456 Stimpson on the Crustacea and Echinodermata 
Mus. Phil. Acad. 
Dr. Jounston used the name Othonia for a genus of An- 
-nelides in 1835,—prior to its application to the crustacean 
group by Bett. But Jouwsrow's genus seems to be the 
same as Fabricia, Buainv. 1828. 
MITHRAX ARMATUS. De Saussure. 
Mithrax armatus, De Saussure; Rev. et Mag. Zodl. v. 355, Pl. XIII. f. 1. 
Mazatlan, ( Verreaux.) 
Mus. Phil. Acad. 
OREGONIA GRACILIS. Dana. 
Oregonia gracilis, Dana ; U. S. Exploring Expedition, Crust. i. 106, PI. III f. 2 
The Oregonie may be distinguished by the great length 
of theirlegs, the penultimate joint of which is not expanded; 
and by the long, slender, post-orbital spine. The rostrum 
is slender, and forked nearly from its base ; in this species 
the horns are long, and diverge toward their extremities. 
Puget Sound, (Pickering.) 
Mus. Expl. Exped. 
OREGONIA HIRTA. Dana. 
Oregonia hirta, Dana; U. S. Expl. Exped., Crust. i. 107, Pl. IIL f. 9. 
a 
This is more hairy than the preceding species, and has of 
B 
proportionally longer rostrum. oth are inhabitants 
eep water. 
Puget Sound, (Pickering.) 
Mus. Expl. Exped. 
PUGETTIA GRACILIS, Dana. 
Pugettia gracilis, Daxa; U. S. Exploring Expedition, Crust. i, 117, PI. IV: £ % 
The genus Pugettia is characterized by the large p 
orbital expansions of the depressed, unarmed carapa% ^ 
