no. 1701. 



NORTHWEST PACIFIC ISOPODS— RICHARDSON. 



109 



PENTIDOTEA WOSNESENSKII (Brandt). 



Idotca toosncsenskii Brandt, in Midclenclorff's Sibirische Reise, vol. 2, 1851, 

 Crust., p. 146. — Stimpson, Bost. Jour. Nat. Hist., vol. 6, 1857, p. 504. — Spence 

 Bate, Lord's Naturalist in British Columbia, vol. 2, 18G6, p. 281. — Mieks, 

 Journ. Linn. Soc. London, vol. 1G, 1883, p. 40. — Richardson, Proc. U. S. 

 Nat. Mus., vol. 21, 1899, p. 840; Ann. Mag. Nat. Hist. (7), vol. 4, 1899, p. 265; 

 American Naturalist, vol. 34, 1900, p. 227; Harriman Alaska Expedition, 

 Crust., vol. 10, 1904, p. 218; Proc. U. S. Nat. Mus., vol. 27, 1904, p. 663; Bull. 

 TJ. S. Bureau of Fisheries, 1905, p. 21G. 



Idotea hirtipes Dana, TJ. S. Expl. Exp., Crust., vol. 14, 1853, p. 704, pi. 46, fig. 6. 



Idotea oregonensis Dana, Proc. Acad. Nat. Sci. Phila., vol. 7, 1S54, p. 175. 



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

 in British Columbia, vol. 2, 1S66, p. 282. 



Pentidot'ca wosnesenskii Richardson, Bull. U. S. Nat. 

 Mus., No. 54, 1905, pp. 370-373. 



Localities. — Agattu Island; Union Bay, Bayne 

 Sound, British Columbia; Unalaska; Attu Is- 

 lands; Nazan Bay, Atka. 



Depth. — Shore. 



PENTIDOTEA WHITEI (Stimpson). 



Idotea icliitei Stimpson, Proc. Acad. Nat. Sci. Phila., 

 1864, p. 155. — Miers, Journ. Linn. Soc. London, vol. 16, 

 1883, pp. 42-43.— Richardson, Proc. U. S. Nat. Mus, 

 vol. 21, 1899, pp. S46-847; Ann. Mag. Nat. Hist. (7), 

 vol. 4, 1899, p. 266 ; American Naturalist, vol. 34, 1900, 

 p. 227. 



Pentidotea whitei Richardson, Bull. U. S. Nat. Mus., 

 No. 54, 1005, pp. 373-374. 



Locality. — Nazan Bay, Atka. 



PENTIDOTEA ROTUNDATA, new species. 



Body narrow, elongate, about five and a half 

 times longer than wide (6J mm. : 35J mm.) . Sur- ^^^rT^Tt 

 face smooth, color light green, with markings (Drawn by Miss v. 

 and dots of a darker green. Dandridge.) 



Head a little w 7 ider than long (4 mm.: 5 mm.). Front excavate, 

 and the antero-lateral angles rounded. Eyes small, round, situated 

 on the lateral margins, close to the posterior margin, and scarcely 

 visible in a dorsal view. The first pair of antennae have the basal 

 article large and dilated, quadrate; the three following articles are 

 short and subequal. The first antennae extend to the end of the second 

 article of the peduncle of the second antennae. The first article of 

 the second antennae is extremely short and is scarcely visible in a 

 dorsal view; the second and third articles are about equal in length, 

 being each mm. long; the fourth article is a little longer than the 



