456 Stimpson on the Crustacea and Echinodermata 



Mus. Phil. Acad. 



Dr. Johnston used the name Othonia for a genus of An- 

 nelides in 1835, — prior to its application to the crustacean 

 group by Bell. But Johnston's genus seems to be the 

 same as Fabricia, Blainv. 1828. 



MITHRAX AEMATUS. 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 5 U. S. Exploring Expedition, Crust, i. 106, PI. III. f. 2. 



The Oregonice may be distinguished by the great length 

 of their legs, 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, PI. III. f. 3. 



This is more hairy than the preceding species, and has a 

 proportionally longer rostrum. Both are inhabitants of 

 deep water. 



Puget Sound, (Pickering.) 



Mus. Expl. Exped. 



PUGETTIA GRACILIS. Dana. 

 Pugettia gracilis, Dana : U. S. Exploring Expedition, Crust, i. 117, PI. IV. f. 3. 



The genus Pugettia is characterized by the large post- 

 orbital expansions of the depressed, unarmed carapax. Ros- 



