CANCROIDEA. ^53 



Cancer gracilis. 



Carapax nudus, partim minute gramdatus, valde convexus, non distincte 

 areolatus, superficie non undulatd, lateraliter triangulatus et acutus, 

 margine postero-laterali fere recto, antero-latemM 9-dentato, dentibus 

 regularibus, acutis, paido prominentibus, dente primo vix longiore 

 quam secundus, totis margine postero fere rectis et longis et sub- 

 tiliter denticidatis ; fronte inter-antennali tridentato. MaxUUpedes 

 externi pubescentes, articulo tertio apicem externum valde arcuato aut 

 rotundato, marginem apicalem et externum longh ciliato. Pedes antici 

 subcequi, manu subcristatd, crista 1-2-dentatd, superficie externd cos- 

 tatd. Pedes 8 postici nudi, tai*so longo, tenuissimo, nudo. 



Carapax nude, in part minutely granulate, much convex, not dis- 

 tinctly areolate, surface not undulate, laterally triangulate and 

 acute, postero-lateral margin nearly straight, antero-lateral nine- 

 toothed, teeth regular, acute, a little prominent, first tooth hardly 

 longer than second, all with the hinder side nearly straight, long 

 and minutely denticulate ; inter-antennary front three-toothed. Outer 

 maxillipeds pubescent, third joint at outer apex arcuate or rounded. 

 Apical and outer margin long ciliate. Anterior feet subequal; 

 hand subcristate, crest 1-2-dentate, outer margin costate. Eight 

 posterior feet nude, tarsus long, very slender and naked. 



Plate 7, fig. 2 a, male, natural size ; b, outer maxilliped ; c, outer 

 view of hand, natural size ; d, abdomen, natural size. 



San Francisco. 



Length of carapax, thirteen lines; greatest breadth, nineteen lines; 

 ratio, 1 : 1*46. This species is very similar to the large one from San 

 Francisco. But the different shape of the outer maxillipeds is suffi- 

 cient evidence of their difference of species. 



Cancer Edwardsii (Bell). 



Ophthalmic breadth nofc greater than medial region, outline in front 

 hardly projecting at all beyond line of orbits. 



39 



