Pacijic Coast of North America. 161 



u'outh-organs, the inner upper margin 

 and apex never setose, the apex and 

 sometimes the inner upper margin, at 

 least ill 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. Maxillipeds commonly seven- 

 jointed, sometimes four-jointed, the 

 last joint in the latter case rather short, 

 obtuse. Antennae * long, unequal, 

 with well-detined peduucle and fla- 



gellum V. Moir<M. 



d' . Mandibles with no secondary plate ; 

 the palp in adults with first joint or 

 both first and second joints inflated. 

 Maxillipeds always four-jointed, last 

 joint rather long and narrow, subacute. 

 Antennae * much reduced, without 

 clear distinction between peduncle and 



fla^ellum VI. Cymothoidje. 



I. Pleon consisting of less than six segments. 

 b. Pleon with two segments. Uropoda with 



one branch flxed, immovable \ll. Sphjeromid^. 



b'. Pleon with four segments. Uropoda with 



both branches movable VIII. SEROLiD.a?, 



Family II. Limnoriidae. 

 2. LiMNORiA, Leach. 



3. Limnoria Uynorum (Rathke). 



Cymothoa lignonon, Rathke, Skrivt. af Naturh. Selsk. v. 1799, p. 101, 



pi. iii. fig. 14 (White). 

 Limnoi-ia tenebrans, Leach, Ed. Encycl. vii. 1813, p. 433 (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, 

 Regne 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 iiynorum, "^^'hite, Pop. Hist. Brit. Crust. 1857, p. 227, pi. xii. 

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

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

 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 Fisheries, 1874, pt. i. p. 571 

 (277), pi. vi. tig. 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, 

 tig. 2. 



* Inserted by author. 



