834 Miss H. Richardson on the Isopods of the 



pencils of hairs. Last segmeut of body broad, witli 

 distinct epimeral plates. Maxillipeds with palp 



four- to five-jointed ; epignath rounded 34. Ligxa. 



a'. Uropoda unequal in length. 



b. Extremity of uropods furnished with two long 

 apical bristles. Interior mala of right mandible 

 with three pencils of hairs, of left mandible with 

 five pencils of jiairs. Last segmtnt of body 

 small and without any epimeral plates. Maxilli- 

 peds with a five-jointed palp ; epignath narrow, 



linguif orm 35. Ligidium. 



b'. Extremity of uropods not furnished with two 



long apical bristles 38. Stijloniscus, 



34. LiGiA, Fabricius. 



Analytical Key to the Species o/Ligia. 



a. External antennae shorter than the body. 

 b. Caudal stylets about equal to half the 



length of body 82. i. occidentalis, Dana. 



b' . Caudal stylets about equal to one fifth 



the length of body 83. i. Pallasii, Brandt. 



a , External antennae longer than body or 

 equal to length of body. Caudal stylets 

 about equal to two thirds length of 

 body 84. L. exotica, Roux. 



82. Ligia occidentalism Dana. 



Ligia occidentalis, Dana, U.S. Expl. Exp., Crust, ii. p. 742, pi. xlix. 

 fig. 7 ; Proc. Acad. Nat. Sci. Philad. vii. p. 176; Stimpson, Bost. 

 Journ. Nat. Hist. vi. 1857, p. 66 ; Harford, Proc. Cal. Acad. Sci. 

 vii. 1877, p. 116 ; Budde-Lund, Crust. Isop. Terrestria, 1885, p. 264. 



Hah. California : San Francisco Bay ; San Diego ; Sacra- 

 mento River ; Monterey Bay ; Lower California. 



83, Ligia Pallasii^ Brandt. 



Liqia Pallasii, Brandt, Bull. Soc. Inip^r. des Natur. de Moscou, vi. 



1833, p. 172. 

 Ligia (hlatata, Stimpson, Bost. Journ. Nat. Hist. 1857, p. 67, pi. xxii. 



fig. 8 ; S. I. Smith, Report of Progress of Geological Survey of 



Canada, 1878-79. 

 Ligia septentrionalis, Lockington, Proc. Cal. Acad. Sci. vii. 1877, pt. 1, 



p. 46. 

 Ligia Stijnpsoni, Miers, Proc. Zool. Soc. 1877, p. 671 (see footnote). 

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



Jlob. Unalaska ; Sitka ; Tanagcr, Aleutian Islands ; Vic- 

 toria, Vancouver Island ; Puget Sound ; California. 



