574 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



73. ARMADILLIDIUM Brandt. 



174. ARMADILLIDIUM VULGARE (Latreille). 



Armadillo vulgare Latreille, Hist. Crust., VII, p. 48; Gen. CVust., I, p. 71. 

 Armadillo pilularis Say, Jour. Ac. Nat. Sci. Phila., 1, 1818, p. 432, 438. 

 ArmadilUdium commutaturn Brandt and Ratzeburg, Med. Zool., II, }). SI, pi. xiii, 



figs. 1, 2, 3, A, B. 

 Armadillo trivialis Koch, Deuts(;hl. Crust., p. 28. 

 Armadillo alter Schnitzler, De Onisc, p. 26. 



Armadillidiwn vidgure Budde-Lund, 1885, pp. 66-68 (see Budde-Lund for synon- 

 ymy)- 

 Habitat. — Distribution world-wide. 



Family XXI. LIGHD^. 



74. LIGIA Fabricius. 



Both branches of uropoda equal in length, styliform, often filiform. 

 Interior mala of the mandibles with numerous penicils. Last segment 

 of body broad, with distinct epimeral plates. Maxillipeds with palp 

 four to five jointed; epignath rounded. 



ANALYTICAL KEY TO THE SPECIES OF LIGIA. 



a. External antennae shorter than body. 



^>. Uropoda nearly equal to one-third length of body. 



175. Ligia oceanica (Linnaeus). 

 I/. Uropoda equal to half the length of body. 



176. Ligia haudiniana Milne-Edwards. 

 a\ External antennae longer than body. Caudal stylets about equal to t\A-o-thirds 

 length of body. 

 /). Tarsus of first pair of feet in the males with a compressed process at apex. 



177. Ligia exotica Roux. 

 b\ Tarsus of first pair of feet in males without comjjresse'd process at apex, simple. 



178. Ligia olfersii Brandt. 



175. LIGIA OCEANICA (Linnaeus). 



Oniscus oceanicus Linn^us, Syst. Nat., 12th ed., II, p. 1061; 13th ed., I, Pt. 5, 



p. 3012. 

 Cymothoa oceanica Fabricius, Mantissa, I, p. 242. 

 Ligia oceanica Fabricius, Suppl. Ent. Syst., p. 301. 

 itgria orttsadss Brebisson, Mem. Soc. Lin. Calv., 1825, p. 259. 

 iig^m ocmnico Budde-Lund, Crust. Isop. Terrestria, 1885, pp. 259-261. 



Habitat.- — Off Newport, Rhode Island; North Sea; Baltic Sea; Kat- 

 tegat Sea; Norway; F8er0e Islands; coast of Germany; Belgium; 

 Great Britain; France; Spain; Mediterranean Sea. 



Depth . — Littoral . 



176. LIGIA BAUDINIANA Milne-Edwards. 



Ligia hmuliiuava Milne-Edwards, Hist, des Crust., Ill, 1840, pp. 155, 156. — 



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

 Ligia baudiana Ives, Proc. Ac. Nat. Sci. Phila., 1891, pp. 185-186, i)l. vi, fig. 2. 



