172 RATHBUN 
horns slender, divergent, their outer margins almost longitudinal, their 
length along the inner margin about one eighth of the entire length of 
the carapace. Supraocular eave extending laterally not quite so far as 
in O. gracilis, Postocular spine narrow, as in O. gracilis, and directed 
a little more forward than in that species. The interantennular spine is 
curved a little more forward than in O. gracilis. Eyes a little stouter than 
in that species. Basal segment of antenna armed along its outer margin 
with one stout blunt subterminal spine and three small spines, one of which 
is at the anterior angle, and along its inner margin with one or two 
tubercles. Outer maxillipeds asin O. gracilis. Lower surface pubescent. 
Chelipeds of the female of moderate size, one and a half times as long 
as carapace, subequal, shaped much as in O. gracilis. Inner surface of 
merus bordered by short blunt spines. Propodus slightly longer than 
merus, fingers and palm subequal, margins of palm subparallel, fingers 
fitting close together, denticulate. Ambulatory legs slender, diminishing 
gradually in length from the first to the fourth pair, the third pair being 
the length of the female cheliped. The dactyli are contained about one 
and a third times in their propodi. Chelipeds and ambulatory legs covered 
with long yellow hair, mixed with shorter and finer hair. 
Dimensions.—Length of carapace and rostrum 26.5 mm., width of 
carapace 19.6 mm., width between tips of postorbital spines 13 mm., 
length of horn measured along the inner edge 3.4 mm., distance between 
tips of horns 3.5 mm. 
Type locality.—North of Rat Islands, Aleutian Chain, 270 fathoms 
(Albatross station 3785), one adult female. 
This species, by reason of the character of its orbits, maxillipeds, and 
trunk-legs, falls into the genus Oregonia, but differs from O. gracilis in its 
spreading horns, greater anterior breadth, different ornamentation of the 
basal antennal segment, etc. 
Genus Dasygyius Rathbun. 
DASYGYIUS TUBERCULATUS (Lockington). 
Platex.fos.44.5 3a: 
Distribution.—From Alamitos Bay, Cali- 
fornia, to Panama Bay, including Gulf of 
California; 4 to 33 fathoms. 
A fine series of specimens of this species 
was collected in San Diego Bay, 6 fathoms, 
by the A/satross (station 3620); the largest 
Fic. 92. Dasygyius tuberculatus. §. Male measures 23 mm. long and 17.2 mm. 

Station 3030. @. Maxilliped, much en- ; 
larged. 4. Side view of carapace (x 13). wide. 
