Pacific Coast of North America. 265 



the excavation being deeper and wider in /. rectilineata than 

 in /. ochotensis ; in the shape of the first thoracic segment, 

 which in /. ochotensis is produced laterally and has the antero- 

 lateral angles truncate, while in /. rectilineata this segment is 

 not produced and has rounded antero-lateral angles ; in the 

 size of the epimera, which are much more slender in /. recti- 

 lineata than in /. ochotensis; and in the shape of the terminal 

 segment of the bodj, the posterior angle of which in /. ochot- 

 ensis is more acute, the line from the lateral angle to the 

 median angle being excavate, while in /. rectilineata this line 

 is straight and the median angle obtuse. 



41. Idotea Wosnesenskii, Brandt. 



Idotea Wosnesenskii, Brandt, MiddendorfTs Sibirisclie Reise, ii. 1851, 



Crust, p. 146 ; Stimpson, Bost. Journ. Nat. Hist. vi. 1857, p. 504 ; 



Speuce Bate, Lord's Naturalist in British Columbia, ii. 1866, p. 281 ; 



Miers, Jouru. Linn. Soc. London, Zool. xvi. 1883, p. 40. 

 Idutea /lirtipes, Dana, Cr. U.S. Expl. Exp. pt. ii. 1853, p. 704, pi. xlvi. 



fig. 6. 

 Idotea oregonensis, Dana, Proc. Acad. Nat. Sci. Pliilad. vii. 1854, p. 175. 

 Idotea media (Dana ?), Spence Bate, Lord's Naturalist in British 



Columbia, ii. 1866, p. 282. 



Hah. Sea of Ochotsk and Kamchatka Sea ; west coast of 

 North America to Monterey Bay, California. 



42. Idotea ochotensis *, Brandt. 



Idotea ochotensis, Brandt, Middendorff's Sibirische Reise, ii. 1851, Crust, 

 p. 145, pi. vi. fig. 33 ; Miers, Journ. Linn. Soc. London, Zool. xvi. 

 1883, p. 32, pi. 1. figs 8-10. 



Fig. 21. 



Idotea ochotensis, Brandt. 



* The following is quoted from Miers, Journ. Linn. Soc. London, Zool. 

 i. 1883, p. 63: — "Mr. Spence Bate (Lord's 'Naturalist in British 



