NO. 1701. 



XORTHWEST PACIFIC ISOPODS—RICHARDt^OX. 



109 



PENTIDOTEA WOSNESENSKII (Brandt). 



Iclotca loosncscnskii Brandt, in Micldeuclorff'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. — Mip:rs, 

 Journ. Linu. Soc. London, vol. IG, 1883, p. 40. — Richardson, Proc. U. S. 

 Nat. Mus., vol. 21, 189U, 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. 

 U. S. Bureau of Fisheries, 1905, p. 216. 



Idotca hirtipcs Dana, U. S. Expl. Exp., Crust., vol. 14, 1853, p. 704, pi. 46, fig. 6. 



Idotea orcgonensis Dana, Proc. Acad. Nat. Sci. Phila., vol. 7, 1854, p. 175. 



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

 in British Columbia, vol. 2, 1866, p. 282. 



Pentidotea wosnescnskii Richardson, Bull. U. S. Nat. 

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



Localities. — Agattti Island ; Union Bay, Bayne 

 Sound, British Columbia ; Unalaska ; Attu Is- 

 lands; Xazan Bay, Atka. 



Depth. — Shore. 



PENTIDOTEA WHITEI (Stimpson). 



Idotca wJiitci Stimpson, Proc. Acad. Nat. Sci. Phila.. 

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

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

 vol. 21, 1899, pp. 846-847; Ann. Mag. Nat. Hist. (7), 

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

 p. 227. 



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

 No. 54, 1905. pp. 373-374. 



Locality. — Xazan Bay, Atka. 



PENTIDOTEA ROTUNDATA, new species. 



Body narrow, elongate, about five and a half 



Fig. 30. — Pentidotea 

 eotundata. x 2. 

 (Drawn by Miss V. 

 Dandridge.) 



Front excavate. 



times longer than wide (6|^ mm. : 35^ mm.). Sur- 

 face smooth, color light green, with markings 

 and dots of a darker green. 



Head a little wider than long (4 mm.: 5 mm.), 

 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 antenna have the basal 

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

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

 article of the peduncle of the second antenna^. 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 1^ mm. long; the fourth article is a little longer than the 



