64 Crustacea and Echinodermata of the 



oblong joints. Internal antennas 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. 



Idotsea Wosnessenskii, Brandt; Sibirische Reise, ZoOl. i. 146. 



Idotsea hirtipes, Dana ; U. 8- Exploring Expedition, Crust, ii. 704. PI. XLVI. 



f. 6. 

 Idotsea Orcgonensis, 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. 



Hub. 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. 



IDoi.ka med s C ." Dana. ' u "0^7tC^j&H>q/Je^ m 



IdotiBa media, Dana; Proc. Acad. Xat. Sci. Philad. vii. 175. 



Differs from the preceding species in having a compara- 

 tively longer abdomen. 



Hub. California, (Le Conte) 

 Mus. of Prof. Dana. 



IDOT.K A RESECATA. Sti?)ipSOtl. 



PI. XXII. f. 7. 



Idotsea resocata, Stimpson; Proc. Bust. Soc. Nat. Hist. vi. 88. 



Body slender, convex along the middle above ; thorax 

 fiat or even concave below. Greatest breadth at the sixth 



