504 Stimpson on the Crustacea and Echinodermata 



oblong joints. Internal antennae reaching to the fourth 

 joint of the peduncle of the external ones. Feet slender, 

 slightly pilose, with rather long hairs ; their terminal joints 

 elongated. Color in one specimen opaque whitish ; in 

 another, reddish and brownish, mottled. Length, 0.4 ; 

 breadth, 0.18 inch. Taken on a sandy bottom in ten 

 fathoms, in the Bay of San Francisco near its entrance. 

 Mus. N. P. Expl. 



IDOT.EA WOSNESSENSKII. Brandt. 



Idotaea Wosnessenskii, Brandt; Sibirische Reise, Zool. i. 146. 



Idotaea hirtipes, Dana ; U. S. Exploring Expedition, Crust, ii. 704. PL XL VI. 



f. 6. 

 Idotaea Oregonensis, Dana ; Proc. Acad. Nat. Sci. Philad. 1854, vii. 175. 



An exceedingly common species, of a dark green color, 

 found among sea-weeds on rocky or stony shores between 

 high- water and half-tide marks. 



Hab. Atcha and Sitka, (Wosnessenski;) Puget Sound, 

 (Suckley,) " Oregon," (Expl. Exped. ;) Shoalwater Bay, 

 (Cooper;) Upper California, (Wosnessenski, Le Conte ;) 

 San Francisco Bay, (Stimpson.) 



Mus. Acad. Petrop. ; Paris ; Expl. Exped. ; Smithsonian ; 

 Phil. Acad. ; Bost. Soc. 



IDOT^A MEDIA. Dana. 

 Idotaea media, Dana; Proc. Acad. Nat. Sci. Philad. vii. 175. 



Differs from the preceding species in having a compara- 

 tively longer abdomen. 



Hab. California, (Le Conte.) 

 Mus. of Prof. Dana. 



IDOTiEA KESECATA. Stimpson. 

 PI. XXII. f. 7. 



Idotaea resecata, Stimpson ; Proc. Bost. Soc. Nat. Hist. vi. 88. 



Body slender, convex along the middle above ; thorax 

 flat or even concave below. Greatest breadth at the sixth 



