504 Stimpson on the Crustacea and Echinodermata 
oblong joints. Internal antenne 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, 04; 
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. 
IDOTEA WOSNESSENSRKII. Brandt. 
Idotæa Wosnessenskii, BRANDT; Sibirische Reise, Zodl. i. 146. 
EN hirtipes, Dana; U. S. Poem Expedition, mis ii. 704. Pl. XLVI. 
te 
Idotea 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 E 
(Cooper;) Upper California, (Wosnessenski, Le Conte 
San Francisco Bay, (Stimpson.) 
Mus. Acad. Petrop.; Paris; Expl. Exped. ; Smithsonian ; 
Phil. Acad. ; Bost. Soc. 
IDOTÆA MEDIA. Dana. 
Idotæa media, Dana; Proc. Acad. Nat. Sci. Philad. vii. 175. 
Differs from the preceding species in having a compara- 
tively longer abdomen. 
. California, (Le Conte.) 
Mus. of Prof. Dana. 
IDOTZA RESECATA. Stimpson. 
Fi, RADE 7. 
Idotza resecata, SrrwPsox; Proc. Bost. Soc. Nat. Hist. vi. 88. 
Body slender, convex along the middle above; thorax 
flat or even concave below. Greatest breadth at the sth 
