2l8 RICHARDSON 



The abdomen consists of three distinct segments, with suture lines on 

 either side of another partly coalesced segment. The third or terminal 



FIG. 98. Idotea gractllima (Dana). Abdomen, showing variations in form. 



segment has subparallel sides to about the middle, where the segment 

 gradually becomes narrower to a truncate extremity. On the posterior 

 margin of the terminal segment is a faint indication of a double emargi- 

 nation on either side of an obtuse median point. 



Legs small and slender and devoid of hairs. 



The five small specimens and one large one agree in having the ter- 

 minal segment as described above. The two larger specimens show the 

 emargination more distinctly, one of the specimens more so than the 

 other. 



Figures showing all three variations are given. 



The specimens agree in all other characters. 



Dana's specimens were collected by Professor J. Le Conte on the coast 

 of California. 



IDOTEA WOSNESENSKII Brandt. 



Idotea wosnesenskii BRANDT, Middendorffs Sibirische Reise, II, Pt. I, Crust., 



p. 146, 1851. 

 Idotea hirtipes DANA, U. S. Expl. Exp., Crust., XIV, Pt. II, p. 704, pi. XLVI, 



fig. 6, 1853. 



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

 Idotea wosnesenskii STIMPSON, Bost. Jour. Nat. Hist., vi, p. 504, 1857. 

 Idotea wosnesenskii SPENCE BATE, Lord's Naturalist in British Columbia, II, 



p. 281, 1866. MIERS, Jour. Linn. Soc. London, xvi, p. 40, 1883. 



RICHARDSON, Proc. U. S. Nat. Mus., xxi, p. 846, 1899. 



Localities. Dutch Harbor on Unalaska Island; Humboldt Bay on 

 Popof Island ; Yakutat ; Glacier Bay ; Garforth Island in Muir Inlet, 

 and Sitka, Alaska (Harriman Expedition). Beaver Cove on Vancouver 

 Island (Harriman Expedition). Lands End, Calif. (Dr. Ritter and 

 party). 



