit 

 excluded, spines acute. Anterior feet armed with ^pinules, and 

 exteriorly hirsute, hand rather large, seriately spinulous on outer 

 surface, smooth below, the moveable finger having a large stout 

 basal tooth. Posterior feet hirsute. 



Plate 14, fig. 6 a, female, natural size ; b, front view (a little ob- 

 lique) of front; c, moveable finger of larger hand; d, abdomen of 

 female. 



Rio Negro, eastern coast of Patagonia. 



Length of carapax of female, nine and a half lines; greatest breadth, 

 thirteen and three-fourths lines; ratio of length to breadth, 1 : 145. 



