NO. 1701. NORTHWEST PACIFIC WOPOD^—RICIIARDHOy. 125 



Attached to one of the legs of /^ga symmetrica Richardson was a 

 parasite, the outline of which was more or less irregularly trans- 

 versely oval, with no traces of segmentation on the dorsal surface. 

 The body seems to be converted into a sac for carrying the eggs. 



Fig. 49.— Isopod parasite. Duu- ku;. 50.— Isopod parasite. Vbn- 



SAL VIEW. X 14i. TRAL VIEW. X 14*. 



which fill the lateral portions and can be seen through the thin, 

 almost transparent integmnent. On the ventral side at the anterior 

 end is the oral oj^ening, below which are the lamellse which bound 

 the opening into the marsupial cavity. Below these lamellae are two 

 small oval lamella;, one on either side. 



The specimen shown in figs. 49 and 50 is Cat. No, 39524, U.S.N.M. 



ONISCOIDEA. 

 Family LIGYDID^E. 

 Genus LIGYDA Rafinesque. 



LIGYDA PALLASII (Brandt). 



L'xoUi paUasii Brandt, Bull. Soc. Imper. des Natur. de Moscou, vol. 6, 1833, 

 p. 172. 



Liffia dilatata Stimpson, Bost. Jour. Nat. Hist, vol. 6, 1857, p. 507, pi. 22, 

 fig. 8. — Smith, Report Progress Geol. Survey of Canada, 1880, p. 218. — Under- 

 wood, Bull. 111. State Lab. Nat. Hist, vol. 2, 1886, p. 361. 



Ligia septentrionalis Lockington, Proc. Cal. Acad. Sci., vol. 7, 1877, pt 1, p. 46. 



Ligia stinipsoni Miers, Proc. Zool. Soc. London, 1877, p. 671 (footnote). 



Ligia ixilldsii Budde-Lund, Crust Isop. Terrestria, 1885. pp. 2G1-262. — Richard- 

 son, Proc. U. S. Nat Mus., vol. 21, 1899. p. 866; Ann Mag. Nat Hist (7), vol. 

 4, 1899, p. 334; American Naturalist, vol. 34, 1900, p. 306; Harriman Alaska 

 Expedition, Crust, vol. 10, 1904, p. 226; Proc. U. S. Nat Mus., vol. 27, 1904, 

 p. 670. 



Ligyda pallasii Richardson, Bull. U. S. Nat. Mus., No. 54, 1905, pp. 682-684. 



Localities. — Attn Island; Xazan Bay, Atka. 

 Depth. — Shore. 



LIGYDA EXOTICA (Roux). 



Ligia exotica Roux. Crust Medit., 1828, p. P,, pi. 13. fig. 9. — Budde-Lund. Crust. 

 Isop. Terrestria, 1885, pp. 266-268.— Richardson, Proc. U. S. Nat. Mus., 

 vol. 21, 1899, p. 866; Ann. Mag. Nat Hist. (7), vol. 4, 1899, p. 335; American 

 Naturalist, vol. 34, 1900, p. 306; Proc. U. S. Nat. Mus., vol. 23, 1901, p. 575. 



