CRUSTACEA. 47 



ARTHROSTRACA. ISOPODA. 



ARMADILLIDIDAE. 



Sow-bugs ; Pill-bugs ; Wood-lice. 



142. Armadillidium vulgaee (Latreille). 



Armadillo vulgare Latreille, Hist. nat. Crust. Ins., an XII 

 (1804), vol. 7, p. 48. "Il est tres-commun." 



Arraadillidiiim commutatwm Brandt & Ratzeburg, Med. zool., 

 Berlin, 1833, vol. 2, p. 81, pi. 13, figs. 1, 2, 3, A,'B. 



Under boards and stones, in gardens and cellars. 



Mass. 



R. I. — Providence. 



LIGYDIDAE. 



143. LiGYDA ocEANicA (Linne). 



Oniscus oceanicus Linne, Syst. nat., ed. 12, 1767, vol. 1, pt. 2, 

 p. 1061. "Habitat in Oceano." 



Ligia oceanica Kinahan, Nat. hist, rev., 1857, vol. 4, p. 279, 

 pi. 20, figs. 7-10. 



R. I. — OfE Newport. 



TRICHONISCIDAE. 



144. AcTONiscus ELLiPTicus Harger. 



Actoniscus ellipticics Harger, Amer. journ. sci., 1878 (3), vol. 

 15, p. 373. "at Savin Rook, near New Haven, and also at 

 Stony Creek." Rept. U. S. commr. of fish & fisheries, pt. 6, 

 for 1878 (1880), p. 309, pi. 1, fig. 3. 



Conn. — Savin Rock &, Stony Creek. 



145. SCYPHACELLA ARENICOLA Smith. 



Scyphacella arenicola Smith, Rept. U. S. commr. of fish &, 

 fisheries, pt. 1, for 1871-1872 (1873), p. 568 [274]. "Somers's 



