Pacific Coast of North America. 161 



mouth-organs, the inner upper margin 

 and apex never setose, the apex and 



sometimes the inner upper margin, at • 



least iu the males and females without 

 eggs, being furnished with outward 

 curved hooks. 

 d. Mandibles with the secondary plate very 

 often visible ; palp with no inflated 

 joint. Maxiliipeds commonly seven- 

 jointed, sometimes four-jointed, the 

 last joint in the latter case rather short, 

 obtuse. Antennae * long, unequal, 

 with well-dehned peduncle and fla- 



gellum V. MaiviM. 



d'. Mandibles with no secondary plate ; 

 the palp in adults with first joint or 

 both first and second joints inflated. 

 Maxiliipeds always four-jointed, last 

 joint rather long and narrow, subacute. 

 Antennae * much reduced, without 

 clear distinction between peduncle and 



flagellum VI. CYMOTHOiD.a:. 



:'. Pleon consisting of less than six segments. 

 b. Pleon with two segments. Uropoda with 



one branch fixed, immovable VII. Sph^romid.^. 



b'. Pleon with four segments. Uropoda with 



both branches movable VIII. Serolid^. 



Family II. Limnoriidae. 



2. LiMNORiA, Leach. 



3. Limnoria li(/Horum (Rathke). 



Cyynothoa lignoru7n, Rathke, Skrivt. af Naturh. Selsk. v. 1799, p. 101, 

 pi. iii. fig. 14 (White). 



Limnoria tenebrans, Leach, Ed. Encycl. vii. 1813, p. 4-33 (Am. ed. 

 p. 273); Trans. Linn. Soc. xi. 1815, p. 371; Diet. Sci. Nat. xii. 

 1818, p. 353; Desmarest, Consid. Crust. 1825, p. 312; Latreille, 

 Reo-ne Anim. iv. 1829, p. 135 ; Edwards, Anuot. de Lamarck, 

 V. 1838, p. 276; Hist. Nat. des Crust, iii. 1840, p. 145; Regne 

 Anim., Crust. 1849, p. 197, pi. Ixvii. fig. 5 ; Gould, Invert. Mass. 

 1840, pp. 338-354; Verrill, Proc. Am. Assoc. 1873 (1874), p. 367. 



Limnoria lignorum, White, Pop. Hist. Brit. Crust. 1857, p. 227, pi. xii. 

 fig. 5; Bate, Rep. Brit. Assoc. 1860 (1861), p. 225 ; Bate & West- 

 wood, Brit. Sess. Crust, ii. 1868, p. 351 ; Norman, Rep. Brit. Assoc. 

 1868 (1869), p. 288; Verrill, Am. Journ. Sci. 3rd ser., vii. 1874, 

 pp. 133, 135; Proc. Am. Assoc. 1873 (1874), p. 371 ; Report U.S. 

 Commissioner of Fish and Fisheries, 1874, pt. i. p. 379 (85) ; Harger, 

 Report U.S. Commissioner of Fish and Ksheries, 1874, pt. i. p. 571 

 (277), pi. vi. fig. 25 ; Proc. U.S. Nat. Mus. ii. 1879, p. 161 ; Stebbing, 

 Trans. Devon. Assoc. 1874, p. 8; Ann. & Mag. Nat. Hist. ser. 4, 

 xvii. 1876, p. 79 ; Smith, Proc. U.S. Nat. Mus. ii. 1879 (1880), p. 232, 

 tiff. 2. 



* Inserted by author. 



