366 



BULLETIN o4, UNITED STATES NATIONAL MUSEUM. 



396.— IDOTHEA OfH- 

 OTENSIS. 



as the basal part. 



IDOTHEA OCHOTENSIS Brandt. 



Idotea orlioti'usi^ Brandt, Middendorff' s Sibirische Reise, II, 1851, Crust., p. 

 145, pi. VI, fig. 38.— MiERS, Jour. Linn. Soc. London, XVI, 1883, p. 32, pi. i, 

 figs. 8-10.— Richardson, Proc. U. S. Nat. Mus., 

 XXI, 1899, p. 846; Ann. Mag. Nat. Hist. (7), IV, 

 1899, p. 265; American Naturalist, XXXIV, 1900, p. 

 227; Harriman Alaska Expedition, Crust., X, 1904, 

 p. 219; Proc. U. S. Nat. Mus., XXVII, 1904, p. 663; 

 Bull. U. S. Fish Comm., 1905, p. 216. 



Localities.. — Awaatsch Ba}^ Sea of Ochotsk; 

 noi'thwest coast of North America to Vancouver 

 Ishind; Lands End and Fort Point, California; 

 Humboldt Bay on Popof Island; Karta Bay; Port 

 Renfrew, British Columbia (J. Lindahl). 

 From mouth of sculpin; in sand. 

 Depth. — Surf ace; beach; low water; 7-18 fathoms. 

 Body oblong-ovate, al)oat three and a half times 

 longer than wide, 12 mm.: 42 muL Sides of thorax 

 nearly parallel; abdomen tapering slightly, the 

 posterior extremity being about four-tifths as wide 

 Length of abdomen a])out two-tifths the entire 

 length of body, If) mm. :42 mm. 



Head a little wider than long, with the anterior margin sinuate. On 

 either side of a median excavation is another very slight jexcavation. 

 The posterior portion of the head is not wider than the anterior por- 

 tion. The eyes are small, trans- 

 versely ovate, compound, and situ- 

 ated on the extreme lateral margin 

 about the middle of the head. The 

 first pair of antennae have the basal 

 article very much dilated; it is 

 longer and about twice as wide as 

 any of the following articles. The 

 first antennae reach almost to the 

 end of the second article of the pe- 

 duncle of the second pair of anten- 

 uiv. The basal article of the sec- 

 ond pair of ;intenn{\> is almost in- 

 conspicuous from a dorsal view. 

 The second and third articles are 

 a))Out equal in length. The last 

 two articles are al)()ut one and a half times longer than the third article 

 and are subequal. The tlagel luni consists of about eleven short articles. 

 The second antenna' when retracted reach only to the middle of the 

 third thoracic segment. The maxillipeds have a palp of four articles. 

 The first segment of the thorax is wider than the head, and produced 



Fit;. 397 



FED. 



iDOTHEA OCHOTENSIS. O, MaXII.LI- 



15^. h. First antenna. >: \h\. 



