ISOPODS OF NORTH AMERICA. 269 



> LIMNORIA LIGNORUM (Rathke). 



Cyinothoa lic/norum Rati ike, Skrivt. af Natur. Selsk., V, 1799, p. 101, pi. iii, 

 fig. 14. 



Limnoria (enehrnns Leach, Edinb. Eucycl., VII, 1813, p. 433 (Am. ed., p. 273); 

 Trans. Linn. Soc. London, XI, 1815, p. 37; Diet. Sci. Nat., XII, 1818, p. 

 353. — Desmarest, Consid. ir6n. Crust., 1825, p. 312. — Latkeille, Regne 

 Anim., IV, 1829, p. 135. — Edwards, Annot. de Laman^k, V, 1838, p. 276; 

 Hist. Nat. Crust.*, Ill, 1840, p. 145.— Gould, Invert. Mass., 1841, i)p. 338, 

 354. — Edwards, Regne Anim. Crust., 1849, p. 197, pi. iavii, fig. 5. 



Limnoria lignorum White, Pop. Hist. Brit. Crust., 1857, p. 227, pi. xii, fig. 5. — ■ 

 Bate, Report Brit. Assoc, 1861, p. 225. 



Limnoria uncinata Heller, Verh. k. k. Zool. Bot. Ges. Wien, XVI, 1866, p. 734. 



Limnoria lignorum Bate and Westwood, British Sessile-eyed Crust., II, 186S, 

 p. 351.— Norman, Report British Assoc, 1869, p. 288. 



Limnoria tenehrans Verkill, Proc Am. Assoc. Adv. Sci., 1874, p. 367. 



Limnoria calif ornica Hewstox, Proc. Cal. Acad. Sci., V, 1874, p. 24 (nomen 

 nudum ) . 



Limnoria lignorum Verrill, Am. Jour. Sci., VII, 1874, pjj. 133-135; Proc Am. 

 Assoc, 1874, p. 371. — Harger with Verrill, Report U. S. Commissioner of 

 Fish and Fisheries, Pt. 1, 1873, p. 379 (85), p. 571 (277), pi. vi, fig. 25.— 

 Stebbing, Trans. Devon. Assoc, 1874, p. 8; Ann. Mag. Nat. Hist. (4), XVII, 

 1876, p. 79.— Harger, Proc. U. S. Nat. Mus., II, 1879, p. 161.— Smith, Proc 

 U. S. Nat. Mus., II, 1879, p. 232, fig. 2.— Harger, Report U. S. Commissioner 

 of Fish and Fisheries, Pt. 6, 1880, pp. 373-376 (See Harger for synonymy). — 

 Richardson, Proc. U. S. Nat. Mus., XXI, 1899, pp. 821-822; Ann. Mag. Nat. 

 Hist. (7), IV, 1899, pp. 161-162.— Sars, Crust, of Norway, II, 1899, pp. 76-77, 

 pi. XXXI. — Richardson, American Naturalist, XXXIV, 1900, p. 222; Proc 

 U. S. Nat. Mus., XXIII, 1901, p. 532. 



Localities. — From Florida to Halifax and Gulf of St. Lawrence; 

 Pacitic Ocean; San Diego, California; also coast of Great Britain; 

 Kielerbncht, Germany; North Sea; Adriatic 

 Sea; coast of Norway; Bering- Island; Woods 

 Hole, Massachusetts. 



This species is destructive to wood and sub- 

 merged timber, boring holes which causes its 

 decay. 



Body oblong-ovate, twice as long as wide, li 

 mm. : 3 mm. 



Head wider than long, about twice as wide, 

 with the anterior margin slightly excavate. 

 Eyes small, distinct, and situated at the sides of 

 the head. The first pair of antenna^ have the first 

 two articles subequal; the third is a little longer 



,1,1 J iU i! ii ii A. li 11 -• Fig. 279.— Limnoria i.igko- 



than the second; the fourth or nrst iiagellar arti- ^^^^ (after harger) 

 cle is half as long as the third; the tiftli or second 



flagellar article is minute. The first antennc\» extend to the end of the 

 fourth article of the second pair of antenna^. The second pair of 

 antenna' have the first article large; the second is mt as long as the 

 first; the third and fourth are subequal and each is about as long as the 



