No. 399-.] WORTH-AMERICAN INVERTEBRATES. 221 
y Q7 FINE 7, — 1 
Fic. 6.— Rocinela belliceps. — F1G. 7. — Anilocra occidentalis. Fic. 8. 7; 
of the segments. Branches of the uropoda much shorter than termi- 
nal segment. . . . . Anilocra laticauda Milne Edwards, M.S 
Genus Olencira Leach. . . . . Olencira pregustator (Latrobe), MSG 
Genus Ceratothoa Dana. . . > . - . Ceratothoa linearis Dana, M 
Genus Meinertia Stebbing. Meinertia transversa Richardson, G, 347 fms. 
Genus Cymothoa Fabricius. 
a. Terminal segment lanceolate. . . - Cymothoa lanceolata Say, M 
a’. Terminal segment transverse ; posterior margin widely sinuated or 
bilobed. 
à. Anterior angles of the first thoracic segment short, acute ; sides 
of the segment a little constricted. Inner branch of the 
uropoda much shorter than outer branch. 
Cymothoa excisa Perty, MSG 
3’. Anterior angles of the first thoracic segment very large, equaling 
or surpassing the front of the head, rounded. Sides of the 
segment flexuous. Inner branch of the uropoda manifestly 
longer than outer branch. . . Cymothoa astrum (Linn), M 
Genus Livoneca Leach. ; i 
a. Abdomen immersed in thorax, the sides of the first segment being 
almost entirely covered by the seventh thoracic segment. ` 
b. Head narrowly rounded in front. 
Livoneca californica Schicedte and Meinert, PD 
8’. Head broad, roundly truncate in front. 
Livoneca vulgaris Stimpson, D 
a’. Abdomen not immersed in thorax, the sides of the first segment free. 
à. Uropoda much longer than caudal segment ; inner branch 
narrow, obtuse, much shorter than outer branch. Epimera - 
of last two thoracic segments not longer than segments. 
Livoneca redmanni Leach, SG 
