866 I'liOCEEDIXGS OF THE NATIONAL MUSEUM. vol.xxi. 



34. LIGIA Fabrieius. 



ANALYTICAL KEY TO THE SPECIES OF LIGIA. 



a. External antcniiii- shorter than the hotly. 



b. Caudal .stylets ahout equal to half the length of body. 



82. Lifi'ia occideti talis Dana. 

 b'. Caudal stylets about equal to one-fifth the length of body. 



83. Litjia pallasii lirandt. 



a'. External autennjB longer than body, or equal to length of body. Caudal stylets 



about equal to two-thirds length of body 84. Hgia exotica Roux. 



82. LIGIA OCCIDENTALIS Dana. 



Ligia occidentalis Dana, U. S. Expl. Exp. Crust., II, p. 7 '2, pi. xlix, tig. 7; Proc. 

 Acad. Nat. Sci. Phila., VH, p. 176. — Stimpson, Bos. Journ. Nat, Hist., YI, 

 1857, p. 66.— Harfoud, Proc. Cal. Acad. Sci., VII, 1877, p. 116.— Budde- 

 LuND, Crust. Isop. Terrestria, 1885, p. 264. 



Habitat. — California: San Francisco Bay; San Diego; Sacramento 

 River; Monterey Bay; Lower California. 



83. LIGIA PALLASII Brandt. 



Lif/ia paUasii Bkaxdt, Bull. Soc. Imp6r. des Natur. de Moscou, VI, 1833, p. 172. 

 Ligia dilatata Stimpson, Boa. Journ. Nat. Hist., 1857, p. 67, pi. xxii, fig. 8. — 



S. I. S.MiTn, Report of Progress of Geological Survey of Canada, 1878-79. 

 Ligia Heptentrioualis Lockincton, Proc. Cal. Acad. Sci., VII, 1877, Pt. 1, p. 46. 

 Ligia Hiimpsoni MiERS, Proc. Zool. Soc, 1877, p. 671 (see footnote). 

 Ligia paUasli Budde-Lund, Crust. Isop. Terrestria, 1885, pp. 261, 262. 



Habitat. — Unalaska; Sitka; Tanager, Aleutian Islands; Victoria, 

 Vancouver Island; Pu get Sound; California. 



84. LIGIA EXOTICA Roux. 



Ligia exotica Roux, Crust. Mddit., p. 3, pi. xiii, fig. 9. 



Ligia grandis Perty, Spix. H. Martins, p. 212, pi. xl, fig, 13. 



Ligia gaudichaiidii Milne-Edwards, Hist. Nat. des Crust,, III, p. 157. 



Ligia handiniana Milne-Edwards, Hist.' Nat. des Crust,, III, p. 155. 



Ligia (Italica') coriacea Koch, Dentschl. Crust., p. 36; Berichtig., p. 211. 



Ligia gaudichaudii Dana, Exi)1. Exp., p. 741, pi. xlix, figs. 6a-h. — Nicolet, Gay, 



Hist. Chile, III, p. 265. 

 Ligia handiniana Miers, Proc. Zool. Soc, 1877, p. 670. 

 Ligia exotica Budde-Lund, Cru.st. iBop. Terrestria, 1885, pp. 266-268. 



Habitat. — Widely distributed ; California ; Topolobampo, Mexico (Mr. 

 Edward Palmer). 



33. LIGIDIUM Brandt. 



analytical key to the species of LIGIDIUM. 



a. Inner process of the basal article of the nropoda three times shorter than the 

 terminal external branch ; internal terminal branch reaching the apex of tlie 

 external branch ; the two terminal hairs equal in length to the external branch. 



85. IJgidiinn hi/pnoriivi (Cuvier). 



a'. Inner process of the basal article of the uropoda four times shorter than the 



terminal external branch; internal terminal branch long, extending much 



beyond the apex of the external branch, being a sixth part longer; the two 



terminal hairs short, ecjual in length to halt' the external branch. 



86. Ligidium tenue Budde-Lund. 



