334 Miss H. Richardson on the Isopods of the 



pencils of haivs. Last segment of body broad, with 

 distinct epimeral plates. Maxillipeds with palp 



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



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 liairs. Last segment of body 

 small and without any epimeral pktes. Maxilli- 

 peds with a five-jointed palp ; epignath narrow, 



linguiform 35. Ligidium. 



b'. Extremity of uropods not furnished with two 



long apical bristles 36. Styloniscus. 



34. LiGiA, Fabricius. 



Analytical Key to the Species o/ Ligia. 



a. External antennfe shorter than the body. 

 b. Caudal stylets about equal to half the 



length of body 82. i. ocddentalis, 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 ocddentalis, Dana. 



Liffia ocddentalis, Dana, U.S. Expl. Exp., Crust, ii. p. 742, pi. xlix. 

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

 Joum. 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. 



Lif/ia Pallasii, Brandt, Bull. Soc. Imp^r. des Natur, de Moscou, vi. 



1833, p. 172. 

 Liffia dilatata, 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 Stimpsoni, Miers, Proc. Zool. Soc. 1877, p. 671 (see footnote). 

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



Hah. Unalaska ; Sitka ; Tanager, Aleutian Islands ; Vic- 

 toria, Vancouver Island ; Puget Sound ; California. 



