370 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



FIG. 401. PENTIDOTEA KESECATA. a, 

 MAXILLIPED. x 15}. 6, FIRST AN- 

 TENNA, x 15}. 



second and third articles are of equal length; the fourth is almost twice 

 as long as the third; the fifth is slightly shorter than the fourth. The 

 flagellum consists of twelve articles. The maxilliped has a palp of 

 five articles. 



The first and seventh segments of the thorax are equal in length and 

 shorter than an} 7 of the others. The third and fourth segments are 



the longest. The first segment is very 

 little wider than the head; the antero- 

 lateral angles are produced to surround 

 the posterior portion of the head. The 

 epimera of the second, third, and fourth 

 segments do not occupy the whole of the 

 lateral margin of the segment; those of 

 the second and third segments occupy the 

 anterior two-thirds, that of the fourth seg- 

 ment, the anterior three-fourths part; the 

 epimera of the three following segments 

 occupy the entire lateral margin. All the 

 epimera are large and conspicuous from a 

 dorsal view. 



The legs are similar in structure and fur- 

 nished with hairs on the inferior margin 

 of the merus, carpus, and propodus. The basis of all the legs is 

 provided with a carinate process. 



The abdomen has two short segments and one long one with lat- 

 eral sutures at the base. The posterior margin of the terminal seg- 

 ment is deeply excavate, the lateral angles being acute!} 7 produced. 

 The sides of the abdomen converge slightly from the base to about 

 the middle of the segment, and then converge again slightly at the 

 extremity. 



PENTIDOTEA WOSNESENSKII (Brandt). 



Idotea wosnesewkii BRANDT, Middendorff's Sibirische Reise, II, 1851, Crust., 

 p. 146. 



Idotea hirtipes DANA, U. S. Expl. Exp., Crust., XIV, 1853, p. 704, pi. XLVI, fig. 6. 



Idotea oregonensis DANA, Proc. Acad. Nat. Sci. Phila., VII, 1854, p. 175. 



Idotea wosnesenskii STIMPSON, Boat. Jour. Nat. Hist., VI, 1857, p. 504. SPENCE 

 BATE, Lord's Naturalist in British Columbia, II, 1866, p. 281. 



Idotea media (Dana?) SPENCE BATE, Lord's Naturalist in British Columbia, II, 

 1866, p. 282. 



Idotea wosnesenskii MIERS, Jour. Linn. Soc. London, XVI, 1883, p. 40. RICHARD- 

 SON, 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. 218; Proc. U. S. Nat. Mus., XXVII, 

 1904, p. 663; Bull. U. S. Commission of Fish and Fisheries, 1905, p. 216. 



Localities. Sea of Ochotsk and Kamchatka Sea; west coast of North 

 America to Monterey Bay, California; Dutch Harbor on Unalaska 

 Island; White Water Bay, Alaska; Humboldt Bay on Popolf Island; 



