MAIOIDEA. 107 



Length of carapax (including beak, as usual), one and seven- 

 twelfths inches; of beak, five and one-third lines; breadth between 

 the orbits, four lines; greatest breadth of carapax, ten lines; first pair 

 of legs, a little longer than carapax ; posterior pair, one and one-third 

 the carapax; second pair over one and a half times carapax. The 

 hand is compressed, and the upper edge is obtuse, with hairs in minute 

 tufts. The fifth joint of eight posterior legs is closely covered with 

 very short hairs, besides tufts of hairs a little longer and divergent ; 

 tarsus rather longer than half the preceding joint. The horns of the 

 beak have hairs or setse above in a longitudinal range. The pedicel of 

 the eyes has a small prominence on anterior side. The immoveable 

 basal joint of outer antennae has the outer anterior angle rounded and 

 spinulous. The septum between the inner antennae is elongated, 

 spine-like. 



Oregonia gracilis, DANA, Sill. Am. J. Sci., 2d Ser., xi. 270. 



OREGONIA HIETA. 



Carapax pedesque sparsim hirti, rostro tenui, breviore quam latitudo 

 inter-orbitalis. Pedes paulo breviares, digito pedis antici intus deque 

 denticulate. Abdomen maris subellipticum, apice tran&versim triangu- 

 latum, feminoe fere orbiculatum. 



Carapax and feet sparsely rough hairy, beak slender, shorter than 

 inter-orbital space. Feet rather shorter than in preceding species. 

 Finger of anterior feet with inner edge evenly denticulate and no 

 prominent tooth. Abdomen of male subelliptical, at apex trans- 

 versely triangular; of female, nearly orbicular. 



Plate 3, fig. 3 a, front of carapax, natural size ; b, abdomen, enlarged 

 two diameters. 



Puget's Sound, C. Pickering. 



This species is near the preceding, but has a more rough hairy look, 

 is less slender and shorter in its beak, with a different abdomen. 



Oregonia hirta, DANA, Silliman's Am. J. Sci., 2d Ser., xi. 270. 



